:root {
      color-scheme: light;
      --ink: #20262e;
      --muted: #64707d;
      --line: #d8e0e8;
      --paper: #ffffff;
      --soft: #f3f6f8;
      --accent: #0f766e;
      --accent-2: #b45309;
      --blue: #2057b8;
      --code: #16212d;
      --warn: #a43f12;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: "Segoe UI", "Noto Sans KR", "Apple SD Gothic Neo", Arial, sans-serif;
      color: var(--ink);
      background: var(--soft);
      line-height: 1.62;
      overflow-x: hidden;
    }
    a { color: inherit; }
    .shell { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 18px; }
    header { background: var(--paper); border-bottom: 1px solid var(--line); }
    .topbar { padding: 18px 0; display: flex; gap: 14px; justify-content: space-between; align-items: center; }
    .brand { text-decoration: none; font-weight: 800; font-size: 18px; }
    .back { color: var(--blue); text-decoration: none; font-weight: 700; }
    .hero { padding: 28px 0 34px; }
    .eyebrow { margin: 0 0 6px; color: var(--accent); font-size: 12px; font-weight: 800; text-transform: uppercase; }
    h1, h2, h3, h4 { margin: 0; letter-spacing: 0; overflow-wrap: anywhere; word-break: break-word; }
    h1 { max-width: 860px; font-size: clamp(30px, 4vw, 46px); line-height: 1.12; }
    h2 { font-size: 22px; margin-bottom: 14px; }
    h3 { font-size: 18px; }
    h4 { font-size: 14px; margin-top: 18px; }
    p { margin: 9px 0 0; color: var(--muted); overflow-wrap: anywhere; }
    main { padding: 28px 0 56px; }
    .band { margin-top: 28px; }
    .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
    .section-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
    .route-grid, .schema-grid, .visual-grid, .mock-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 14px; }
    .panel, .section-card, .concept, .topic-card {
      background: var(--paper);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 20px;
    }
    .route-card {
      background: var(--paper);
      border: 1px solid var(--line);
      border-left: 4px solid var(--accent);
      border-radius: 8px;
      padding: 16px;
    }
    .visual-card, .mock-card {
      background: var(--paper);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 16px;
      display: grid;
      gap: 12px;
    }
    .visual-card h3 a { color: var(--ink); text-decoration-thickness: 2px; text-underline-offset: 3px; }
    .scan-flow {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(88px, 1fr));
      gap: 8px;
      margin: 0;
      padding: 0;
      list-style: none;
      counter-reset: scan;
    }
    .scan-flow li {
      min-height: 58px;
      border: 1px solid #c8d6df;
      border-radius: 6px;
      background: #f8fafc;
      padding: 24px 8px 8px;
      position: relative;
      font-size: 12px;
      font-weight: 800;
      line-height: 1.28;
      overflow-wrap: anywhere;
    }
    .scan-flow li::before {
      counter-increment: scan;
      content: counter(scan);
      position: absolute;
      top: 7px;
      left: 8px;
      width: 17px;
      height: 17px;
      border-radius: 50%;
      background: var(--blue);
      color: #fff;
      display: grid;
      place-items: center;
      font-size: 10px;
    }
    .scan-checks {
      margin: 0;
      padding-left: 18px;
      color: var(--muted);
      font-size: 13px;
    }
    .mock-card { border-left: 4px solid var(--accent-2); }
    .mock-card details { border-top: 1px solid var(--line); padding-top: 8px; }
    .section-card { display: flex; min-height: 230px; flex-direction: column; gap: 12px; }
    .section-card p { flex: 1; }
    .meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; max-width: 100%; min-width: 0; }
    .keyword-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 12px;
      margin-top: 12px;
    }
    .keyword-card {
      border: 1px solid #d8e0e8;
      border-radius: 8px;
      background: #fbfcfd;
      padding: 12px;
    }
    .keyword-card strong {
      display: block;
      color: var(--ink);
      margin-bottom: 5px;
      font-size: 14px;
    }
    .keyword-card p {
      margin: 0;
      color: var(--muted);
      font-size: 13px;
    }
    .pill {
      display: inline-flex;
      align-items: center;
      min-height: 28px;
      max-width: 100%;
      border: 1px solid #c9d9ff;
      border-radius: 999px;
      background: #eef4ff;
      color: #1d4d91;
      padding: 4px 10px;
      font-size: 12px;
      font-weight: 700;
      text-decoration: none;
      white-space: normal;
      overflow-wrap: anywhere;
    }
    .button {
      display: inline-flex;
      justify-content: center;
      align-items: center;
      min-height: 38px;
      border-radius: 6px;
      background: var(--accent);
      color: white;
      padding: 8px 12px;
      text-decoration: none;
      font-weight: 800;
    }
    .stats { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
    .stat { background: var(--soft); border: 1px solid var(--line); border-radius: 6px; padding: 10px 12px; min-width: 132px; }
    .stat strong { display: block; font-size: 22px; color: var(--ink); }
    ul, ol { margin: 10px 0 0; padding-left: 20px; }
    li { margin: 7px 0; }
    li, td, th { overflow-wrap: anywhere; }
    code, .prompt-box, .profile { font-family: Consolas, "SFMono-Regular", "Noto Sans Mono CJK KR", monospace; }
    code { font-size: 0.92em; }
    .concept { margin-top: 20px; }
    .concept-head { border-bottom: 1px solid var(--line); padding-bottom: 12px; margin-bottom: 14px; }
    .lead { color: var(--ink); font-weight: 700; }
    .analogy { background: #fff8ed; border-left: 4px solid var(--accent-2); padding: 12px 14px; border-radius: 6px; color: #533612; }
    .formula { margin-top: 14px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 6px; background: #f8fafc; overflow-x: auto; color: #6d45a8; }
    .beginner-bridge {
      margin-top: 14px;
      border: 1px solid #c9d9ff;
      border-left: 4px solid var(--blue);
      border-radius: 8px;
      background: #f8fbff;
      padding: 14px;
    }
    .bridge-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
      gap: 10px;
      margin-top: 8px;
    }
    .bridge-grid > div {
      border: 1px solid #d8e0e8;
      border-radius: 6px;
      background: white;
      padding: 12px;
    }
    .bridge-grid strong {
      display: block;
      color: var(--ink);
      margin-bottom: 4px;
      font-size: 13px;
    }
    .bridge-grid p {
      margin: 0;
      font-size: 14px;
      color: var(--muted);
    }
    .mini-lesson, .trap-list { margin-top: 14px; border: 1px solid var(--line); border-radius: 6px; padding: 12px 14px; background: #fbfcfd; }
    .trap-list { border-left: 4px solid var(--warn); background: #fff7f1; }
    .lecture-flow { margin-top: 20px; display: grid; gap: 18px; }
    .lecture-block { border-top: 1px solid var(--line); padding-top: 16px; }
    .lecture-block:first-child { border-top: 0; padding-top: 0; }
    .lecture-block h3 { font-size: 17px; margin-bottom: 8px; }
    .lecture-block p { max-width: 920px; }
    .lecture-block ol, .lecture-block ul { margin-top: 8px; }
    .lecture-block li { margin: 8px 0; }
    .answer-frame {
      margin-top: 10px;
      border-left: 4px solid var(--accent);
      background: #effaf4;
      border-radius: 6px;
      padding: 12px 14px;
    }
    .trap-note {
      margin-top: 10px;
      border-left: 4px solid var(--warn);
      background: #fff7f1;
      border-radius: 6px;
      padding: 12px 14px;
    }
    .flow-visual { display: grid; grid-template-columns: repeat(auto-fit, minmax(116px, 1fr)); gap: 10px; list-style: none; padding: 0; margin: 14px 0 0; counter-reset: step; }
    .flow-visual li { min-height: 64px; border: 1px solid var(--line); border-radius: 6px; padding: 30px 10px 9px; background: linear-gradient(180deg, #ffffff, #eef8f6); position: relative; font-size: 13px; }
    .flow-visual li::before { counter-increment: step; content: counter(step); position: absolute; top: 8px; left: 10px; width: 21px; height: 21px; border-radius: 50%; background: var(--accent); color: white; display: grid; place-items: center; font-size: 12px; }
    .protocol-visual { margin-top: 14px; display: grid; gap: 12px; }
    .lane-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(128px, 1fr)); gap: 10px; }
    .lane-grid span { border: 1px solid #bdd8d3; border-radius: 6px; background: #eef8f6; padding: 10px; min-height: 46px; font-weight: 800; color: #17443e; display: grid; place-items: center; text-align: center; }
    .packet-table { width: 100%; border-collapse: collapse; table-layout: fixed; font-size: 12px; background: #fff; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
    .packet-table th, .packet-table td { border: 1px solid var(--line); padding: 9px; vertical-align: top; overflow-wrap: anywhere; }
    .packet-table th { background: #eef4ff; color: #183b73; text-align: left; }
    .as-map { display: grid; grid-template-columns: minmax(82px, 1fr) minmax(120px, 1.3fr) minmax(82px, 1fr) minmax(120px, 1.3fr) minmax(82px, 1fr); gap: 8px; }
    .as-node, .as-edge { border: 1px solid var(--line); border-radius: 6px; min-height: 64px; padding: 8px; display: grid; place-items: center; text-align: center; background: #fbfcfd; font-weight: 800; }
    .as-node small { color: var(--muted); font-weight: 500; }
    .as-node.honest { background: #effaf4; border-color: #b7dfc7; }
    .as-node.attacker, .as-edge.attack { background: #fff7f1; border-color: #efc5ac; color: #71310f; }
    .as-edge { color: #183b73; font-size: 12px; }
    .block-visual { display: grid; grid-template-columns: repeat(4, minmax(44px, 1fr)); gap: 8px; margin-top: 14px; }
    .block-visual span { min-height: 46px; border: 1px solid var(--line); border-radius: 6px; display: grid; place-items: center; background: #d9f2ee; font-weight: 800; }
    .block-visual b { grid-column: 1 / -1; font-size: 13px; color: var(--warn); }
    .prompt-box { margin-top: 10px; background: var(--code); color: #eef5f8; border-radius: 6px; padding: 14px; font-size: 13px; white-space: pre-wrap; overflow-x: auto; }
    .practice-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
    .practice-grid > div { border: 1px solid var(--line); border-radius: 6px; padding: 12px; background: #fbfcfd; }
    .practice-grid h4 { margin-bottom: 6px; font-size: 14px; }
    .signal { display: inline-block; margin-left: 8px; border-radius: 999px; padding: 3px 8px; font-size: 12px; font-weight: 800; }
    .signal-high { background: #fce8e1; color: #8f2d18; }
    .signal-medium { background: #fff4cf; color: #745400; }
    .signal-supporting { background: #e8f2ff; color: #1c4f82; }
    .source-list, .topic-card ul { font-size: 13px; color: var(--muted); }
    .source-list span, .topic-card span { color: var(--blue); }
    details { margin-top: 12px; }
    summary { cursor: pointer; color: var(--blue); font-weight: 800; }
    .commands pre, .profile { overflow-x: auto; white-space: pre-wrap; }
    .commands pre { background: var(--code); color: #eef5f8; padding: 16px; border-radius: 8px; }
    .schema-grid pre { background: var(--code); color: #eef5f8; padding: 14px; border-radius: 6px; white-space: pre-wrap; overflow-x: auto; }
    .notice { border-left: 4px solid #23714d; background: #effaf4; color: #183f2b; padding: 12px 14px; border-radius: 6px; }
    .interactive-widget {
      margin-top: 16px;
      border: 1px solid #c9d9ff;
      border-left: 4px solid var(--blue);
      border-radius: 8px;
      background: #f8fbff;
      padding: 14px;
      display: grid;
      gap: 12px;
    }
    .interactive-widget h4 { margin-top: 0; font-size: 16px; }
    .interactive-stage {
      display: grid;
      grid-template-columns: minmax(90px, 1fr) auto minmax(90px, 1fr) auto minmax(90px, 1fr);
      align-items: stretch;
      gap: 8px;
    }
    .state-card, .state-arrow {
      border: 1px solid var(--line);
      border-radius: 6px;
      min-height: 48px;
      padding: 8px;
      display: grid;
      place-items: center;
      text-align: center;
      font-size: 12px;
      font-weight: 800;
      background: white;
      color: var(--ink);
    }
    .state-arrow {
      min-width: 42px;
      background: #eef4ff;
      color: #1d4d91;
    }
    .control-row {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .control-row button {
      border: 1px solid #b9cdf8;
      border-radius: 6px;
      background: #fff;
      color: #183b73;
      padding: 8px 10px;
      font-weight: 800;
      cursor: pointer;
      text-align: left;
      min-height: 36px;
      overflow-wrap: anywhere;
    }
    .control-row button:hover, .control-row button.is-active {
      background: #2057b8;
      color: white;
      border-color: #2057b8;
    }
    .interactive-output {
      margin: 0;
      border-radius: 6px;
      background: #effaf4;
      border-left: 4px solid var(--accent);
      padding: 10px 12px;
      color: #183f2b;
      font-weight: 700;
    }
    .audit-frame, .block-strip {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
      gap: 8px;
    }
    .audit-frame span, .block-strip span {
      border: 1px solid #bdd8d3;
      border-radius: 6px;
      background: #eef8f6;
      padding: 9px;
      min-height: 42px;
      display: grid;
      place-items: center;
      text-align: center;
      font-weight: 800;
      font-size: 12px;
      color: #17443e;
    }
    .scored-check {
      margin-top: 14px;
      border: 1px solid #d8e0e8;
      border-left: 4px solid var(--accent);
      border-radius: 8px;
      background: #fbfffc;
      padding: 14px;
      display: grid;
      gap: 12px;
    }
    .scored-check h4 { margin-top: 0; font-size: 16px; }
    .score-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 8px;
    }
    .score-item {
      display: grid;
      grid-template-columns: 20px 1fr;
      gap: 8px;
      align-items: start;
      border: 1px solid var(--line);
      border-radius: 6px;
      background: white;
      padding: 10px;
      font-size: 13px;
      color: var(--ink);
    }
    .score-item input {
      margin-top: 3px;
      width: 16px;
      height: 16px;
      accent-color: var(--accent);
    }
    .score-output {
      margin: 0;
      border-radius: 6px;
      background: #effaf4;
      border-left: 4px solid var(--accent);
      padding: 10px 12px;
      color: #183f2b;
      font-weight: 800;
    }
    .score-output.score-low {
      background: #fff7f1;
      border-left-color: var(--warn);
      color: #71310f;
    }
    .score-output.score-mid {
      background: #fff8df;
      border-left-color: var(--accent-2);
      color: #5d4300;
    }
    .recall-hero .meta { margin-top: 14px; }
    .recall-section { scroll-margin-top: 18px; }
    .recall-list {
      display: grid;
      gap: 16px;
      margin-top: 16px;
    }
