:root {
      --bg: #0b0b0c;
      --panel: #111113;
      --ink: #ece8e1;
      --ink-1: #b8b2a6;
      --ink-2: #8a8478;
      --ink-3: #837d72;
      --rule: rgba(236, 232, 225, 0.11);
      --rule-strong: rgba(236, 232, 225, 0.22);
      --accent: #e89947;
      --accent-soft: rgba(232, 153, 71, 0.12);
      --serif: 'Fraunces', Georgia, serif;
      --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
      --mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
      color-scheme: dark;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      overflow-x: hidden;
      background:
        linear-gradient(rgba(236, 232, 225, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(236, 232, 225, 0.025) 1px, transparent 1px),
        radial-gradient(circle at 14% 8%, rgba(232, 153, 71, 0.09), transparent 30%),
        var(--bg);
      background-size: 64px 64px, 64px 64px, auto, auto;
      color: var(--ink);
      font-family: var(--sans);
      line-height: 1.6;
    }
    a { color: inherit; text-decoration: none; }
    code, pre { font-family: var(--mono); }

    .site-nav {
      position: sticky;
      top: 0;
      z-index: 50;
      border-bottom: 1px solid var(--rule);
      background: rgba(11, 11, 12, 0.84);
      backdrop-filter: saturate(140%) blur(12px);
    }
    .nav-inner {
      width: min(1280px, calc(100% - 56px));
      min-height: 72px;
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 24px;
    }
    .logo {
      font-family: var(--mono);
      font-size: 13px;
      letter-spacing: 0.06em;
      color: var(--ink);
    }
    .logo::before {
      content: '';
      display: inline-block;
      width: 7px;
      height: 7px;
      margin-right: 10px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 16px rgba(232, 153, 71, 0.55);
      vertical-align: 1px;
    }
    .nav-links {
      display: flex;
      gap: 22px;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
      font-family: var(--mono);
      font-size: 12px;
      letter-spacing: 0.06em;
      color: var(--ink-2);
    }
    .nav-links a:hover { color: var(--accent); }

    .course-hero {
      width: min(1280px, calc(100% - 56px));
      margin: 0 auto;
      padding: 120px 0 82px;
      display: grid;
      grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.72fr);
      gap: 84px;
      align-items: end;
    }
    .back-link,
    .eyebrow {
      font-family: var(--mono);
      font-size: 12px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--accent);
    }
    .back-link {
      display: inline-block;
      margin-bottom: 28px;
      color: var(--ink-2);
      border-bottom: 1px solid var(--rule-strong);
      padding-bottom: 4px;
    }
    .back-link:hover {
      color: var(--accent);
      border-color: var(--accent);
    }
    .course-hero h1 {
      margin: 18px 0 26px;
      max-width: 11ch;
      overflow-wrap: break-word;
      font-family: var(--serif);
      font-size: clamp(58px, 8vw, 126px);
      font-weight: 350;
      line-height: 0.94;
      letter-spacing: 0;
      font-variation-settings: "opsz" 144, "SOFT" 55;
    }
    .course-hero h1 em {
      color: var(--accent);
      font-style: italic;
    }
    .course-hero .deck {
      max-width: 58ch;
      overflow-wrap: break-word;
      color: var(--ink-1);
      font-family: var(--serif);
      font-size: 23px;
      line-height: 1.45;
      font-weight: 350;
      font-variation-settings: "opsz" 72, "SOFT" 45;
    }
    .course-card {
      border: 1px solid var(--rule-strong);
      background:
        linear-gradient(180deg, rgba(232, 153, 71, 0.045), transparent 44%),
        rgba(255, 255, 255, 0.014);
      padding: 28px;
    }
    .course-card h2 {
      margin: 0 0 16px;
      font-family: var(--serif);
      font-size: 32px;
      font-weight: 350;
      line-height: 1.08;
      font-variation-settings: "opsz" 96, "SOFT" 55;
    }
    .course-card p {
      margin: 0 0 18px;
      color: var(--ink-2);
    }
    .course-facts {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 1px;
      border: 1px solid var(--rule);
      background: var(--rule);
    }
    .course-facts span {
      padding: 14px;
      background: rgba(11, 11, 12, 0.7);
      color: var(--ink-2);
      font-family: var(--mono);
      font-size: 11px;
      line-height: 1.35;
    }
    .course-facts strong {
      display: block;
      color: var(--accent);
      font-family: var(--serif);
      font-size: 30px;
      font-weight: 350;
      line-height: 1;
      margin-bottom: 5px;
    }
    .mission-hero-actions {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 34px;
    }