    .recall-item {
      border: 1px solid var(--line);
      border-left: 4px solid var(--accent);
      border-radius: 8px;
      background: var(--paper);
      padding: 18px;
      overflow: hidden;
    }
    .recall-item h3 { margin-bottom: 8px; }
    .recall-block {
      margin-top: 14px;
      border-top: 1px solid var(--line);
      padding-top: 12px;
    }
    .recall-block h4, .recall-detail summary, .recall-answer summary {
      font-size: 14px;
      color: var(--blue);
      font-weight: 800;
    }
    .recall-answer {
      margin-top: 14px;
      border: 1px solid #d8e0e8;
      border-radius: 8px;
      background: #fbfcfd;
      padding: 12px;
    }
    .recall-detail {
      margin-top: 12px;
      border-left: 3px solid #c9d9ff;
      padding-left: 12px;
    }
    .recall-kv {
      display: grid;
      grid-template-columns: minmax(130px, 0.25fr) 1fr;
      gap: 10px;
      border-top: 1px solid var(--line);
      padding: 8px 0;
    }
    .recall-kv:first-child { border-top: 0; }
    .recall-kv > strong {
      color: var(--blue);
      overflow-wrap: anywhere;
    }
    .beginner-longform {
      margin-top: 18px;
      border: 1px solid #d9e3ea;
      border-left: 4px solid var(--accent);
      border-radius: 10px;
      background: #fff;
      padding: 0;
    }
    .beginner-longform > summary {
      cursor: pointer;
      padding: 15px 18px;
      list-style-position: inside;
    }
    .beginner-longform[open] > summary {
      border-bottom: 1px solid #e2e8ed;
      background: #f8fbfc;
    }
    .beginner-blog {
      max-width: 74ch;
      margin: 0 auto;
      padding: 26px 24px 34px;
      color: #243442;
    }
    .beginner-blog-header {
      padding-bottom: 22px;
      border-bottom: 2px solid #233f55;
    }
    .beginner-blog-header h2 {
      max-width: 24ch;
      margin: 5px 0 0;
      color: #172b3a;
      font-size: clamp(24px, 4vw, 34px);
      line-height: 1.25;
      letter-spacing: -0.025em;
      word-break: keep-all;
    }
    .beginner-blog-lead {
      margin: 18px 0 0;
      border-left: 4px solid #e8a33a;
      background: #fff8e9;
      padding: 14px 16px;
      color: #53340b;
      font-size: 16px;
      line-height: 1.75;
    }
    .beginner-blog-body { margin-top: 28px; }
    .beginner-blog-body > .beginner-blog-lead {
      margin-top: 0;
      margin-bottom: 34px;
    }
    .beginner-zero-primer {
      margin: 0 0 44px;
      padding-bottom: 38px;
      border-bottom: 2px solid #233f55;
    }
    .beginner-zero-primer-head {
      margin-bottom: 30px;
    }
    .beginner-zero-primer-head h3 {
      max-width: 28ch;
      margin: 6px 0 12px;
      color: #18384f;
      font-size: 24px;
      line-height: 1.4;
      word-break: keep-all;
    }
    .beginner-zero-primer-head > p:last-child {
      max-width: 62ch;
      margin: 0;
      color: #506472;
      font-size: 15px;
      line-height: 1.8;
    }
    .beginner-primer-concept {
      margin-top: 34px;
      padding-top: 28px;
      border-top: 1px solid #dce5ea;
    }
    .beginner-primer-number {
      margin: 0 0 5px !important;
      color: #317088;
      font-size: 12px !important;
      font-weight: 900;
      letter-spacing: 0.08em;
    }
    .beginner-primer-concept > h3 {
      margin: 0 0 12px;
      color: #172f40;
      font-size: 21px;
      line-height: 1.45;
      word-break: keep-all;
    }
    .beginner-primer-teacher {
      margin: 16px 0 22px;
      border-left: 4px solid #317088;
      padding: 4px 0 4px 18px;
    }
    .beginner-primer-teacher h4,
    .beginner-primer-subtitle,
    .beginner-primer-trap h4 {
      margin: 0 0 8px;
      color: #1f536a;
      font-size: 16px;
      line-height: 1.5;
    }
    .beginner-primer-teacher p {
      max-width: 68ch;
      margin: 7px 0 0;
      color: #3c5361;
      font-size: 15px;
      line-height: 1.85;
    }
    .beginner-primer-subtitle { margin-top: 24px; }
    .concept-diagram {
      max-width: 820px;
      margin: 24px 0 30px;
      border: 1px solid #d4ded8;
      border-radius: 11px;
      background: #fbfcfa;
      overflow: hidden;
      box-shadow: 0 8px 24px rgba(30, 53, 44, .055);
    }
    .concept-diagram iframe {
      display: block;
      width: 100%;
      aspect-ratio: 940 / 730;
      border: 0;
      background: #fbfcfa;
    }
    .concept-diagram figcaption {
      border-top: 1px solid #dfe6e2;
      padding: 13px 16px 15px;
      color: #43574e;
      font-size: 13px;
      line-height: 1.65;
    }
    .concept-diagram figcaption strong {
      display: block;
      margin-bottom: 3px;
      color: #214f43;
    }
    .concept-diagram figcaption span {
      display: block;
      margin-top: 5px;
      color: #75847d;
      font-size: 11px;
    }
    .concept-deep-link {
      display: inline-flex;
      width: fit-content;
      margin-top: 10px;
      border-radius: 7px;
      background: #245f52;
      padding: 9px 12px;
      color: white !important;
      font-size: 13px;
      font-weight: 850;
      text-decoration: none;
    }
    .concept-deep-link:hover { background: #17483e; }
    .concept-page-link { margin-top: 28px; }
    .deep-breadcrumb {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 24px 0 32px;
      color: #66766f;
      font-size: 13px;
    }
    .deep-breadcrumb a { color: #216254; }
    .mode-deep-page { max-width: 1040px; margin: 0 auto 80px; }
    .mode-deep-intro {
      border-bottom: 2px solid #244f45;
      padding: 12px 0 34px;
    }
    .mode-deep-intro h2 {
      max-width: 25ch;
      margin: 7px 0 14px;
      color: #173f36;
      font-size: clamp(30px, 4.5vw, 48px);
      line-height: 1.22;
      letter-spacing: -.035em;
      word-break: keep-all;
    }
    .mode-deep-intro > p:last-child {
      max-width: 72ch;
      margin: 0;
      color: #3c5047;
      font-size: 17px;
      line-height: 1.85;
    }
    .mode-jump {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 22px 0 0;
    }
    .mode-jump a {
      border: 1px solid #cfdbd5;
      border-radius: 999px;
      background: #fafbf9;
      padding: 8px 11px;
      color: #2e5d51;
      font-size: 12px;
      font-weight: 800;
      text-decoration: none;
    }
    .mode-lesson {
      display: grid;
      grid-template-columns: 54px minmax(0, 1fr);
      gap: 24px;
      border-top: 1px solid #d5ded9;
      padding: 54px 0 60px;
      scroll-margin-top: 18px;
    }
    .mode-lesson:first-of-type { margin-top: 42px; }
    .mode-step-number {
      margin: 6px 0 0;
      color: #799087;
      font: 800 13px/1.4 Consolas, monospace;
    }
    .mode-lesson h2,
    .mode-overview-diagram h2 {
      margin: 0 0 16px;
      color: #173f36;
      font-size: clamp(25px, 3vw, 34px);
      line-height: 1.32;
      letter-spacing: -.025em;
      word-break: keep-all;
    }
    .mode-lesson > div > p {
      max-width: 72ch;
      margin: 13px 0 0;
      color: #344a40;
      font-size: 16px;
      line-height: 1.9;
    }
    .term-ledger { margin: 25px 0 0; }
    .term-ledger > div {
      display: grid;
      grid-template-columns: 110px minmax(0, 1fr);
      gap: 18px;
      border-top: 1px solid #e0e6e2;
      padding: 15px 0;
    }
    .term-ledger dt { color: #245f52; font-size: 16px; font-weight: 900; }
    .term-ledger dd { margin: 0; color: #40544b; font-size: 15px; line-height: 1.75; }
    .mode-callout,
    .mode-trap {
      max-width: 76ch;
      margin-top: 24px;
      border-left: 4px solid #32766a;
      padding: 5px 0 5px 18px;
      color: #385149;
      font-size: 15px;
      line-height: 1.8;
    }
    .mode-trap { border-color: #bb7438; color: #694521; }
    .mode-callout strong,
    .mode-trap strong { display: block; margin-bottom: 4px; color: #245f52; }
    .mode-trap strong { color: #8c521f; }
    .beginner-scene,
    .toy-example {
      max-width: 76ch;
      margin-top: 25px;
      border: 1px solid #d5ded9;
      border-radius: 10px;
      background: #fbfcfa;
      padding: 20px 22px;
    }
    .beginner-scene { border-left: 5px solid #4f8b7d; }
    .toy-example { border-left: 5px solid #5b7fa6; }
    .beginner-scene h3,
    .toy-example h3 {
      margin: 0 0 9px;
      color: #214f43;
      font-size: 17px;
    }
    .toy-example h3 { color: #315b80; }
    .beginner-scene p,
    .toy-example p {
      margin: 7px 0 0;
      color: #40544b;
      font-size: 15px;
      line-height: 1.8;
    }
    .translation {
      margin-top: 13px !important;
      border-top: 1px dashed #c9d6d0;
      padding-top: 12px;
      color: #2f6155 !important;
      font-weight: 750;
    }
    .toy-flow {
      display: grid;
      gap: 9px;
      margin-top: 15px;
    }
    .toy-row {
      display: grid;
      grid-template-columns: 112px minmax(0, 1fr);
      gap: 12px;
      align-items: start;
      border-top: 1px solid #e1e7e4;
      padding-top: 9px;
    }
    .toy-row:first-child { border-top: 0; padding-top: 0; }
    .toy-row > strong { color: #315b80; font-size: 13px; }
    .toy-row > span { color: #445950; font-size: 14px; line-height: 1.7; }
    .toy-code {
      display: inline-block;
      border: 1px solid #bdccc6;
      border-radius: 5px;
      background: #edf3f0;
      padding: 2px 6px;
      color: #254d43;
      font: 700 13px/1.5 Consolas, monospace;
    }
    .toy-warning {
      margin-top: 13px !important;
      color: #77501f !important;
      font-size: 13px !important;
    }
    .check-yourself {
      max-width: 76ch;
      margin-top: 24px;
      border-top: 2px solid #a9bdb5;
      padding-top: 15px;
    }
    .check-yourself strong { color: #244f45; }
    .check-yourself p { margin: 5px 0 0 !important; font-size: 14px !important; }
    .lecture-visual-pair {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin: 27px 0 31px;
    }
    .lecture-visual {
      margin: 0;
      border: 1px solid #d4ded8;
      border-radius: 10px;
      background: #fff;
      overflow: hidden;
    }
    .lecture-visual img {
      display: block;
      width: 100%;
      height: auto;
      background: #fff;
    }
    .lecture-visual figcaption {
      border-top: 1px solid #e0e6e2;
      padding: 12px 14px 14px;
      color: #53665e;
      font-size: 12px;
      line-height: 1.65;
    }
    .lecture-visual figcaption strong {
      display: block;
      margin-bottom: 3px;
      color: #245f52;
      font-size: 13px;
    }
    .lecture-source-note {
      grid-column: 1 / -1;
      margin: -5px 0 0;
      color: #73827b;
      font-size: 11px;
    }
    .deep-diagram,
    .mode-overview-diagram {
      margin: 30px 0;
      border: 1px solid #d4ded8;
      border-radius: 12px;
      background: #fbfcfa;
      overflow: hidden;
    }
    .deep-diagram iframe,
    .mode-overview-diagram iframe {
      display: block;
      width: 100%;
      border: 0;
      background: #fbfcfa;
    }
    .deep-diagram iframe { aspect-ratio: 940 / 610; }
    .deep-diagram.aes-state-example iframe { aspect-ratio: 1220 / 680; }
    .deep-diagram.generic-concept-diagram iframe {
      height: 430px;
      aspect-ratio: auto;
    }
    .mode-overview-diagram iframe { aspect-ratio: 940 / 730; }
    .deep-diagram figcaption {
      border-top: 1px solid #dfe6e2;
      padding: 11px 14px 13px;
      color: #708078;
      font-size: 12px;
    }
    .deep-steps {
      display: grid;
      gap: 13px;
      margin: 28px 0 0;
      padding: 0;
      list-style: none;
      counter-reset: deep-step;
    }
    .deep-steps li {
      position: relative;
      min-height: 52px;
      border-left: 2px solid #a8beb5;
      padding: 2px 0 2px 48px;
      counter-increment: deep-step;
    }
    .deep-steps li::before {
      content: counter(deep-step);
      position: absolute;
      top: 0;
      left: 12px;
      display: grid;
      width: 25px;
      height: 25px;
      place-items: center;
      border-radius: 50%;
      background: #2c6d60;
      color: white;
      font-size: 11px;
      font-weight: 900;
    }
    .deep-steps strong,
    .deep-steps span { display: block; }
    .deep-steps strong { color: #234e43; font-size: 15px; }
    .deep-steps span { margin-top: 4px; color: #50645b; font-size: 14px; line-height: 1.7; }
    .chapter-concrete-preview,
    .beginner-example-walkthrough,
    .analogy-map,
    .beginner-checkpoints {
      margin-top: 28px;
      border: 1px solid #cfddd7;
      border-radius: 10px;
      background: #f7faf8;
      padding: 20px 22px;
    }
    .chapter-concrete-preview h4,
    .beginner-example-walkthrough h3,
    .analogy-map h3,
    .beginner-checkpoints h3 {
      margin: 0;
      color: #245f52;
      font-size: 18px;
    }
    .chapter-concrete-preview p,
    .beginner-example-walkthrough > p,
    .analogy-map li,
    .beginner-checkpoints li {
      color: #496057;
      font-size: 14px;
      line-height: 1.8;
    }
    .chapter-concrete-preview ol,
    .beginner-checkpoints ol { margin: 14px 0 0; padding-left: 22px; }
    .chapter-concrete-preview li { margin-top: 8px; color: #496057; line-height: 1.75; }
    .analogy-map ul { display: grid; gap: 10px; margin: 16px 0 0; padding: 0; list-style: none; }
    .analogy-map li { display: grid; grid-template-columns: minmax(120px, .7fr) 1.3fr; gap: 14px; }
    .analogy-map li strong { color: #234e43; }
    .walkthrough-result {
      margin-top: 22px !important;
      border-left: 4px solid #d69b3a;
      background: #fff8e9;
      padding: 12px 15px;
    }
    .beginner-terminology {
      margin-top: 26px;
      border-top: 3px solid #5f8f80;
      background: #f5f9f7;
      padding: 20px 20px 22px;
    }
    .beginner-terminology header h4 {
      margin: 3px 0 0;
      color: #214f43;
      font-size: 19px;
    }
    .beginner-terminology header > p:last-child {
      margin: 8px 0 0;
      color: #5b6d65;
      font-size: 13px;
      line-height: 1.7;
    }
    .beginner-term-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
      gap: 12px;
      margin-top: 17px;
    }
    .beginner-term-card {
      border: 1px solid #d2dfda;
      border-radius: 8px;
      background: #fff;
      padding: 14px 15px;
    }
    .beginner-term-card h5 {
      margin: 0;
      color: #245f52;
      font-size: 15px;
    }
    .beginner-term-card p {
      margin: 7px 0 0 !important;
      color: #4f625a !important;
      font-size: 13px !important;
      line-height: 1.72 !important;
    }
    .card-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 18px;
    }
    .ws2526-guide-callout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 26px;
      align-items: center;
      margin: 28px 0;
      border: 1px solid #b9d0c7;
      border-left: 6px solid #2d7463;
      border-radius: 10px;
      background: #f3f8f5;
      padding: 24px 26px;
    }
    .ws2526-guide-callout h2 { margin: 3px 0 0; color: #214f43; font-size: 22px; }