    .mission-btn,
    .mission-btn-secondary {
      display: inline-flex;
      min-height: 44px;
      align-items: center;
      justify-content: center;
      gap: 10px;
      border: 1px solid var(--accent);
      padding: 11px 16px;
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    }
    .mission-btn {
      background: var(--accent);
      color: #15110d;
    }
    .mission-btn:hover,
    .mission-btn:focus-visible {
      transform: translateY(-1px);
      background: #f4ae66;
    }
    .mission-btn-secondary {
      border-color: var(--rule-strong);
      color: var(--ink-1);
      background: rgba(255, 255, 255, 0.018);
    }
    .mission-btn-secondary:hover,
    .mission-btn-secondary:focus-visible {
      border-color: var(--accent);
      color: var(--accent);
      transform: translateY(-1px);
    }
    .mission-hero-status {
      width: 100%;
      color: var(--ink-2);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }
    .mission-control {
      display: grid;
      gap: 20px;
      margin-top: 22px;
      padding-top: 22px;
      border-top: 1px solid var(--rule);
    }
    .mission-control-head {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 16px;
      color: var(--ink-2);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
    }
    .mission-control-head strong {
      color: var(--accent);
      font-family: var(--serif);
      font-size: 30px;
      font-weight: 350;
      letter-spacing: 0;
      text-transform: none;
    }
    .mission-meter {
      height: 8px;
      overflow: hidden;
      border: 1px solid var(--rule);
      background: rgba(255, 255, 255, 0.025);
    }
    .mission-meter span {
      display: block;
      width: 0%;
      height: 100%;
      background: linear-gradient(90deg, var(--accent), #f4d38f);
      transition: width 0.35s ease;
    }
    .mission-artifact-list {
      display: grid;
      gap: 8px;
      margin: 0;
      padding: 0;
      list-style: none;
    }
    .mission-artifact-list li {
      display: flex;
      gap: 8px;
      color: var(--ink-1);
      font-size: 13px;
      line-height: 1.45;
    }
    .mission-artifact-list li::before {
      content: '□';
      color: var(--ink-3);
      font-family: var(--mono);
    }
    .mission-artifact-list li.complete::before {
      content: '✓';
      color: var(--accent);
    }
    .mission-cert-preview {
      display: grid;
      gap: 10px;
      padding: 16px;
      border: 1px solid var(--rule);
      background: rgba(232, 153, 71, 0.035);
    }
    .mission-cert-preview strong {
      color: var(--ink);
      font-family: var(--serif);
      font-size: 24px;
      font-weight: 350;
      line-height: 1.1;
    }
    .mission-cert-preview span {
      color: var(--ink-2);
      font-size: 13px;
      line-height: 1.45;
    }
    .mission-cert-preview a {
      width: fit-content;
      color: var(--accent);
      border-bottom: 1px solid var(--accent-soft);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }
    .mission-cert-preview.is-locked a {
      color: var(--ink-3);
      border-bottom-color: var(--rule);
      pointer-events: none;
    }
    .course-launchpad {
      width: min(1280px, calc(100% - 56px));
      margin: 0 auto 58px;
      border-top: 1px solid var(--rule);
      padding-top: 44px;
    }
    .course-launchpad-head {
      display: grid;
      grid-template-columns: minmax(0, 0.82fr) minmax(320px, 0.72fr);
      gap: 52px;
      align-items: end;
      margin-bottom: 28px;
    }
    .course-launchpad h2 {
      margin: 0;
      font-family: var(--serif);
      font-size: clamp(38px, 5vw, 68px);
      font-weight: 350;
      line-height: 1.02;
      letter-spacing: 0;
      font-variation-settings: "opsz" 144, "SOFT" 55;
    }
    .course-launchpad p {
      margin: 0;
      color: var(--ink-2);
      font-size: 16px;
      line-height: 1.62;
    }
    .course-method {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 1px;
      margin-bottom: 24px;
      border: 1px solid var(--rule);
      background: var(--rule);
    }
    .course-method-step {
      min-height: 138px;
      padding: 18px;
      background: rgba(11, 11, 12, 0.78);
    }
    .course-method-step span {
      display: block;
      margin-bottom: 12px;
      color: var(--accent);
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }
    .course-method-step strong {
      display: block;
      margin-bottom: 8px;
      color: var(--ink);
      font-family: var(--serif);
      font-size: 23px;
      font-weight: 350;
      line-height: 1.1;
      font-variation-settings: "opsz" 72, "SOFT" 55;
    }