    .ws2526-guide-callout p { margin: 9px 0 0; color: #50645b; line-height: 1.75; }
    .ws2526-learning-loop {
      margin: 30px 0 44px;
      border: 1px solid #ccd9d4;
      background: #f8faf9;
      padding: 12px;
    }
    .ws2526-learning-loop iframe {
      display: block;
      width: 100%;
      height: 356px;
      border: 0;
      background: #f8fafc;
    }
    .ws2526-learning-loop figcaption {
      border-top: 1px solid #d5dfdb;
      padding: 12px 10px 4px;
      color: #5a6d65;
      font-size: 13px;
      line-height: 1.65;
    }
    .ws2526-index-hero,
    .ws2526-guide-hero {
      border-bottom: 1px solid #d5dfda;
      padding: 20px 0 36px;
    }
    .ws2526-index-hero h2,
    .ws2526-guide-hero h2 {
      margin: 7px 0 0;
      color: #173f36;
      font-size: clamp(31px, 5vw, 48px);
      line-height: 1.15;
      letter-spacing: -0.035em;
    }
    .ws2526-index-hero > p,
    .ws2526-guide-hero > p {
      max-width: 78ch;
      color: #52645c;
      font-size: 16px;
      line-height: 1.85;
    }
    .ws2526-guide-hero > aside {
      max-width: 76ch;
      margin-top: 24px;
      border-left: 5px solid #d59a3b;
      background: #fff8e9;
      padding: 18px 21px;
    }
    .ws2526-guide-hero > aside h3 { margin: 0; color: #754d14; font-size: 17px; }
    .ws2526-guide-hero > aside p { margin: 7px 0 0; color: #655232; line-height: 1.78; }
    .ws2526-index-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 18px;
      margin-top: 34px;
    }
    .ws2526-index-card {
      display: grid;
      grid-template-columns: 48px minmax(0, 1fr);
      gap: 18px;
      border: 1px solid #d3ded9;
      border-radius: 10px;
      background: #fff;
      padding: 22px;
    }
    .ws2526-index-card > span {
      display: grid;
      width: 42px;
      height: 42px;
      place-items: center;
      border-radius: 50%;
      background: #285f52;
      color: #fff;
      font-size: 12px;
      font-weight: 900;
    }
    .ws2526-index-card h2 { margin: 4px 0 0; color: #204f43; font-size: 20px; line-height: 1.3; }
    .ws2526-index-card p:not(.eyebrow) { color: #5a6b63; line-height: 1.7; }
    .ws2526-index-card .button { margin-top: 16px; }
    .ws2526-visual {
      margin: 34px 0;
      border: 1px solid #ccd9d4;
      border-radius: 12px;
      background: #f8faf9;
      padding: 24px;
      overflow-x: auto;
    }
    .ws2526-visual figcaption strong,
    .ws2526-visual figcaption span { display: block; }
    .ws2526-visual figcaption strong { color: #214f43; font-size: 21px; }
    .ws2526-visual figcaption span { margin-top: 5px; color: #65766e; font-size: 13px; }
    .ws2526-visual ol {
      display: flex;
      align-items: stretch;
      gap: 34px;
      min-width: max-content;
      margin: 23px 0 0;
      padding: 0;
      list-style: none;
    }
    .ws2526-visual li {
      position: relative;
      display: grid;
      width: 155px;
      min-height: 92px;
      align-content: center;
      border: 1px solid #aac2b9;
      border-radius: 9px;
      background: #eaf3ef;
      padding: 16px;
    }
    .ws2526-visual li:not(:last-child)::after {
      content: "→";
      position: absolute;
      top: 50%;
      right: -26px;
      color: #668b7f;
      font-size: 20px;
      transform: translateY(-50%);
    }
    .ws2526-visual li span { color: #638076; font-size: 11px; font-weight: 900; }
    .ws2526-visual li strong { margin-top: 6px; color: #244f44; font-size: 15px; line-height: 1.4; }
    .ws2526-fixed-method {
      display: grid;
      grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr);
      gap: 34px;
      margin: 38px 0 50px;
    }
    .ws2526-fixed-method > div,
    .ws2526-fixed-method > aside {
      border-top: 4px solid #4f8778;
      background: #f7faf8;
      padding: 22px 24px;
    }
    .ws2526-fixed-method h2,
    .ws2526-fixed-method h3 { margin: 0; color: #214f43; }
    .ws2526-fixed-method ol,
    .ws2526-fixed-method ul { margin: 17px 0 0; padding-left: 23px; }
    .ws2526-fixed-method li { margin-top: 10px; color: #4b6057; line-height: 1.72; }
    .ws2526-concept-lecture,
    .ws2526-actual-commentary,
    .ws2526-checkpoints { margin-top: 56px; }
    .ws2526-concept-lecture > header,
    .ws2526-actual-commentary > header { max-width: 76ch; margin-bottom: 24px; }
    .ws2526-concept-lecture h2,
    .ws2526-actual-commentary h2,
    .ws2526-checkpoints h2 { margin: 4px 0 0; color: #173f36; font-size: 29px; }
    .ws2526-concept-lecture > header > p:last-child,
    .ws2526-actual-commentary > header > p:last-child { color: #596b63; line-height: 1.75; }
    .ws2526-concept-card {
      border-top: 1px solid #cfdad5;
      background: #fff;
    }
    .ws2526-concept-card:last-child { border-bottom: 1px solid #cfdad5; }
    .ws2526-concept-card > summary {
      display: grid;
      grid-template-columns: 54px minmax(0, 1fr);
      gap: 14px;
      align-items: center;
      cursor: pointer;
      padding: 18px 4px;
      list-style: none;
    }
    .ws2526-concept-card > summary::-webkit-details-marker { display: none; }
    .ws2526-concept-card > summary span { color: #6b7f76; font-size: 11px; font-weight: 900; text-transform: uppercase; }
    .ws2526-concept-card > summary strong { color: #285c50; font-size: 18px; }
    .ws2526-concept-card > div { padding: 0 12px 30px 68px; }
    .ws2526-concept-card section > h4 { color: #2a5e51; font-size: 17px; }
    .ws2526-concept-card section > p { color: #4f625a; line-height: 1.82; }
    .ws2526-analogy {
      border-left: 4px solid #d9a14c;
      background: #fff9ed;
      padding: 12px 18px;
    }
    .ws2526-concept-steps { padding-left: 22px; }
    .ws2526-concept-steps li { margin-top: 8px; color: #50635a; line-height: 1.72; }
    .ws2526-question-group { margin-top: 38px; }
    .ws2526-question-group > header {
      display: flex;
      flex-wrap: wrap;
      gap: 7px 22px;
      align-items: baseline;
      border-bottom: 2px solid #2d6557;
      padding-bottom: 13px;
    }
    .ws2526-question-group > header .eyebrow { width: 100%; }
    .ws2526-question-group > header h2 { margin: 0; font-size: 23px; }
    .ws2526-question-group > header p:last-child { margin: 0; color: #6a7a73; font-size: 13px; }
    .ws2526-subproblem { border-bottom: 1px solid #d7e0dc; }
    .ws2526-subproblem > summary {
      display: grid;
      grid-template-columns: 92px minmax(0, 1fr) auto;
      gap: 18px;
      align-items: center;
      cursor: pointer;
      padding: 21px 5px;
      list-style: none;
    }
    .ws2526-subproblem > summary::-webkit-details-marker { display: none; }
    .ws2526-problem-number { color: #2e6a5b; font-size: 13px; font-weight: 900; }
    .ws2526-subproblem > summary strong,
    .ws2526-subproblem > summary small { display: block; }
    .ws2526-subproblem > summary strong { color: #263f37; font-size: 17px; line-height: 1.45; }
    .ws2526-subproblem > summary small { margin-top: 5px; color: #73827b; font-size: 12px; }
    .ws2526-subproblem > summary b {
      border-radius: 99px;
      background: #e8f0ed;
      padding: 6px 10px;
      color: #356155;
      font-size: 11px;
    }
    .ws2526-subproblem-body {
      margin: 0 0 32px 110px;
      border-left: 3px solid #a8c2b8;
      background: #fbfcfb;
      padding: 9px 26px 26px;
    }
    .ws2526-subproblem-body > section { margin-top: 25px; }
    .ws2526-subproblem-body h3 { margin: 0; color: #285c50; font-size: 18px; }
    .ws2526-subproblem-body h4 { color: #315e53; }
    .ws2526-subproblem-body p,
    .ws2526-subproblem-body li { color: #4e6159; line-height: 1.78; }
    .ws2526-original-question [lang="de"] { color: #344a43; font-weight: 700; }
    .ws2526-concept-bridge {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
      gap: 12px;
      margin-top: 16px;
    }
    .ws2526-concept-bridge article {
      border: 1px solid #d6e0dc;
      background: #fff;
      padding: 15px;
    }
    .ws2526-concept-bridge h5 { margin: 0; color: #2c6255; font-size: 14px; }
    .ws2526-concept-bridge p { margin: 7px 0 0; font-size: 13px; }
    .ws2526-exact-solution > ol {
      display: grid;
      gap: 0;
      margin-top: 22px;
      padding: 0;
      list-style: none;
      counter-reset: none;
    }
    .ws2526-solution-intro {
      max-width: 72ch;
      color: #4a5f56 !important;
      font-size: 15px;
      line-height: 1.82 !important;
    }
    .ws2526-problem-setup {
      margin-top: 22px;
      border-top: 3px solid #557b70;
      border-bottom: 1px solid #cddbd6;
      background: #f4f8f6;
      padding: 22px 24px 24px;
    }
    .ws2526-problem-setup > header > span {
      color: #557b70;
      font-size: 10px;
      font-weight: 900;
      letter-spacing: .16em;
    }
    .ws2526-problem-setup > header h4 {
      margin: 5px 0 0;
      color: #244f45;
      font-size: 19px;
    }
    .ws2526-problem-setup > header p {
      max-width: 76ch;
      margin: 8px 0 0;
      color: #52665e;
      font-size: 14px;
      line-height: 1.75;
    }
    .ws2526-instructor-reading {
      margin-top: 20px;
      border-left: 4px solid #d49a45;
      background: #fffaf0;
      padding: 15px 18px;
    }
    .ws2526-instructor-reading h5 {
      margin: 0;
      color: #76521e;
      font-size: 15px;
    }
    .ws2526-instructor-reading p {
      margin: 8px 0 0 !important;
      color: #554b3c !important;
      font-size: 14px !important;
      line-height: 1.75 !important;
    }
    .ws2526-setup-columns {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 28px;
      margin-top: 23px;
    }
    .ws2526-setup-group {
      min-width: 0;
      border-top: 1px solid #a9c0b8;
      padding-top: 13px;
    }
    .ws2526-setup-group h5,
    .ws2526-formula-ledger h5 {
      margin: 0;
      color: #2a5d51;
      font-size: 15px;
    }
    .ws2526-setup-group ul,
    .ws2526-formula-ledger ul {
      margin: 10px 0 0;
      padding: 0;
      list-style: none;
    }
    .ws2526-setup-item {
      display: block !important;
      border: 0 !important;
      border-bottom: 1px solid #d7e2de !important;
      background: transparent !important;
      padding: 11px 0 !important;
    }
    .ws2526-setup-item:last-child { border-bottom: 0 !important; }
    .ws2526-setup-item > strong {
      display: block !important;
      width: auto !important;
      height: auto !important;
      border-radius: 0 !important;
      background: transparent !important;
      color: #53665f !important;
      font-size: 11px !important;
      font-weight: 800;
      letter-spacing: .04em !important;
    }
    .ws2526-setup-item > p {
      margin: 5px 0 0 !important;
      color: #354a42 !important;
      font-size: 14px !important;
      line-height: 1.7 !important;
    }
    .ws2526-setup-item > .ws2526-setup-explanation {
      color: #63756e !important;
      font-size: 13px !important;
    }
    .ws2526-formula-ledger {
      margin-top: 20px;
      border-top: 1px solid #a9c0b8;
      padding-top: 13px;
    }
    .ws2526-formula-ledger > ul {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      column-gap: 24px;
    }
    .ws2526-math-block {
      max-width: 100%;
      margin-top: 5px;
      overflow-x: auto;
      overflow-y: hidden;
      color: #203f38;
      font-size: 17px;
      -webkit-overflow-scrolling: touch;
    }
    .ws2526-math-block mjx-container[display="true"] {
      margin: .45em 0 !important;
      text-align: left !important;
    }
    .ws2526-exact-solution li {
      display: grid;
      grid-template-columns: 46px minmax(0, 1fr);
      gap: 17px;
      border-top: 1px solid #d1ddd8;
      background: transparent;
      padding: 22px 4px;
    }
    .ws2526-exact-solution li:last-child { border-bottom: 1px solid #d1ddd8; }
    .ws2526-exact-solution li > strong {
      display: grid;
      width: 38px;
      height: 38px;
      place-items: center;
      border-radius: 50%;
      background: #e2efea;
      color: #2b6556;
      font-size: 11px;
      letter-spacing: .05em;
    }
    .ws2526-exact-solution li h4 {
      margin: 0;
      color: #285c50;
      font-size: 17px;
      line-height: 1.5;
    }
    .ws2526-exact-solution li p {
      margin: 7px 0 0;
      color: #4c6057;
      font-size: 15px;
      line-height: 1.82;
    }
    .ws2526-exact-solution li p > b {
      display: block;
      margin-bottom: 3px;
      color: #2e5f53;
      font-size: 11px;
      font-weight: 900;
      letter-spacing: .04em;
    }
    .ws2526-exact-solution li .ws2526-step-why {
      margin-top: 10px;
      color: #586a63;
      font-size: 13px;
    }
    .ws2526-exact-solution li .ws2526-step-input {
      margin-top: 12px;
      border-left: 3px solid #86aa9e;
      background: #f3f8f6;
      padding: 10px 13px;
      color: #3d544c;
      font-size: 14px;
    }
    .ws2526-exact-solution li .ws2526-step-input span {
      display: block;
      margin-top: 5px;
      color: #244c42;
      font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
      font-size: 13px;
      font-weight: 700;
      overflow-wrap: anywhere;
    }
    .ws2526-exact-solution li .ws2526-step-work {
      margin-top: 14px;
      color: #314a41;
    }
    .ws2526-exact-solution li .ws2526-step-handoff {
      margin-top: 12px;
      color: #66756f;
      font-size: 13px;
    }
    .ws2526-answer {
      border-left: 4px solid #4f76a0;
      background: #f4f7fb;
      padding: 17px 20px;
    }
    .ws2526-traps {
      border-left: 4px solid #c68c3d;
      background: #fff8ed;
      padding: 17px 20px;
    }
    .ws2526-reinforcement {
      border: 1px solid #bfd3cc;
      border-top: 5px solid #28695a;
      background: #f5faf8;
      padding: 22px;
    }
    .ws2526-reinforcement > header > span {
      color: #28695a;
      font-size: 11px;
      font-weight: 850;
      letter-spacing: .14em;
    }
    .ws2526-reinforcement > header h3 { margin-top: 6px; }
    .ws2526-reinforcement > header p { max-width: 75ch; margin-bottom: 0; }
    .ws2526-microtasks {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
      margin: 20px 0 0;
      padding: 0;
      list-style: none;
    }
    .ws2526-microtasks > li {
      min-width: 0;
      border: 1px solid #d2dfda;
      background: #fff;
      padding: 17px 18px;
    }
    .ws2526-microtasks > li > strong {
      color: #225a4d;
      font-size: 14px;
    }
    .ws2526-microtasks > li p { margin: 9px 0 0; }
    .ws2526-microtasks > li ul { margin: 9px 0 0; padding-left: 20px; }
    .ws2526-microtasks textarea {
      width: 100%;
      margin-top: 12px;
      border: 1px solid #b9cbc5;
      border-radius: 8px;
      background: #fbfdfc;
      padding: 11px 12px;
      color: #173f36;
      font: inherit;
      line-height: 1.55;
      resize: vertical;
    }
    .ws2526-microtasks textarea:focus {
      outline: 3px solid rgba(40, 105, 90, .18);
      border-color: #28695a;
    }
    .ws2526-microtasks > li details {
      margin-top: 12px;
      border-top: 1px solid #d9e4e0;
      padding-top: 10px;
    }
    .ws2526-microtasks > li summary,
    .ws2526-reinforcement-answer > summary {
      cursor: pointer;
      color: #285f53;
      font-weight: 750;
    }
    .ws2526-task-rule {
      border-left: 3px solid #91b4a8;
      padding-left: 11px;
      font-size: 13px;
    }
    .ws2526-transfer {
      border-top: 1px dashed #c5d6d0;
      padding-top: 10px;
    }
    .ws2526-reinforcement .recall-slot-check {
      margin-top: 12px;
      box-shadow: none;
    }
    .ws2526-reinforcement-answer {
      margin-top: 15px;
      border-top: 1px solid #cbdcd6;
      padding-top: 13px;
    }
    .ws2526-confidence {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 14px 0 0;
      border: 0;
      padding: 0;
    }
    .ws2526-confidence legend {
      width: 100%;
      margin-bottom: 5px;
      color: #355f55;
      font-size: 13px;
      font-weight: 800;
    }
    .ws2526-confidence label {
      border: 1px solid #c5d6d0;
      border-radius: 999px;
      padding: 7px 10px;
      background: #f8fbfa;
      font-size: 13px;
    }
    .ws2526-mastery-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 13px;
    }
    .ws2526-mastery-actions button {
      border: 1px solid #9db9b0;
      border-radius: 7px;
      background: #fff;
      padding: 8px 11px;
      color: #285f53;
      font: inherit;
      font-size: 13px;
      font-weight: 750;
      cursor: pointer;
    }
    .ws2526-mastery-actions button.is-active {
      border-color: #28695a;
      background: #28695a;
      color: #fff;
    }
    .ws2526-mastery-output {
      display: block;
      margin-top: 12px;
      border-left: 3px solid #91b4a8;
      padding-left: 10px;
      color: #3f5f56;
      font-size: 13px;
      line-height: 1.55;
    }
    .ws2526-subproblem-body > footer {
      display: flex;
      flex-wrap: wrap;
      gap: 14px 24px;
      align-items: center;
      justify-content: space-between;
      margin-top: 24px;
      border-top: 1px solid #d8e0dc;
      padding-top: 18px;
      color: #728078;
      font-size: 12px;
    }
    .ws2526-checkpoints {
      border-top: 4px solid #d19a43;
      background: #fff9ed;
      padding: 24px 27px;
    }
    .ws2526-checkpoints ol { padding-left: 23px; }
    .ws2526-checkpoints li { margin-top: 10px; color: #5e533d; line-height: 1.72; }
    .ws2526-chapter-index {
      margin-top: 62px;
      padding-top: 28px;
      border-top: 3px solid #315f54;
    }
    .ws2526-chapter-index > header { max-width: 78ch; margin-bottom: 24px; }
    .ws2526-chapter-index > header h2 {
      margin: 4px 0 0;
      color: #173f36;
      font-size: clamp(27px, 3vw, 38px);
    }
    .ws2526-chapter-index > header p:last-child {
      color: #5a6b63;
      line-height: 1.75;
    }
    .ws2526-exact-transcript {
      margin-top: 48px;
      padding: 30px;
      border: 1px solid #c9d7d1;
      border-left: 6px solid #315f54;
      border-radius: 12px;
      background: #fbfdfc;
    }
    .ws2526-exact-transcript > header { max-width: 78ch; }
    .ws2526-exact-transcript h2 { margin: 4px 0 0; color: #173f36; font-size: 28px; }
    .ws2526-exact-transcript header p:last-child { color: #596b63; line-height: 1.75; }
    .ws2526-exact-rendered {
      margin-top: 26px;
      padding-top: 22px;
      border-top: 1px solid #d4dfda;
    }
    .ws2526-exact-rendered h3,
    .ws2526-exact-rendered h4,
    .ws2526-exact-rendered h5 { color: #234f44; line-height: 1.35; }
    .ws2526-exact-rendered h3 { margin: 0 0 22px; font-size: 23px; }
    .ws2526-exact-rendered h4,
    .ws2526-exact-rendered h5 { margin: 28px 0 12px; font-size: 18px; }
    .ws2526-exact-rendered p {
      max-width: 82ch;
      color: #344a43;
      line-height: 1.82;
    }
    .ws2526-exam-numbered {
      margin-top: 28px;
      padding-top: 20px;
      border-top: 1px solid #dbe4e0;
    }
    .ws2526-exam-numbered strong { color: #1f5a4b; font-size: 18px; }
    .ws2526-exam-bullet { margin-left: 22px; }
    .ws2526-formula {
      font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
      color: #173f36;
    }
    .ws2526-table-scroll { max-width: 100%; overflow-x: auto; margin: 20px 0 28px; }
    .ws2526-exact-rendered table {
      width: 100%;
      min-width: 620px;
      border-collapse: collapse;
      background: #fff;
    }
    .ws2526-exact-rendered th,
    .ws2526-exact-rendered td {
      padding: 10px 12px;
      border: 1px solid #cfdad5;
      color: #344a43;
      text-align: left;
      vertical-align: top;
      line-height: 1.55;
    }
    .ws2526-exact-rendered th { background: #edf4f0; color: #234f44; }
    .ws2526-exact-transcript pre,
    .ws2526-original-question pre {
      max-width: 100%;
      overflow-x: auto;
      white-space: pre-wrap;
      overflow-wrap: anywhere;
      font: 14px/1.72 ui-monospace, SFMono-Regular, Consolas, monospace;
      color: #263f37;
      background: #f0f5f2;
      border: 1px solid #d4dfda;
      border-radius: 8px;
      padding: 20px;
    }
    .ws2526-source-note { color: #6a7a73; font-size: 12px; line-height: 1.6; }
    .ws2526-concept-prose {
      max-width: 78ch;
      padding: 34px 0 38px;
      border-top: 1px solid #cfdad5;
    }
    .ws2526-concept-prose:last-child { border-bottom: 1px solid #cfdad5; }
    .ws2526-concept-prose h3 {
      margin: 5px 0 20px;
      color: #285c50;
      font-size: 24px;
    }
    .ws2526-concept-prose p,
    .ws2526-concept-prose li {
      color: #475b53;
      font-size: 16px;
      line-height: 1.9;
    }
    .ws2526-concept-number {
      margin: 0;
      color: #788981 !important;
      font-size: 11px !important;
      font-weight: 900;
      letter-spacing: .08em;
      text-transform: uppercase;
    }
    .ws2526-concept-boundary {
      margin-top: 22px;
      padding-left: 16px;
      border-left: 3px solid #d9a74f;
      color: #655232 !important;
    }
    .ws2526-concept-bridge {
      display: block;
      max-width: 76ch;
      margin-top: 20px;
    }
    .ws2526-concept-bridge section {
      padding: 24px 0;
      border-top: 1px solid #d7e0dc;
    }
    .ws2526-concept-bridge section:last-child { border-bottom: 1px solid #d7e0dc; }
    .ws2526-concept-bridge h4 { margin: 0 0 10px; color: #2c6255; font-size: 18px; }
    .ws2526-concept-bridge p { margin: 9px 0 0; font-size: 15px; line-height: 1.85; }
    .ws2526-reading-lead {
      max-width: 72ch;
      font-size: 17px;
      color: #334f46 !important;
    }
    .ws2526-question-terms {
      max-width: 78ch;
      padding: 28px 0 8px;
    }
    .ws2526-question-terms h3 {
      margin: 5px 0 10px;
      color: #285c50;
      font-size: 22px;
    }
    .ws2526-term-intro {
      max-width: 72ch;
      color: #5c6d65 !important;
      font-size: 15px;
      line-height: 1.8 !important;
    }
    .ws2526-question-terms dl { margin: 24px 0 0; }
    .ws2526-term-row {
      display: grid;
      grid-template-columns: minmax(170px, .38fr) minmax(0, 1fr);
      gap: 26px;
      padding: 20px 0;
      border-top: 1px solid #d5dfdb;
    }
    .ws2526-term-row:last-child { border-bottom: 1px solid #d5dfdb; }
    .ws2526-term-row dt {
      color: #23584b;
      font-size: 16px;
      font-weight: 850;
      line-height: 1.5;
    }
    .ws2526-term-row dt span {
      display: inline-block;
      min-width: 30px;
      color: #8a9a93;
      font-size: 10px;
      letter-spacing: .05em;
      vertical-align: 2px;
    }
    .ws2526-term-row dd { margin: 0; }
    .ws2526-term-row dd p { margin: 0; color: #475b53; line-height: 1.78; }
    .ws2526-term-example {
      margin-top: 8px !important;
      color: #655232 !important;
      font-size: 14px;
    }
    .ws2526-beginner-expansion {
      margin-top: 38px !important;
      border: 1px solid #b9d0c7;
      border-top: 6px solid #246656;
      background: #fff;
      padding: 30px;
    }
    .ws2526-beginner-expansion > header {
      max-width: 78ch;
      padding-bottom: 22px;
      border-bottom: 1px solid #d5e0dc;
    }
    .ws2526-beginner-expansion > header > span,
    .ws2526-worked-example > header > span {
      color: #2f6b5c;
      font-size: 10px;
      font-weight: 900;
      letter-spacing: .14em;
    }
    .ws2526-beginner-expansion > header h3 {
      margin: 7px 0 0;
      color: #19483d;
      font-size: 25px;
      line-height: 1.3;
    }
    .ws2526-beginner-expansion > header p {
      margin: 10px 0 0;
      color: #556a61;
      font-size: 15px;
      line-height: 1.82;
    }
    .ws2526-beginner-expansion code,
    .ws2526-answer-expansion code,
    .ws2526-exact-solution .ws2526-step-check code {
      border: 1px solid #d6e0dc;
      border-radius: 4px;
      background: #f2f6f4;
      padding: .08em .34em;
      color: #244b41;
      font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
      font-size: .92em;
      overflow-wrap: anywhere;
    }
    .ws2526-foundation {
      max-width: 76ch;
      padding: 30px 0 8px;
    }
    .ws2526-foundation h4,
    .ws2526-analogy-map h4,
    .ws2526-worked-example h4 {
      margin: 0 0 14px;
      color: #23584b;
      font-size: 20px;
    }
    .ws2526-foundation p {
      margin: 13px 0 0;
      color: #3f554c;
      font-size: 16px;
      line-height: 1.92;
    }
    .ws2526-analogy-map {
      margin-top: 30px !important;
      border-left: 5px solid #c88a2e;
      background: #fff9ed;
      padding: 24px 25px;
    }
    .ws2526-analogy-map > div {
      max-width: 74ch;
    }
    .ws2526-analogy-map > div p {
      margin: 8px 0 0;
      color: #5d5038;
      font-size: 15px;
      line-height: 1.82;
    }
    .ws2526-analogy-map ul {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
      margin: 20px 0 0;
      padding: 0;
      list-style: none;
    }
    .ws2526-analogy-map li {
      display: grid;
      grid-template-columns: minmax(0, .9fr) auto minmax(0, 1.1fr);
      gap: 10px;
      align-items: center;
      border: 1px solid #ead9b9;
      background: #fffdf8;
      padding: 13px 14px;
      color: #5c513d;
      font-size: 13px;
      line-height: 1.6;
    }
    .ws2526-analogy-map li i {
      color: #a27531;
      font-style: normal;
      font-weight: 900;
    }
    .ws2526-analogy-map li strong {
      color: #35594f;
    }
    .ws2526-analogy-limit {
      margin: 17px 0 0 !important;
      border-top: 1px solid #e5d4b4;
      padding-top: 14px;
      color: #6d5431 !important;
      font-size: 13px;
      line-height: 1.72 !important;
    }
    .ws2526-analogy-limit b {
      display: block;
      margin-bottom: 3px;
      color: #8a5a18;
    }
    .ws2526-question-visual {
      margin: 34px 0 0;
      border: 1px solid #cbd9d4;
      background: #f7faf9;
      padding: 23px;
      overflow-x: auto;
    }
    .ws2526-question-visual figcaption span,
    .ws2526-question-visual figcaption strong {
      display: block;
    }
    .ws2526-question-visual figcaption span {
      color: #6a7f77;
      font-size: 10px;
      font-weight: 900;
      letter-spacing: .12em;
    }
    .ws2526-question-visual figcaption strong {
      margin-top: 5px;
      color: #234f44;
      font-size: 20px;
    }
    .ws2526-question-visual > ol {
      display: flex;
      align-items: stretch;
      gap: 30px;
      min-width: max-content;
      margin: 20px 0 0;
      padding: 0;
      list-style: none;
    }
    .ws2526-question-visual > ol > li {
      position: relative;
      display: grid;
      width: 156px;
      min-height: 112px;
      align-content: start;
      border: 1px solid #98acb7;
      background: #e7f0f5;
      padding: 15px;
    }
    .ws2526-question-visual > ol > li:not(:last-child)::after {
      content: "→";
      position: absolute;
      top: 50%;
      right: -23px;
      color: #728d84;
      font-size: 18px;
      transform: translateY(-50%);
    }
    .ws2526-question-visual > ol > li.is-input {
      border-color: #8db1c5;
      background: #e6f2f8;
    }
    .ws2526-question-visual > ol > li.is-process {
      border-color: #9ea9c7;
      background: #edf0fa;
    }
    .ws2526-question-visual > ol > li.is-result {
      border-color: #7eaa9d;
      background: #e8f4f0;
    }
    .ws2526-question-visual > ol > li.is-risk {
      border-color: #d4a29d;
      background: #fff0ee;
    }
    .ws2526-question-visual > ol > li.is-neutral {
      border-color: #aeb8b4;
      background: #f0f3f2;
    }
    .ws2526-question-visual li > span {
      color: #6c8078;
      font-size: 10px;
      font-weight: 900;
      letter-spacing: .08em;
    }
    .ws2526-question-visual li > strong {
      margin-top: 7px;
      color: #284e44;
      font-size: 14px;
      line-height: 1.45;
    }
    .ws2526-question-visual li > p {
      margin: 8px 0 0;
      color: #53665f;
      font-size: 12px;
      line-height: 1.62;
    }
    .ws2526-question-visual > p {
      max-width: 76ch;
      margin: 16px 0 0;
      color: #60716a;
      font-size: 13px;
      line-height: 1.68;
    }
    .ws2526-question-visual.is-flow > ol {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(145px, 1fr));
      min-width: 0;
      gap: 14px;
    }
    .ws2526-question-visual.is-flow > ol > li {
      width: auto;
    }
    .ws2526-question-visual.is-flow > ol > li::after {
      content: none;
    }
    .ws2526-question-visual.is-compare > ol,
    .ws2526-question-visual.is-table > ol,
    .ws2526-question-visual.is-math > ol,
    .ws2526-question-visual.is-stack > ol,
    .ws2526-question-visual.is-code > ol {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
      min-width: 0;
      gap: 10px;
    }
    .ws2526-question-visual.is-compare > ol > li,
    .ws2526-question-visual.is-table > ol > li,
    .ws2526-question-visual.is-math > ol > li,
    .ws2526-question-visual.is-stack > ol > li,
    .ws2526-question-visual.is-code > ol > li {
      width: auto;
    }
    .ws2526-question-visual.is-compare > ol > li::after,
    .ws2526-question-visual.is-table > ol > li::after,
    .ws2526-question-visual.is-math > ol > li::after,
    .ws2526-question-visual.is-stack > ol > li::after,
    .ws2526-question-visual.is-code > ol > li::after {
      content: none;
    }
    .ws2526-worked-example {
      margin-top: 34px !important;
      border-top: 4px solid #4d759c;
      background: #f5f8fb;
      padding: 25px;
    }
    .ws2526-worked-example > header {
      max-width: 76ch;
    }
    .ws2526-worked-example > header > span {
      color: #4d759c;
    }
    .ws2526-worked-example > header h4 {
      margin-top: 6px;
      color: #2f5478;
    }
    .ws2526-worked-example > header p {
      margin: 8px 0 0;
      color: #485d70;
      line-height: 1.75;
    }
    .ws2526-worked-example > ol {
      margin: 22px 0 0;