    .course-method-step p {
      color: var(--ink-2);
      font-size: 13px;
      line-height: 1.5;
    }
    .course-proof-strip {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 1px;
      margin-bottom: 24px;
      border: 1px solid var(--rule);
      background: var(--rule);
    }
    .course-proof {
      min-height: 104px;
      padding: 18px;
      background: rgba(11, 11, 12, 0.78);
    }
    .course-proof strong {
      display: block;
      margin-bottom: 8px;
      color: var(--accent);
      font-family: var(--serif);
      font-size: 32px;
      font-weight: 350;
      line-height: 1;
      font-variation-settings: "opsz" 96, "SOFT" 55;
    }
    .course-proof span {
      color: var(--ink-2);
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.12em;
      line-height: 1.5;
      text-transform: uppercase;
    }
    .course-path {
      margin-bottom: 24px;
      border: 1px solid var(--rule-strong);
      background: rgba(255, 255, 255, 0.012);
      padding: 18px;
    }
    .course-path-head {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 18px;
      margin-bottom: 18px;
    }
    .course-path-head span {
      color: var(--accent);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }
    .course-path-head small {
      color: var(--ink-2);
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }
    .course-path-track {
      display: grid;
      grid-template-columns: repeat(8, minmax(0, 1fr));
      gap: 1px;
      background: var(--rule);
      border: 1px solid var(--rule);
    }
    .course-path-item {
      min-height: 126px;
      display: grid;
      align-content: start;
      gap: 8px;
      padding: 14px;
      background: rgba(11, 11, 12, 0.82);
      color: inherit;
      border-bottom: 0;
      position: relative;
    }
    .course-path-item::before {
      content: '';
      width: 11px;
      height: 11px;
      border: 1px solid var(--ink-3);
      background: var(--bg);
      border-radius: 50%;
    }
    .course-path-item.is-active::before,
    .course-path-item.is-complete::before {
      border-color: var(--accent);
      background: var(--accent);
      box-shadow: 0 0 18px rgba(232, 153, 71, 0.45);
    }
    .course-path-item span {
      color: var(--accent);
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
    }
    .course-path-item strong {
      color: var(--ink);
      font-size: 13px;
      line-height: 1.3;
      font-weight: 600;
    }
    .course-path-item small {
      color: var(--ink-2);
      font-size: 11px;
      line-height: 1.35;
    }
    .course-launch-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 1px;
      border: 1px solid var(--rule);
      background: var(--rule);
    }
    .course-launch-card {
      min-height: 210px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      padding: 20px;
      background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.018), transparent 54%),
        var(--bg);
      border-bottom: 0;
      transition: background 0.2s ease, color 0.2s ease;
    }
    .course-launch-card:hover,
    .course-launch-card:focus-visible {
      background:
        linear-gradient(180deg, rgba(232, 153, 71, 0.055), transparent 60%),
        var(--bg);
      outline: none;
    }
    .course-launch-card .card-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      color: var(--accent);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
    }
    .course-launch-card .card-top::after {
      content: 'Start';
      color: var(--ink-3);
      font-size: 10px;
    }
    .course-launch-card.is-complete .card-top::after {
      content: 'Done';
      color: var(--accent);
    }
    .course-launch-card h3 {
      margin: 0;
      color: var(--ink);
      font-family: var(--serif);
      font-size: 27px;
      font-weight: 350;
      line-height: 1.08;
      letter-spacing: 0;
      font-variation-settings: "opsz" 96, "SOFT" 55;
      transition: color 0.2s ease;
    }
    .course-launch-card:hover h3 {
      color: var(--accent);
    }
    .course-launch-card.is-active {
      background:
        linear-gradient(180deg, rgba(232, 153, 71, 0.075), transparent 62%),
        var(--bg);
      box-shadow: inset 0 0 0 1px rgba(232, 153, 71, 0.34);
    }
    .course-launch-card p {
      color: var(--ink-2);
      font-size: 14px;
      line-height: 1.52;
    }
    .course-launch-card small {
      margin-top: auto;
      padding-top: 12px;
      border-top: 1px solid var(--rule);
      color: var(--ink-2);
      font-family: var(--mono);
      font-size: 10px;
      line-height: 1.45;
      letter-spacing: 0.05em;
      text-transform: uppercase;