      padding: 0;
      list-style: none;
    }
    .ws2526-worked-example > ol > li {
      display: grid;
      grid-template-columns: 40px minmax(0, 1fr);
      gap: 15px;
      border-top: 1px solid #cad7e2;
      padding: 17px 0;
    }
    .ws2526-worked-example > ol > li > span {
      display: grid;
      width: 34px;
      height: 34px;
      place-items: center;
      border-radius: 50%;
      background: #dfeaf3;
      color: #3e678b;
      font-size: 11px;
      font-weight: 900;
    }
    .ws2526-worked-example li h5 {
      margin: 2px 0 0;
      color: #2f5678;
      font-size: 15px;
      line-height: 1.5;
    }
    .ws2526-worked-example li p {
      margin: 7px 0 0;
      color: #4d6071;
      font-size: 14px;
      line-height: 1.72;
    }
    .ws2526-worked-example li p b,
    .ws2526-example-result p b {
      color: #335d80;
    }
    .ws2526-example-result {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 15px;
      margin-top: 7px;
    }
    .ws2526-example-result p {
      margin: 0;
      border: 1px solid #c8d6e1;
      background: #fff;
      padding: 14px 15px;
      color: #435b6e;
      font-size: 14px;
      line-height: 1.72;
    }
    .ws2526-beginner-sources {
      margin-top: 28px;
      border-top: 1px solid #d4dfda;
      padding-top: 20px;
    }
    .ws2526-beginner-sources h4 {
      margin: 0;
      color: #315e53;
      font-size: 16px;
    }
    .ws2526-beginner-sources > p {
      max-width: 76ch;
      margin: 7px 0 0;
      color: #607169;
      font-size: 13px;
      line-height: 1.72;
    }
    .ws2526-beginner-sources ul {
      display: grid;
      gap: 8px;
      margin: 14px 0 0;
      padding: 0;
      list-style: none;
    }
    .ws2526-beginner-sources li {
      display: grid;
      grid-template-columns: minmax(190px, .8fr) minmax(0, 1.4fr) auto;
      gap: 12px;
      align-items: start;
      border-top: 1px solid #e0e7e4;
      padding-top: 10px;
      color: #596b63;
      font-size: 12px;
      line-height: 1.6;
    }
    .ws2526-beginner-sources li a {
      color: #2d6758;
      font-weight: 750;
      white-space: nowrap;
    }
    .ws2526-answer-expansion {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 15px;
      margin-top: 16px !important;
    }
    .ws2526-answer-expansion > div,
    .ws2526-answer-expansion > details {
      border: 1px solid #d1ddd8;
      background: #fff;
      padding: 18px;
    }
    .ws2526-answer-expansion h4 {
      margin: 0 0 9px;
      color: #285c50;
      font-size: 16px;
    }
    .ws2526-answer-expansion p {
      margin: 8px 0 0;
      color: #4a5f56;
      font-size: 14px;
      line-height: 1.76;
    }
    .ws2526-confusion-repair {
      border-left: 4px solid #c18a3d !important;
      background: #fffaf1 !important;
    }
    .ws2526-confusion-repair p b,
    .ws2526-answer-why p b {
      color: #6c4a1d;
    }
    .ws2526-quick-check {
      grid-column: 1 / -1;
      border-left: 4px solid #4f76a0 !important;
      background: #f5f8fb !important;
    }
    .ws2526-quick-check > summary {
      cursor: pointer;
      color: #315d83;
      font-weight: 850;
    }
    .ws2526-quick-answer {
      margin-top: 13px !important;
      border-top: 1px solid #cad8e3;
      padding-top: 12px;
    }
    .ws2526-exact-solution li .ws2526-step-check {
      margin-top: 12px;
      border-left: 3px solid #c89442;
      background: #fff9ef;
      padding: 10px 13px;
      color: #645338;
      font-size: 13px;
    }
    .ws2526-selection-guide {
      max-width: 78ch;
      margin-top: 34px;
      padding: 30px 0 8px;
      border-top: 3px solid #2d6a5a;
    }
    .ws2526-selection-guide h3 {
      margin: 5px 0 10px;
      color: #205648;
      font-size: 24px;
    }
    .ws2526-selection-intro {
      max-width: 72ch;
      color: #40574e !important;
      font-size: 16px;
      line-height: 1.85 !important;
    }
    .ws2526-selection-guide > ol {
      margin: 25px 0 0;
      padding: 0;
      list-style: none;
      counter-reset: none;
    }
    .ws2526-selection-guide > ol > li {
      padding: 20px 0;
      border-top: 1px solid #d5dfdb;
    }
    .ws2526-selection-guide > ol > li:last-child {
      border-bottom: 1px solid #d5dfdb;
    }
    .ws2526-selection-guide > ol h4 {
      margin: 0;
      color: #285c50;
      font-size: 17px;
    }
    .ws2526-selection-guide > ol p {
      margin-top: 8px;
      color: #4b5f56;
      line-height: 1.82;
    }
    .ws2526-selection-examples {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      margin-top: 26px;
    }
    .ws2526-selection-table {
      min-width: 0;
      overflow-x: auto;
    }
    .ws2526-selection-table h4 {
      margin: 0 0 10px;
      color: #315e53;
      font-size: 15px;
    }
    .ws2526-selection-table table {
      width: 100%;
      border-collapse: collapse;
      background: #fbfdfc;
    }
    .ws2526-selection-table th,
    .ws2526-selection-table td {
      border: 1px solid #d2ddd8;
      padding: 10px 12px;
      color: #42574e;
      text-align: left;
      vertical-align: top;
      line-height: 1.55;
    }
    .ws2526-selection-table th {
      width: 76px;
      background: #edf4f0;
      color: #23584b;
      white-space: nowrap;
    }
    .ws2526-memory-hook {
      margin-top: 22px !important;
      border-left: 4px solid #d59a3b;
      background: #fff8e9;
      padding: 16px 18px;
      color: #655232 !important;
      line-height: 1.75 !important;
    }
    .ws2526-structure-note {
      padding: 18px 20px;
      border-left: 4px solid #d9a74f;
      background: #fffaf0;
      color: #655232 !important;
    }
    @media (max-width: 760px) {
      .page-recall main.shell {
        width: 100%;
        max-width: 100vw;
        overflow-x: hidden;
      }
      .ws2526-index-hero,
      .ws2526-guide-hero,
      .ws2526-guide-page,
      .ws2526-index-grid { min-width: 0; max-width: 100%; }
      .ws2526-guide-page {
        width: 100%;
        overflow-x: hidden;
      }
      .ws2526-guide-page > *,
      .ws2526-guide-hero > *,
      .ws2526-exact-transcript > *,
      .ws2526-actual-commentary > *,
      .ws2526-question-group > * {
        min-width: 0;
        max-width: 100%;
      }
      .ws2526-guide-page p,
      .ws2526-guide-page li,
      .ws2526-guide-page dt,
      .ws2526-guide-page dd,
      .ws2526-guide-page h2,
      .ws2526-guide-page h3,
      .ws2526-guide-page h4 {
        overflow-wrap: anywhere;
        word-break: break-word;
      }
      .ws2526-visual,
      .ws2526-table-scroll,
      .ws2526-original-question pre {
        width: 100%;
        max-width: 100%;
      }
      .ws2526-index-hero h2,
      .ws2526-guide-hero h2 {
        max-width: 100%;
        font-size: 30px;
        overflow-wrap: anywhere;
        word-break: break-word;
      }
      .ws2526-index-hero > p,
      .ws2526-guide-hero > p { max-width: 100%; overflow-wrap: anywhere; }
      .ws2526-index-hero .stats {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        width: 100%;
      }
      .ws2526-index-hero .stat { min-width: 0; }
      .ws2526-guide-callout,
      .ws2526-fixed-method { grid-template-columns: 1fr; }
      .ws2526-learning-loop { padding: 6px; }
      .ws2526-learning-loop iframe { height: 780px; }
      .ws2526-index-grid { grid-template-columns: 1fr; }
      .ws2526-index-card { grid-template-columns: 38px minmax(0, 1fr); padding: 18px 15px; }
      .ws2526-index-card > span { width: 34px; height: 34px; }
      .ws2526-concept-card > div { padding-left: 10px; }
      .ws2526-exact-transcript { padding: 20px 14px; }
      .ws2526-exact-transcript pre,
      .ws2526-original-question pre { padding: 14px; font-size: 12px; }
      .ws2526-term-row {
        grid-template-columns: 1fr;
        gap: 8px;
        padding: 18px 0;
      }
      .ws2526-selection-examples { grid-template-columns: 1fr; }
      .ws2526-subproblem > summary {
        grid-template-columns: 76px minmax(0, 1fr);
        gap: 10px;
      }
      .ws2526-subproblem > summary b { grid-column: 2; justify-self: start; }
      .ws2526-subproblem-body { margin-left: 0; padding: 8px 15px 22px; }
      .ws2526-problem-setup { padding: 20px 15px; }
      .ws2526-setup-columns { grid-template-columns: 1fr; gap: 15px; }
      .ws2526-formula-ledger > ul { grid-template-columns: 1fr; }
      .ws2526-reinforcement { padding: 18px 14px; }
      .ws2526-microtasks { grid-template-columns: 1fr; }
      .ws2526-math-block { font-size: 15px; }
      .ws2526-exact-solution li { grid-template-columns: 52px minmax(0, 1fr); }
      .ws2526-beginner-expansion { padding: 22px 14px; }
      .ws2526-beginner-expansion > header h3 { font-size: 22px; }
      .ws2526-foundation p { font-size: 15px; line-height: 1.84; }
      .ws2526-analogy-map,
      .ws2526-worked-example { padding: 19px 14px; }
      .ws2526-analogy-map ul { grid-template-columns: 1fr; }
      .ws2526-analogy-map li {
        grid-template-columns: 1fr;
        gap: 4px;
      }
      .ws2526-analogy-map li i { transform: rotate(90deg); }
      .ws2526-question-visual { padding: 18px 13px; }
      .ws2526-question-visual.is-compare > ol,
      .ws2526-question-visual.is-table > ol,
      .ws2526-question-visual.is-math > ol,
      .ws2526-question-visual.is-stack > ol,
      .ws2526-question-visual.is-code > ol {
        grid-template-columns: 1fr;
      }
      .ws2526-question-visual.is-flow > ol {
        display: grid;
        grid-template-columns: 1fr;
        min-width: 0;
        gap: 30px;
      }
      .ws2526-question-visual.is-flow > ol > li {
        width: auto;
      }
      .ws2526-question-visual.is-flow > ol > li:not(:last-child)::after {
        content: "↓";
        top: auto;
        right: 50%;
        bottom: -25px;
        transform: translateX(50%);
      }
      .ws2526-example-result,
      .ws2526-answer-expansion { grid-template-columns: 1fr; }
      .ws2526-beginner-sources li { grid-template-columns: 1fr; }
      .ws2526-beginner-sources li a { white-space: normal; }
      .ws2526-quick-check { grid-column: auto; }
    }
    .operation-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px 24px;
      margin-top: 32px;
    }
    .operation-grid article { border-top: 3px solid #8aac9f; padding-top: 13px; }
    .operation-grid h3 { margin: 0; color: #245f52; font-size: 17px; }
    .operation-grid p { margin: 7px 0 0; color: #4b5f56; font-size: 14px; line-height: 1.75; }
    .byte-example {
      display: grid;
      gap: 17px;
      margin-top: 26px;
      overflow-x: auto;
      padding-bottom: 7px;
    }
    .byte-example > div {
      display: grid;
      grid-template-columns: 190px repeat(16, 38px);
      gap: 4px;
      min-width: 860px;
      align-items: center;
    }
    .byte-example strong { color: #365149; font-size: 13px; }
    .byte-example span {
      display: grid;
      width: 36px;
      height: 36px;
      place-items: center;
      border: 1px solid #afbeb8;
      border-radius: 5px;
      background: #e9f0ed;
      color: #28473f;
      font: 700 12px/1 Consolas, monospace;
    }
    .byte-example .pad-byte { border-color: #c18c42; background: #fff0c9; color: #704a14; }
    .mode-overview-diagram { padding-top: 25px; }
    .mode-overview-diagram h2 { padding: 0 28px; }
    .mode-table-wrap { margin-top: 26px; overflow-x: auto; }
    .mode-table {
      width: 100%;
      min-width: 760px;
      border-collapse: collapse;
      color: #344a40;
      font-size: 14px;
    }
    .mode-table th,
    .mode-table td { border: 1px solid #d5ded9; padding: 12px 13px; text-align: left; vertical-align: top; }
    .mode-table thead th { background: #e6f0ec; color: #214f43; }
    .mode-table tbody th { width: 150px; background: #f4f6f4; color: #365149; }
    .answer-script {
      margin-top: 30px;
      border-left: 4px solid #4e77a3;
      padding: 5px 0 5px 19px;
    }
    .answer-script h3 { margin: 0; color: #315b8b; font-size: 17px; }
    .answer-script p { margin: 8px 0 0; color: #40556a; font-size: 15px; line-height: 1.8; }
    .mode-sources {
      border-top: 2px solid #244f45;
      padding-top: 24px;
      color: #5b6d65;
      font-size: 13px;
      line-height: 1.7;
    }
    .mode-sources strong { color: #244f45; }
    .mode-sources p { max-width: 76ch; }
    .mode-sources a { color: #1f6556; font-weight: 800; }
    .deep-term-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 15px;
      margin-top: 25px;
    }
    .deep-term-card {
      border: 1px solid #d5ded9;
      border-radius: 9px;
      background: #fbfcfa;
      padding: 18px;
    }
    .deep-term-card h3 { margin: 0; color: #245f52; font-size: 17px; }
    .deep-term-card p { margin: 8px 0 0; color: #40544b; font-size: 14px; line-height: 1.75; }
    .deep-subconcepts { display: grid; gap: 28px; margin-top: 26px; }
    .deep-subconcept {
      border-top: 3px solid #85a99c;
      padding-top: 18px;
    }
    .deep-subconcept h3 { margin: 5px 0 12px; color: #234e43; font-size: 21px; }
    .deep-subconcept > p:not(.eyebrow) {
      max-width: 76ch;
      margin: 8px 0 0;
      color: #40544b;
      font-size: 15px;
      line-height: 1.8;
    }
    .source-slide {
      margin: 27px 0 19px;
      border: 1px solid #d4ded8;
      border-radius: 11px;
      background: white;
      overflow: hidden;
    }
    .source-slide-scroll {
      max-width: 100%;
      overflow-x: auto;
      background: white;
    }
    .source-slide img {
      display: block;
      width: 100%;
      height: auto;
      background: white;
    }
    .source-slide figcaption {
      border-top: 1px solid #e0e6e2;
      padding: 12px 15px 14px;
      color: #586a62;
      font-size: 12px;
      line-height: 1.65;
    }
    .deep-trap-list {
      display: grid;
      gap: 9px;
      max-width: 76ch;
      margin: 22px 0 0;
      padding-left: 20px;
      color: #5b4937;
      font-size: 14px;
      line-height: 1.7;
    }
    .concept-sequence-nav {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 14px;
      align-items: stretch;
      border-top: 2px solid #244f45;
      margin-top: 48px;
      padding-top: 22px;
    }
    .concept-sequence-nav a {
      display: grid;
      align-items: center;
      min-height: 48px;
      border: 1px solid #d2ddd8;
      border-radius: 8px;
      background: #fbfcfa;
      padding: 10px 13px;
      color: #245f52;
      font-size: 12px;
      font-weight: 800;
      text-decoration: none;
    }
    .concept-sequence-nav a:nth-last-child(1) { text-align: right; }
    .concept-index-group { border-top: 1px solid #d5ded9; margin-top: 48px; padding-top: 32px; }
    .concept-index-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      margin-top: 15px;
    }
    .concept-index-card {
      display: grid;
      grid-template-columns: 42px minmax(0, 1fr);
      gap: 3px 12px;
      border: 1px solid #d5ded9;
      border-radius: 9px;
      background: #fbfcfa;
      padding: 16px;
      color: #234e43;
      text-decoration: none;
    }
    .concept-index-card > span {
      grid-row: 1 / 3;
      color: #6e8f84;
      font: 850 15px/1.4 Consolas, monospace;
    }
    .concept-index-card strong { font-size: 16px; }
    .concept-index-card small { color: #62746c; font-size: 12px; line-height: 1.5; }
    .concept-index-card:hover { border-color: #6e9d8f; background: #f2f7f4; }
    .beginner-primer-definition {
      margin: 0;
      color: #263c4a;
      font-size: 16px !important;
      line-height: 1.9 !important;
    }
    .beginner-primer-analogy {
      margin: 18px 0 0 !important;
      border-left: 4px solid #d89a35;
      background: #fff8e9;
      padding: 14px 16px;
      color: #573a0d;
    }
    .beginner-primer-analogy strong,
    .beginner-primer-trap strong {
      display: block;
      margin-bottom: 5px;
      font-size: 13px;
    }
    .beginner-primer-mechanics {
      margin-top: 18px;
    }
    .beginner-primer-mechanics > p {
      margin: 0;
      color: #31566b;
      font-size: 14px;
      font-weight: 900;
    }
    .beginner-primer-mechanics ol {
      margin: 9px 0 0;
      padding-left: 1.6em;
    }
    .beginner-primer-mechanics li {
      margin-top: 8px;
      padding-left: 4px;
      color: #344b59;
      font-size: 15px;
      line-height: 1.75;
    }
    .beginner-primer-mechanics li::marker {
      color: #317088;
      font-weight: 900;
    }
    .beginner-primer-trap {
      margin: 18px 0 0 !important;
      border-left: 4px solid #c2783d;
      padding: 4px 0 4px 18px;
      color: #6d3d20;
    }
    .beginner-primer-trap h4 { color: #8a4e22; }
    .beginner-primer-trap p {
      max-width: 68ch;
      margin: 7px 0 0;
      font-size: 15px;
      line-height: 1.8;
    }
    .beginner-question-bridge {
      margin-top: 34px;
      border: 1px solid #c9ddd3;
      border-radius: 9px;
      background: #f3faf6;
      padding: 18px 20px;
      color: #284d3a;
    }
    .beginner-question-bridge > strong {
      font-size: 16px;
    }
    .beginner-question-bridge p {
      margin: 7px 0 0;
      font-size: 15px;
      line-height: 1.75;
    }
    .beginner-prose-section {
      margin-top: 34px;
      padding: 0;
    }
    .beginner-prose-section:first-child { margin-top: 0; }
    .beginner-prose-section > h3 {
      margin: 0 0 13px;
      color: #18384f;
      font-size: 21px;
      line-height: 1.4;
      letter-spacing: -0.015em;
      word-break: keep-all;
    }
    .beginner-prose-section p,
    .beginner-prose-list {
      margin: 9px 0 0;
      font-size: 15px;
      line-height: 1.85;
      word-break: keep-all;
      overflow-wrap: anywhere;
    }
    .beginner-prose-list {
      padding-left: 1.35em;
    }
    .beginner-prose-list > li {
      margin-top: 10px;
      padding-left: 4px;
    }
    .beginner-prose-list > li::marker {
      color: #326b83;
      font-weight: 800;
    }
    .beginner-prose-points {
      display: grid;
      gap: 18px;
    }
    .beginner-prose-point {
      padding-left: 16px;
      border-left: 2px solid #d7e3e8;
    }
    .beginner-prose-point h4 {
      margin: 0 0 6px;
      color: #31566b;
      font-size: 15px;
      line-height: 1.5;
      word-break: keep-all;
    }
    .beginner-prose-point p { margin-top: 4px; }
    .beginner-prose-section.is-example,
    .beginner-prose-section.is-exam,
    .beginner-prose-section.is-caution,
    .beginner-prose-section.is-highlight {
      border-radius: 9px;
      padding: 20px;
    }
    .beginner-prose-section.is-example { background: #f4f8fb; }
    .beginner-prose-section.is-exam {
      border: 1px solid #cbded4;
      background: #f3faf6;
    }
    .beginner-prose-section.is-caution {
      border: 1px solid #ecd8c2;
      background: #fff8f2;
    }
    .beginner-prose-section.is-highlight { background: #fff8e9; }
    .beginner-prose-section.is-exam > h3 { color: #24573f; }
    .beginner-prose-section.is-caution > h3 { color: #7a401e; }
    .recall-warning {
      margin-top: 10px;
      border-left: 4px solid var(--warn);
      background: #fff7f1;
      color: #71310f;
      padding: 10px 12px;
      border-radius: 6px;
      font-weight: 700;
    }
    .practice-prompt {
      background: #f8fbff;
      border: 1px solid #c9d9ff;
      border-radius: 8px;
      padding: 12px;
    }
    .recall-runner { box-shadow: 0 8px 24px rgba(26, 43, 57, 0.08); }
    body.recall-focus .recall-runner { position: sticky; top: 8px; z-index: 20; }
    .runner-nav[hidden] { display: none !important; }
    .runner-controls, .runner-nav, .recall-actions, .choice-row, .confidence-row, .toggle-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      align-items: end;
    }
    .runner-controls label, .calc-grid label { display: grid; gap: 5px; font-size: 12px; font-weight: 800; color: var(--ink); }
    .runner-controls select, .calc-grid input, .recall-workbench select, .recall-workbench textarea {
      min-height: 38px;
      border: 1px solid #b8c7d4;
      border-radius: 6px;
      background: white;
      color: var(--ink);
      padding: 8px 10px;
      font: inherit;
    }
    .recall-workbench textarea { width: 100%; resize: vertical; }
    .runner-controls button, .runner-nav button, .runner-progress button, .recall-actions button, .recall-workbench button, .hint-controls button {
      min-height: 38px;
      border: 1px solid #b9cdf8;
      border-radius: 6px;
      background: #fff;
      color: #183b73;
      padding: 8px 11px;
      font-weight: 800;
      cursor: pointer;
    }
    .runner-controls button, .runner-nav button[data-runner-next], .recall-workbench button.is-correct {
      background: #2057b8;
      color: white;
      border-color: #2057b8;
    }
    .recall-workbench button.is-wrong { background: #fff1ec; color: #8a2e19; border-color: #dc8068; }
    .runner-check { display: flex !important; align-items: center; min-height: 38px; }
    .runner-nav { margin-top: 12px; align-items: center; }
    .runner-progress { margin-top: 12px; display: grid; grid-template-columns: auto minmax(120px, 1fr) auto; align-items: center; gap: 10px; font-size: 12px; font-weight: 800; }
    .runner-progress > div { height: 10px; border-radius: 999px; background: #e7edf2; overflow: hidden; }
    .runner-progress i { display: block; width: 0; height: 100%; background: var(--accent); transition: width .2s ease; }
    body.recall-focus .recall-section > .panel, body.recall-focus .recall-section > .panel + .panel, body.recall-focus .band:not(.recall-section), body.recall-focus .recall-hero { display: none; }
    body.recall-focus .recall-item { display: none; }
    body.recall-focus .recall-item.focus-active { display: block; }
    body.recall-focus .recall-section { margin-top: 12px; }
    .recall-item[data-study-state="correct"] { border-left-color: #238457; }
    .recall-item[data-study-state="partial"] { border-left-color: #d49a17; }
    .recall-item[data-study-state="retry"] { border-left-color: #c44d33; }
    .recall-actions { margin-top: 10px; }
    .recall-actions button.is-active { background: #183b73; border-color: #183b73; color: white; }
    .hint-controls { display: flex; align-items: center; gap: 10px; }
    .progressive-hints li[hidden] { display: none; }
    .recall-workbench {
      margin-top: 14px;
      border: 1px solid #c9d9ff;
      border-left: 4px solid var(--blue);
      border-radius: 8px;
      background: #f8fbff;
      padding: 14px;
      display: grid;
      gap: 12px;
    }
    .recall-workbench h4 { margin: 0; font-size: 16px; }
    .workbench-output, .recall-slot-output, .route-result {
      margin: 0;
      border-left: 4px solid var(--accent);
      border-radius: 6px;
      background: #effaf4;
      color: #183f2b;
      padding: 10px 12px;
      font-weight: 700;
    }
    .choice-row button { flex: 1 1 150px; text-align: center; }
    .confidence-row { border: 0; margin: 0; padding: 0; }
    .confidence-row legend { width: 100%; font-size: 12px; font-weight: 800; }
    .confidence-row label, .toggle-grid label { border: 1px solid var(--line); border-radius: 6px; background: white; padding: 8px 10px; }
    .diagram-flow { display: flex; flex-wrap: wrap; gap: 8px; align-items: stretch; }
    .diagram-flow span, .diagram-flow b { min-height: 48px; border: 1px solid var(--line); border-radius: 6px; background: white; padding: 8px 12px; display: grid; place-items: center; text-align: center; }
    .diagram-flow span { flex: 1 1 110px; color: var(--ink); }
    .diagram-flow b { flex: 0 1 auto; background: #eef4ff; color: #1d4d91; font-size: 12px; }
    .calc-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
    .recall-diagram { width: 100%; height: auto; min-height: 180px; display: block; border: 1px solid var(--line); border-radius: 8px; background: white; color: #617287; }
    .recall-diagram .diagram-node rect { stroke: #617287; stroke-width: 1.5; }
    .recall-diagram .diagram-node text { text-anchor: middle; fill: #142536; font-size: 16px; font-weight: 800; }
    .recall-diagram .diagram-node.honest rect { fill: #d9f2ee; }
    .recall-diagram .diagram-node.risk rect { fill: #fee1d7; }
    .recall-diagram .diagram-node.external rect { fill: #fff0bd; }
    .recall-diagram .diagram-small { font-size: 12px !important; font-weight: 600 !important; }
    .recall-diagram .diagram-label { fill: #44596d; font-size: 12px; font-weight: 700; }
    .recall-diagram .risk-text { fill: #9a3f27; }
    .sequence-answer { min-height: 44px; border: 1px dashed #8ca0b2; border-radius: 6px; background: white; padding: 10px; }
    .order-grid { display: grid; gap: 7px; }
    .order-row { display: grid; grid-template-columns: 42px 1fr; gap: 8px; align-items: center; }
    .order-row strong { display: grid; place-items: center; min-height: 38px; border-radius: 6px; background: #eef4ff; color: #1d4d91; }
    .order-row select { width: 100%; }
    .dhcp-grid { display: grid; gap: 10px; }
    .dhcp-row { display: grid; grid-template-columns: 38px repeat(4, minmax(150px, 1fr)); gap: 8px; align-items: end; border: 1px solid var(--line); border-radius: 6px; background: white; padding: 10px; }
    .dhcp-row > strong { align-self: center; color: var(--blue); text-align: center; }
    .dhcp-row label { display: grid; gap: 4px; min-width: 0; font-size: 11px; font-weight: 800; }
    .dhcp-row select { width: 100%; min-width: 0; }
    .code-audit { display: grid; gap: 5px; font-family: Consolas, monospace; }
    .code-line { display: grid !important; grid-template-columns: 34px 1fr; gap: 8px; width: 100%; text-align: left; background: #172536 !important; color: #f1f5f9 !important; border-color: #35495f !important; }
    .code-line span { color: #8fb8ff; }
    .code-line.is-correct { outline: 3px solid #4fb985; }
    .recall-slot-check { margin-top: 12px; }
    .recall-slot-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 7px; }
    .recall-slot { display: grid; grid-template-columns: 20px 1fr; gap: 7px; border: 1px solid var(--line); border-radius: 6px; background: white; padding: 9px; font-size: 12px; }
    .custody-list { display: grid; gap: 6px; padding: 0; list-style: none; counter-reset: custody; }
    .custody-list li { display: grid; grid-template-columns: 1fr 38px 38px; gap: 6px; align-items: center; border: 1px solid var(--line); border-radius: 6px; background: white; padding: 8px; counter-increment: custody; }
    .custody-list li span::before { content: counter(custody) ". "; color: var(--blue); font-weight: 800; }
    .custody-list button { padding: 4px; min-height: 32px; }
    @media (max-width: 760px) {
      .topbar { align-items: flex-start; flex-direction: column; }
      .shell { width: 100%; max-width: 1180px; padding: 0 14px; }
      h1 { font-size: 30px; }
      h2 { font-size: 20px; word-break: break-all; }
      h3 { word-break: break-all; }
      .meta { gap: 6px; }
      .meta .pill { flex: 1 1 100%; justify-content: center; min-width: 0; padding-inline: 8px; text-align: center; word-break: break-word; }
      .concept, .panel, .section-card, .topic-card { overflow: hidden; }
      .packet-table { table-layout: auto; display: block; overflow-x: auto; }
      .as-map { grid-template-columns: 1fr; }
      .interactive-stage { grid-template-columns: 1fr; }
      .state-arrow { min-height: 32px; }
      .control-row button { flex: 1 1 100%; text-align: center; }
      .score-list { grid-template-columns: 1fr; }
      .recall-kv { grid-template-columns: 1fr; }
      .beginner-blog { padding: 22px 16px 28px; }
      .beginner-blog-header h2 { font-size: 25px; }
      .beginner-zero-primer-head h3 { font-size: 21px; }
      .beginner-primer-concept > h3 { font-size: 19px; }
      .beginner-primer-definition { font-size: 15px !important; }
      .beginner-question-bridge { padding: 16px; }
      .beginner-prose-section { margin-top: 28px; }
      .beginner-prose-section > h3 { font-size: 19px; }
      .beginner-prose-section.is-example,
      .beginner-prose-section.is-exam,
      .beginner-prose-section.is-caution,
      .beginner-prose-section.is-highlight { padding: 16px; }
      .recall-runner { position: static; }
      .runner-progress { grid-template-columns: 1fr; }
      .runner-controls > *, .runner-nav button { flex: 1 1 100%; width: 100%; }
      .recall-actions button { flex: 1 1 100%; }
      .diagram-flow b { flex: 1 1 100%; min-height: 32px; }
      .recall-diagram { min-width: 620px; }
      .recall-workbench { overflow-x: auto; }
      .dhcp-row { grid-template-columns: 34px minmax(210px, 1fr); }
      .dhcp-row > strong { grid-row: 1 / 5; }
    }

    /* Editorial learning-hub refresh: clearer hierarchy, calmer surfaces, and
       a narrower reading rail without changing the generated study content. */
    :root {
      --ink: #17212b;
      --muted: #596777;
      --line: #dce3e8;
      --paper: #ffffff;
      --soft: #f5f7f8;
      --accent: #087f72;
      --accent-strong: #05665d;
      --accent-soft: #e9f6f3;
      --blue: #245ea8;
      --warn: #a64b16;
      --shadow-sm: 0 1px 2px rgba(23, 33, 43, 0.05), 0 8px 24px rgba(23, 33, 43, 0.04);
      --shadow-md: 0 2px 4px rgba(23, 33, 43, 0.06), 0 18px 42px rgba(23, 33, 43, 0.07);
    }
    body {
      background: #f4f6f7;
      font-size: 16px;
      line-height: 1.7;
      text-rendering: optimizeLegibility;
    }
    a, button, summary { transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease; }
    a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, select:focus-visible {
      outline: 3px solid rgba(36, 94, 168, 0.28);
      outline-offset: 3px;
    }
    .shell { max-width: 1220px; padding-inline: 24px; }
    header {
      background: var(--paper);
      border-bottom: 1px solid var(--line);
      box-shadow: 0 1px 0 rgba(23, 33, 43, 0.02);
    }
    .topbar { min-height: 64px; padding-block: 14px; }
    .brand { color: #183f3b; font-size: 16px; letter-spacing: -0.01em; }
    .back {
      border: 1px solid #cdd9df;
      border-radius: 999px;
      padding: 6px 12px;
      color: #28485f;
      font-size: 13px;
    }
    .back:hover { background: #f2f7f8; border-color: #aebfc8; }
    .hero { padding-block: 42px 38px; }
    .hero h1 { letter-spacing: -0.035em; }
    .hero > p:not(.eyebrow) { max-width: 720px; font-size: 17px; }
    .hero .meta { margin-top: 22px; }
    .eyebrow { letter-spacing: 0.075em; }
    h2 { letter-spacing: -0.025em; }
    h3 { letter-spacing: -0.018em; }
    main { padding-block: 42px 88px; }
    .band { margin-top: 48px; }
    .band > h2 { margin-bottom: 18px; }
    .panel, .section-card, .concept, .topic-card, .route-card, .visual-card, .mock-card {
      border-color: var(--line);
      box-shadow: var(--shadow-sm);
    }
    .panel, .section-card, .topic-card { border-radius: 12px; }
    .route-card, .visual-card, .mock-card { border-radius: 10px; }
    .panel { padding: 24px; }
    .section-card { padding: 22px; }
    .section-card, .topic-card, .visual-card, .mock-card { position: relative; }
    .section-card:hover, .visual-card:hover, .mock-card:hover {
      border-color: #b9c8cf;
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .pill {
      border-color: #cedbe1;
      background: #f7fafb;
      color: #244558;
      font-weight: 700;
    }
    .hero .pill { background: #ffffff; }
    .hero .pill:hover { background: var(--accent-soft); border-color: #abd3cb; color: #075f57; }
    .button {
      border-radius: 8px;
      background: var(--accent);
      box-shadow: 0 1px 2px rgba(5, 102, 93, 0.18);
    }
    .button:hover { background: var(--accent-strong); transform: translateY(-1px); }
    .notice { border-radius: 8px; background: var(--accent-soft); border-left-color: var(--accent); }
    .stat { background: #f8fafb; border-radius: 8px; }
    .stat strong { letter-spacing: -0.03em; }
    .scan-flow li, .practice-grid > div, .bridge-grid > div, .mini-lesson, .trap-list {
      border-color: #dce4e8;
      border-radius: 8px;
    }
    .commands pre, .schema-grid pre, .prompt-box {
      border: 1px solid #283746;
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
    }

    /* Home behaves like a course landing page: routes lead, operational data recedes. */
    .page-home .hero { padding-bottom: 44px; }
    .page-home main > .panel:first-child {
      border: 0;
      border-left: 4px solid var(--accent);
      padding: 20px 22px;
      box-shadow: var(--shadow-sm);
    }
    .page-home main > .panel:first-child h2 { font-size: 18px; margin-bottom: 8px; }
    .page-home main > .panel:first-child .notice {
      margin: 0;
      padding: 0;
      border: 0;
      background: transparent;
    }
    .page-home .route-grid { grid-template-columns: 1.15fr 1fr 1fr; gap: 16px; }
    .page-home .route-card:first-child {
      background: linear-gradient(145deg, #087f72, #075f59);
      border-color: #075f59;
      color: white;
      box-shadow: 0 18px 38px rgba(8, 127, 114, 0.18);
    }
    .page-home .route-card:first-child p,
    .page-home .route-card:first-child code { color: #e8fffa; }
    .page-home .route-card:first-child .eyebrow { color: #bbf0e7; }
    .page-home .visual-grid, .page-home .mock-grid { gap: 16px; }
    .page-home .visual-card { background: #fbfcfc; }
    .page-home .mock-card { border-top: 3px solid #d7e4e8; }
    .page-home .section-card .button { margin-top: auto; }
    .page-home .section-card { display: flex; flex-direction: column; min-height: 270px; }
    .page-home .section-card .meta { margin-bottom: 16px; }
    .page-home .topic-card { box-shadow: none; background: #fafbfc; }
    .page-home .profile {
      max-height: 320px;
      overflow: auto;
      mask-image: linear-gradient(to bottom, #000 84%, transparent 100%);
    }
    .page-home main > .band.grid .panel,
    .page-home main > .band.panel:last-child { background: #fafbfc; box-shadow: none; }

    /* Section pages read like articles instead of stacked dashboard widgets. */
    .page-section main { max-width: 1040px; }
    .page-section main > .panel {
      max-width: 820px;
      margin-inline: auto;
      background: var(--accent-soft);
      border-color: #c8e3dd;
      box-shadow: none;
    }
    .page-section .concept {
      max-width: 820px;
      margin: 32px auto 0;
      padding: 38px 42px 44px;
      border-radius: 14px;
      box-shadow: var(--shadow-md);
    }
    .page-section .concept-head { padding-bottom: 18px; margin-bottom: 20px; }
    .page-section .concept-head h2 { font-size: clamp(26px, 4vw, 34px); line-height: 1.22; }
    .page-section .concept > .lead { font-size: 18px; line-height: 1.65; }
    .page-section .concept p,
    .page-section .concept li { max-width: 72ch; }
    .page-section .lecture-flow { gap: 26px; margin-top: 28px; }
    .page-section .lecture-block { padding-top: 24px; }
    .page-section .lecture-block h3 { font-size: 20px; }
    .page-section .answer-frame,
    .page-section .trap-note,
    .page-section .analogy,
    .page-section .beginner-bridge { padding: 16px 18px; }
    .page-section .source-list,
    .page-section details,
    .page-section .prompt-box { font-size: 13px; }
    .page-section .prompt-box { max-height: 220px; overflow: auto; }
    .page-section details {
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 10px 12px;
      background: #f8fafb;
    }
    .page-section details[open] { padding-bottom: 14px; }

    /* Recall exam: editorial index, small chapters, and one-question articles. */
    .page-recall {
      --recall-ink: #18241f;
      --recall-muted: #596861;
      --recall-paper: #fffefb;
      --recall-wash: #f3f1e9;
      --recall-green: #176b5b;
      --recall-green-soft: #e6f2ed;
      background: #f3f1eb;
      color: var(--recall-ink);
    }
    .page-recall header { background: #fffefb; }
    .page-recall .hero { padding-block: 30px 28px; }
    .page-recall .hero h1 { max-width: 760px; font-size: clamp(32px, 4vw, 48px); }
    .page-recall main { max-width: 1160px; }
    .page-recall p { color: var(--recall-muted); }
    .quiet-button {
      display: inline-flex;
      min-height: 42px;
      align-items: center;
      justify-content: center;
      border: 1px solid #c8d2cc;
      border-radius: 8px;
      background: transparent;
      color: #24463d;
      padding: 8px 14px;
      text-decoration: none;
      font-weight: 800;
    }
    .text-link {
      display: inline-flex;
      gap: 6px;
      margin-top: 16px;
      color: var(--recall-green);
      text-decoration: none;
      font-weight: 800;
    }
    .recall-dashboard {
      display: grid;
      grid-template-columns: minmax(0, 1.4fr) minmax(280px, .6fr);
      gap: 36px;
      align-items: center;
      border-radius: 18px;
      background: linear-gradient(135deg, #164f45, #1b7563);
      padding: 44px 48px;
      color: white;
      box-shadow: 0 22px 54px rgba(23, 75, 64, .18);
    }
    .recall-dashboard h2 { max-width: 580px; font-size: clamp(28px, 4vw, 42px); line-height: 1.15; }
    .recall-dashboard p { max-width: 620px; color: #dff3ed; font-size: 17px; }
    .recall-dashboard .eyebrow { color: #bce6db; }
    .recall-primary-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
    .recall-dashboard .button { border: 1px solid white; background: white; color: #155247; cursor: pointer; }
    .recall-dashboard .quiet-button { border-color: rgba(255,255,255,.5); color: white; }
    .recall-progress-card {
      display: flex;
      gap: 18px;
      align-items: center;
      border: 1px solid rgba(255,255,255,.24);
      border-radius: 14px;
      background: rgba(255,255,255,.1);
      padding: 20px;
      backdrop-filter: blur(8px);
    }
    .recall-progress-card p { margin-top: 2px; font-size: 13px; }
    .recall-progress-ring {
      display: grid;
      width: 82px;
      height: 82px;
      flex: 0 0 82px;
      place-content: center;
      border: 7px solid rgba(255,255,255,.25);
      border-top-color: white;
      border-radius: 50%;
      text-align: center;
      line-height: 1.05;
    }
    .recall-progress-ring strong { font-size: 24px; }
    .recall-progress-ring span { font-size: 11px; }
    .recall-editor-note {
      display: grid;
      grid-template-columns: 150px 1fr;
      gap: 24px;
      margin-top: 22px;
      border-left: 3px solid #9b7d42;
      background: #faf7ed;
      padding: 16px 20px;
    }
    .recall-editor-note p { margin: 0; }
    .recall-four-chapters {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
      margin-top: 30px;
    }
    .recall-chapter-jump {
      display: grid;
      min-height: 130px;
      align-content: start;
      border: 1px solid #d5dcd7;
      border-top: 4px solid var(--recall-green);
      border-radius: 10px;
      background: var(--recall-paper);
      padding: 16px;
      color: var(--recall-ink);
      text-decoration: none;
    }
    .recall-chapter-jump span { color: #65756d; font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; }
    .recall-chapter-jump strong { margin-top: 6px; font-size: 18px; }
    .recall-chapter-jump small { margin-top: auto; color: var(--recall-muted); font-weight: 700; }
    .recall-chapter-jump:hover { border-color: #8db4a9; box-shadow: var(--shadow-sm); transform: translateY(-2px); }
    .recall-quick-start {
      display: grid;
      grid-template-columns: minmax(220px, .45fr) 1fr;
      gap: 30px;
      align-items: end;
      margin-top: 54px;
      border-block: 1px solid #d9ddd8;
      padding-block: 26px;
    }
    .recall-quick-start .runner-controls { justify-content: flex-end; }
    .recall-chapter-content { margin-top: 64px; }
    .recall-exam-chapter {
      max-width: 980px;
      margin: 0 auto;
      padding-top: 30px;
      scroll-margin-top: 20px;
    }
    .recall-exam-chapter + .recall-exam-chapter { margin-top: 78px; border-top: 1px solid #cfd7d1; }
    .recall-exam-chapter-head {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 28px;
      align-items: end;
      margin-bottom: 20px;
    }
    .recall-exam-chapter-head h2 { font-size: clamp(30px, 4vw, 42px); }
    .recall-exam-chapter-head > strong { color: #54665e; font-size: 14px; }
    .recall-mc-lead {
      display: grid;
      grid-template-columns: 220px 1fr;
      gap: 24px;
      align-items: center;
      border-radius: 10px;
      background: #e7f1ed;
      padding: 17px 20px;
    }
    .recall-mc-lead > div { display: flex; gap: 10px; align-items: center; color: #174f44; }
    .recall-mc-lead > div span { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 50%; background: #176b5b; color: white; font-size: 11px; font-weight: 800; }
    .recall-mc-lead p { margin: 0; font-size: 13px; }
    .recall-mc-lead.is-missing { border: 1px solid #e1c992; background: #fff8e8; }
    .recall-mc-lead.is-missing > div { color: #72520f; }
    .recall-mc-lead.is-missing > div span { background: #9b741f; }
    .recall-chapter-lecture {
      margin-top: 22px;
      padding: 30px 0;
    }
    .recall-lecture-head {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 24px;
      align-items: start;
    }
    .recall-lecture-head h3 { max-width: 760px; font-size: 24px; line-height: 1.4; }
    .recall-lecture-head > span {
      border-radius: 999px;
      background: #e7f1ed;
      padding: 6px 10px;
      color: #28594d;
      font-size: 11px;
      font-weight: 800;
      white-space: nowrap;
    }
    .recall-lecture-foundation {
      margin-top: 22px;
      border-left: 4px solid var(--recall-green);
      padding: 4px 0 4px 20px;
    }
    .recall-lecture-foundation > strong { color: #174f44; font-size: 15px; }
    .recall-lecture-foundation p { max-width: 72ch; margin-top: 7px; color: #334a41; font-size: 16px; line-height: 1.85; }
    .recall-lecture-concepts { max-width: 860px; margin: 42px auto 0; }
    .recall-lecture-concept {
      margin-top: 14px;
      border: 1px solid #d5ded9;
      border-radius: 12px;
      background: #fffefa;
      box-shadow: 0 5px 18px rgba(32, 49, 41, .035);
      overflow: hidden;
    }
    .recall-lecture-concept-heading {
      display: grid;
      grid-template-columns: 36px minmax(0, 1fr) 24px;
      gap: 16px;
      align-items: center;
      min-height: 76px;
      padding: 16px 20px;
      color: #203d35;
      cursor: pointer;
      list-style: none;
    }
    .recall-lecture-concept-heading::-webkit-details-marker { display: none; }
    .recall-lecture-concept-heading::after {
      content: "+";
      grid-column: 3;
      color: #477267;
      font-size: 23px;
      line-height: 1;
    }
    .recall-lecture-concept[open] .recall-lecture-concept-heading::after { content: "−"; }
    .recall-lecture-concept-heading > span:first-child {
      color: #66756e;
      font: 800 13px/1.4 Consolas, monospace;
    }
    .recall-lecture-concept-title strong,
    .recall-lecture-concept-title small {
      display: block;
    }
    .recall-lecture-concept-title strong {
      color: #173f36;
      font-size: 19px;
      line-height: 1.35;
    }
    .recall-lecture-concept-title small {
      margin-top: 5px;
      color: #65766f;
      font-size: 13px;
      line-height: 1.65;
    }
    .recall-lecture-concept-body {
      border-top: 1px solid #e2e8e4;
      padding: 34px 42px 46px 72px;
    }
    .recall-lecture-concept-body p {
      max-width: 70ch;
      margin: 10px 0 0;
      color: #34473f;
      font-size: 16px;
      line-height: 1.9;
    }
    .lecture-masterclass {
      border-left: 4px solid #31766a;
      padding-left: 20px;
    }
    .lecture-masterclass > h4,
    .lecture-prose-part > h4 {
      margin: 0 0 12px;
      color: #1d5145;
      font-size: 20px;
      line-height: 1.45;
    }
    .lecture-teacher-lesson { margin-top: 26px; }
    .lecture-teacher-lesson h5,
    .lecture-prose-entry h5,
    .lecture-answer-sequence h5 {
      margin: 0 0 7px;
      color: #234f45;
      font-size: 16px;
      line-height: 1.5;
    }
    .lecture-teacher-lesson p strong { color: #214e43; }
    .lecture-prose-part {
      margin-top: 40px;
    }
    .lecture-prose-part + .lecture-prose-part {
      border-top: 1px solid #e1e6e3;
      padding-top: 34px;
    }
    .lecture-prose-part > h4 {
      color: #203d35;
    }
    .lecture-prose-trap > h4 { color: #8a541f; }
    .lecture-prose-exam > h4 { color: #315b8b; }
    .lecture-guide {
      color: #687a72 !important;
      font-size: 14px !important;
    }
    .lecture-prose-entries { margin-top: 24px; }
    .lecture-prose-entry + .lecture-prose-entry {
      margin-top: 26px;
    }
    .lecture-answer-template {
      border-left: 3px solid #557da8;
      padding-left: 16px;
    }
    .lecture-answer-template strong { color: #315b8b; }
    .lecture-answer-sequences { margin-top: 26px; }
    .lecture-answer-sequence + .lecture-answer-sequence { margin-top: 26px; }
    .lecture-answer-sequence ol {
      margin: 10px 0 0;
      padding-left: 1.5em;
      color: #40534b;
      font-size: 15px;
      line-height: 1.8;
    }
    .lecture-answer-sequence li + li { margin-top: 6px; }
    .recall-lecture-solve { margin-top: 28px; }
    .recall-lecture-solve h4 { margin: 0 0 12px; font-size: 17px; }
    .recall-lecture-solve ol {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
      margin: 0;
      padding: 0;
      list-style: none;
    }
    .recall-lecture-solve li { display: grid; grid-template-columns: 30px 1fr; gap: 10px; align-items: start; border-radius: 8px; background: #f4f5f2; padding: 12px; }
    .recall-lecture-solve li span { display: grid; width: 28px; height: 28px; place-items: center; border-radius: 50%; background: #244f45; color: white; font-size: 11px; font-weight: 800; }
    .recall-lecture-solve li p { margin: 1px 0 0; color: #40534b; font-size: 13px; }
    .recall-lecture-source { margin-top: 18px; border-top: 1px dashed #cbd5cf; padding-top: 14px; font-size: 12px; }
    .section-heading {
      display: flex;
      gap: 32px;
      justify-content: space-between;
      align-items: end;
      margin-bottom: 22px;
    }
    .section-heading p { max-width: 440px; }
    .recall-chapter-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .recall-chapter-card {
      min-height: 210px;
      border: 1px solid #d8ded9;
      border-radius: 12px;
      background: var(--recall-paper);
      padding: 22px;
      box-shadow: 0 8px 22px rgba(39, 51, 45, .04);
    }
    .recall-chapter-card h3 { font-size: 20px; line-height: 1.3; }
    .recall-chapter-card h3 a { text-decoration: none; }
    .recall-chapter-card[data-domain="Krypto"] { border-top: 4px solid #356b9a; }
    .recall-chapter-card[data-domain="Networking"] { border-top: 4px solid #2c8073; }
    .recall-chapter-card[data-domain="Web / Software"] { border-top: 4px solid #8b5b9d; }
    .recall-chapter-card[data-domain="Forensik"] { border-top: 4px solid #9b6d37; }
    .recall-index-data { display: none; }
    .recall-breadcrumb {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 26px;
      color: #5b6a63;
      font-size: 13px;
    }
    .recall-breadcrumb a { color: var(--recall-green); }
    .recall-chapter-intro {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 32px;
      align-items: end;
      border-bottom: 1px solid #d5dbd6;
      padding: 12px 0 30px;
    }
    .recall-chapter-intro h2 { font-size: clamp(30px, 4vw, 44px); }
    .recall-chapter-intro > div:first-child p { max-width: 680px; font-size: 17px; }
    .recall-chapter-summary { display: grid; grid-template-columns: auto auto; gap: 2px 12px; align-items: baseline; }
    .recall-chapter-summary strong { font-size: 24px; }
    .recall-story-list { max-width: 900px; margin: 40px auto 0; }
    .recall-story-card {
      display: grid;
      grid-template-columns: 54px minmax(0, 1fr) auto;
      gap: 22px;
      align-items: start;
      border-bottom: 1px solid #d8ddd9;
      padding: 28px 4px;
    }
    .recall-story-index { color: #89968f; font: 700 13px/1.4 Consolas, monospace; }
    .recall-story-card h2 { margin-top: 10px; font-size: 21px; line-height: 1.45; }
    .recall-story-card h2 a { text-decoration: none; }
    .recall-story-card > div > p { max-width: 72ch; font-size: 14px; }
    .recall-story-state {
      border-radius: 999px;
      background: #e9edea;
      padding: 5px 9px;
      color: #596861;
      font-size: 11px;
      font-weight: 800;
      white-space: nowrap;
    }
    .recall-story-card[data-study-state="correct"] .recall-story-state { background: #dff2e9; color: #176447; }
    .recall-story-card[data-study-state="partial"] .recall-story-state { background: #fff1c9; color: #765500; }
    .recall-story-card[data-study-state="retry"] .recall-story-state { background: #fde4dc; color: #8b3823; }
    .recall-reading-layout {
      display: grid;
      grid-template-columns: 230px minmax(0, 760px);
      gap: 46px;
      justify-content: center;
      align-items: start;
    }
    .recall-reading-rail { position: sticky; top: 20px; padding-top: 14px; }
    .recall-reading-rail > strong { display: block; font-size: 16px; line-height: 1.4; }
    .recall-reading-rail .runner-progress { grid-template-columns: 1fr; margin: 22px 0; }
    .recall-reading-main { min-width: 0; }
    .recall-item.recall-article {
      border: 0;
      border-radius: 14px;
      background: var(--recall-paper);
      padding: 46px 50px 52px;
      box-shadow: 0 16px 42px rgba(35, 48, 41, .08);
    }
    .recall-article > .concept-head { border-bottom: 1px solid #dce1dd; padding-bottom: 16px; }
    .recall-article > .concept-head h2 { font-size: 34px; }
    .recall-article > .meta { margin-top: 14px; }
    .recall-article .pill { font-size: 11px; }
    .recall-prompt {
      margin-top: 34px;
      border: 0;
      border-radius: 10px;
      background: #f5f2e9;
      padding: 24px 26px;
    }
    .recall-prompt h3 { margin-top: 22px; color: #27483f; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; }
    .recall-prompt h3:first-child { margin-top: 0; }
    .recall-prompt p { color: #25332d; font-size: 18px; line-height: 1.75; }
    .recall-article .recall-workbench { margin-top: 28px; border: 0; border-radius: 10px; background: #edf4f1; padding: 22px; }
    .recall-hints { margin-top: 34px; padding-top: 24px; }
    .recall-hints h3, .recall-evidence h3 { font-size: 19px; }
    .recall-article details {
      margin-top: 18px;
      border: 1px solid #d7ded9;
      border-left: 0;
      border-radius: 8px;
      background: #fff;
      padding: 14px 16px;
    }
    .recall-article details summary { cursor: pointer; color: #244e44; font-size: 15px; }
    .recall-article details[open] summary { margin-bottom: 16px; }
    .recall-evidence { margin-top: 38px; border-top: 1px solid #dce1dd; background: #faf9f5; padding: 24px; font-size: 13px; }
    .recall-evidence .source-list { padding-left: 0; }
    .recall-self-grade {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 24px;
      align-items: center;
      margin-top: 36px;
      border-radius: 10px;
      background: #173f37;
      padding: 22px;
      color: white;
    }
    .recall-self-grade .eyebrow { color: #a6d9cc; }
    .recall-self-grade h3 { font-size: 18px; }
    .recall-self-grade .recall-actions { margin: 0; }
    .recall-self-grade .recall-actions button { border-color: rgba(255,255,255,.45); background: transparent; color: white; }
    .recall-self-grade .recall-actions button.is-active { background: white; color: #173f37; }
    .recall-article-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; }
    .recall-article-nav a {
      display: grid;
      min-height: 84px;
      border: 1px solid #d5dcd7;
      border-radius: 10px;
      background: var(--recall-paper);
      padding: 14px 16px;
      color: #244e44;
      text-decoration: none;
    }
    .recall-article-nav a:last-child { text-align: right; }
    .recall-article-nav span { color: #718078; font-size: 12px; }
    .recall-mobile-bar { display: none; }

    @media (max-width: 900px) {
      .page-home .route-grid { grid-template-columns: 1fr; }
      .page-home .route-card:first-child { min-height: auto; }
      .recall-dashboard { grid-template-columns: 1fr; }
      .recall-four-chapters { grid-template-columns: repeat(2, 1fr); }
      .recall-chapter-grid { grid-template-columns: repeat(2, 1fr); }
      .recall-reading-layout { grid-template-columns: 1fr; }
      .recall-reading-rail { position: static; display: none; }
    }
    @media (max-width: 760px) {
      body { font-size: 15px; line-height: 1.68; }
      .shell { padding-inline: 16px; }
      .topbar { min-height: 56px; flex-direction: row; align-items: center; }
      .hero { padding-block: 28px 24px; }
      .hero h1 { font-size: 31px; line-height: 1.14; }
      .hero > p:not(.eyebrow) { font-size: 15px; }
      .hero .meta {
        display: flex;
        flex-wrap: nowrap;
        gap: 8px;
        margin-inline: -16px;
        padding: 2px 16px 8px;
        overflow-x: auto;
        overscroll-behavior-inline: contain;
        scrollbar-width: none;
      }
      .hero .meta::-webkit-scrollbar { display: none; }
      .hero .meta .pill {
        flex: 0 0 auto;
        width: auto;
        min-width: max-content;
        padding-inline: 12px;
      }
      main { padding-block: 26px 64px; }
      .band { margin-top: 36px; }
      .panel, .section-card, .topic-card { padding: 18px; }
      .page-home main > .panel:first-child { padding: 18px; }
      .page-home .stats { display: grid; grid-template-columns: 1fr 1fr; }
      .page-home .stat { min-width: 0; }
      .page-home .section-card { min-height: auto; }
      .page-section main { padding-inline: 12px; }
      .page-section main > .panel { border-radius: 10px; padding: 16px; }
      .page-section .concept {
        margin-top: 22px;
        padding: 24px 18px 30px;
        border-radius: 10px;
      }
      .page-section .concept-head h2 { font-size: 25px; word-break: keep-all; }
      .page-section .concept > .lead { font-size: 16px; }
      .page-section .lecture-flow { gap: 22px; }
      .page-section .lecture-block { padding-top: 20px; }
      .page-section .lecture-block h3 { font-size: 18px; word-break: keep-all; }
      .page-section .practice-grid { grid-template-columns: 1fr; }
      .page-section .prompt-box { max-height: 180px; }
      .page-recall main { padding-inline: 14px; }
      .page-recall .hero .meta { display: none; }
      .recall-dashboard { gap: 26px; border-radius: 12px; padding: 28px 22px; }
      .recall-dashboard p { font-size: 15px; }
      .recall-progress-card { padding: 15px; }
      .recall-progress-ring { width: 70px; height: 70px; flex-basis: 70px; }
      .recall-editor-note { grid-template-columns: 1fr; gap: 4px; }
      .recall-quick-start { grid-template-columns: 1fr; gap: 18px; margin-top: 36px; }
      .recall-quick-start .runner-controls { justify-content: stretch; }
      .section-heading { display: block; }
      .recall-four-chapters { gap: 8px; margin-top: 22px; }
      .recall-chapter-jump { min-height: 112px; padding: 13px; }
      .recall-chapter-jump strong { font-size: 15px; }
      .recall-chapter-content { margin-top: 42px; }
      .recall-exam-chapter { padding-top: 20px; }
      .recall-exam-chapter + .recall-exam-chapter { margin-top: 56px; }
      .recall-exam-chapter-head { grid-template-columns: 1fr; gap: 6px; }
      .recall-exam-chapter-head h2 { font-size: 28px; }
      .recall-mc-lead { grid-template-columns: 1fr; gap: 8px; padding: 15px; }
      .recall-chapter-lecture { padding: 20px 0; }
      .recall-lecture-head { grid-template-columns: 1fr; gap: 10px; }
      .recall-lecture-head h3 { font-size: 20px; }
      .recall-lecture-head > span { justify-self: start; }
      .recall-lecture-foundation { padding: 4px 0 4px 16px; }
      .recall-lecture-concept { margin-top: 10px; }
      .recall-lecture-concept-heading {
        grid-template-columns: 26px minmax(0, 1fr) 20px;
        gap: 9px;
        min-height: 68px;
        padding: 13px 14px;
      }
      .recall-lecture-concept-title strong { font-size: 17px; }
      .recall-lecture-concept-body { padding: 26px 18px 34px; }
      .concept-diagram { margin: 20px 0 25px; border-radius: 8px; }
      .concept-diagram iframe { height: 590px; aspect-ratio: auto; }
      .concept-diagram figcaption { padding: 11px 12px 13px; }
      .mode-deep-intro h2 { font-size: 31px; }
      .mode-deep-intro > p:last-child { font-size: 16px; }
      .mode-lesson { grid-template-columns: 1fr; gap: 8px; padding: 42px 0 48px; }
      .mode-step-number { margin: 0; }
      .mode-lesson h2, .mode-overview-diagram h2 { font-size: 25px; }
      .term-ledger > div { grid-template-columns: 1fr; gap: 4px; }
      .beginner-scene, .toy-example { padding: 17px 16px; }
      .toy-row { grid-template-columns: 1fr; gap: 3px; }
      .lecture-visual-pair { grid-template-columns: 1fr; }
      .lecture-source-note { grid-column: auto; }
      .operation-grid { grid-template-columns: 1fr; }
      .deep-diagram iframe, .mode-overview-diagram iframe { height: 590px; aspect-ratio: auto; }
      .deep-diagram.generic-concept-diagram iframe { height: 480px; }
      .mode-overview-diagram h2 { padding: 0 18px; }
      .deep-term-grid, .concept-index-grid { grid-template-columns: 1fr; }
      .source-slide img { width: 760px; max-width: none; }
      .concept-sequence-nav { grid-template-columns: 1fr 1fr; }
      .concept-sequence-nav a:nth-child(2) { grid-column: 1 / -1; grid-row: 1; justify-content: center; }
      .lecture-masterclass { padding-left: 15px; }
      .lecture-masterclass > h4,
      .lecture-prose-part > h4 { font-size: 18px; }
      .recall-lecture-concept-body p { font-size: 15px; line-height: 1.85; }
      .recall-lecture-solve ol { grid-template-columns: 1fr; }
      .recall-chapter-grid { grid-template-columns: 1fr; }
      .recall-chapter-card { min-height: auto; }
      .recall-chapter-intro { grid-template-columns: 1fr; gap: 18px; }
      .recall-story-list { margin-top: 22px; }
      .recall-story-card { grid-template-columns: 34px minmax(0, 1fr); gap: 12px; padding-block: 22px; }
      .recall-story-card h2 { font-size: 18px; }
      .recall-story-state { grid-column: 2; justify-self: start; }
      .recall-item.recall-article { border-radius: 10px; padding: 28px 18px 34px; }
      .recall-article > .concept-head h2 { font-size: 28px; }
      .recall-prompt { padding: 18px; }
      .recall-prompt p { font-size: 16px; }
      .recall-self-grade { grid-template-columns: 1fr; }
      .recall-self-grade .recall-actions button { flex: 1 1 100%; }
      .recall-article-nav { grid-template-columns: 1fr; }
      .recall-article-nav a:last-child { text-align: left; }
      .recall-mobile-bar {
        position: fixed;
        z-index: 40;
        right: 0;
        bottom: 0;
        left: 0;
        display: grid;
        grid-template-columns: .8fr 1fr 1.2fr;
        gap: 8px;
        border-top: 1px solid #ccd6d0;
        background: rgba(255,254,251,.96);
        padding: 10px 14px calc(10px + env(safe-area-inset-bottom));
        backdrop-filter: blur(10px);
      }
      .recall-mobile-bar a { display: grid; min-height: 44px; place-items: center; border-radius: 8px; background: #e7efeb; color: #20483e; text-decoration: none; font-weight: 800; }
      .recall-mobile-bar a:last-child { background: var(--recall-green); color: white; }
    }