    }

    .course-shell {
      width: min(1280px, calc(100% - 56px));
      margin: 0 auto 120px;
      display: grid;
      grid-template-columns: 290px minmax(0, 1fr);
      gap: 64px;
      align-items: start;
      border-top: 1px solid var(--rule);
      padding-top: 56px;
    }
    .course-toc {
      position: sticky;
      top: 104px;
      max-height: calc(100vh - 128px);
      overflow: auto;
      border: 1px solid var(--rule);
      background: rgba(255, 255, 255, 0.012);
      padding: 20px;
    }
    .course-toc .toc-title {
      display: block;
      margin-bottom: 14px;
      color: var(--accent);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }
    .toc-progress {
      display: grid;
      gap: 8px;
      padding: 12px 0 14px;
      margin-bottom: 14px;
      border-bottom: 1px solid var(--rule);
    }
    .toc-progress-label {
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--ink-3);
    }
    .toc-progress-value {
      font-family: 'Fraunces', Georgia, serif;
      font-weight: 350;
      font-size: 22px;
      color: var(--ink);
      font-variation-settings: "opsz" 72, "SOFT" 60;
    }
    .toc-progress-value strong {
      font-weight: 350;
      color: var(--accent);
    }
    .toc-progress-sep { color: var(--ink-3); margin: 0 2px; }
    .toc-progress-row {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 8px;
    }
    .toc-progress-detail {
      color: var(--ink-3);
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }
    .toc-meter {
      height: 5px;
      overflow: hidden;
      background: rgba(255, 255, 255, 0.035);
    }
    .toc-meter span {
      display: block;
      width: 0%;
      height: 100%;
      background: var(--accent);
      transition: width 0.3s ease;
    }
    .toc-lessons {
      list-style: none;
      margin: 0;
      padding: 0;
      display: grid;
      gap: 4px;
    }
    .toc-lessons > li { padding: 0; }
    .toc-lesson-link {
      display: grid;
      grid-template-columns: 28px 1fr 18px;
      gap: 8px;
      padding: 6px 8px 6px 10px;
      border-left: 1px solid transparent;
      color: var(--ink-2);
      align-items: baseline;
      transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
    }
    .toc-lesson-link .toc-num {
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.1em;
      color: var(--ink-3);
    }
    .toc-lesson-link .toc-name {
      font-family: var(--mono);
      font-size: 11px;
      line-height: 1.4;
      color: var(--ink-2);
    }
    .toc-lesson-link:hover { color: var(--accent); }
    .toc-lesson-link:hover .toc-name { color: var(--accent); }
    .toc-lesson-link::after {
      content: '○';
      color: var(--ink-3);
      font-family: var(--mono);
      font-size: 10px;
      justify-self: end;
    }
    .toc-lessons > li.completed > .toc-lesson-link::after {
      content: '✓';
      color: var(--accent);
    }
    .toc-lessons > li.active > .toc-lesson-link {
      border-left-color: var(--accent);
      background: rgba(232, 153, 71, 0.05);
    }
    .toc-lessons > li.active > .toc-lesson-link .toc-num,
    .toc-lessons > li.active > .toc-lesson-link .toc-name {
      color: var(--accent);
    }
    .toc-sublist {
      list-style: none;
      margin: 4px 0 8px 38px;
      padding: 0;
      display: none;
      gap: 2px;
    }
    .toc-lessons > li.active > .toc-sublist { display: grid; }
    .toc-sublist a {
      display: flex;
      align-items: center;
      min-height: 28px;
      padding: 5px 6px;
      font-family: var(--mono);
      font-size: 10.5px;
      line-height: 1.45;
      color: var(--ink-2);
    }
    .toc-sublist a:hover { color: var(--accent); }
    .toc-sublist a.active {
      color: var(--accent);
    }

    .course-content {
      min-width: 0;
      max-width: 920px;
    }
    .lesson-player-head {
      margin-bottom: 28px;
      padding: 24px;
      border: 1px solid var(--rule-strong);
      background:
        linear-gradient(180deg, rgba(232, 153, 71, 0.04), transparent 56%),
        rgba(255, 255, 255, 0.014);
    }
    .lesson-player-head-top {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 18px;
      margin-bottom: 14px;
      color: var(--accent);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
    }
    .lesson-player-head h2 {
      margin: 0 0 10px;
      padding: 0;
      border: 0;
      font-family: var(--serif);
      font-size: clamp(34px, 5vw, 58px);
      font-weight: 350;
      line-height: 1.03;
      letter-spacing: 0;
      font-variation-settings: "opsz" 144, "SOFT" 55;
    }
    .lesson-player-head p {
      max-width: 68ch;
      margin: 0;
      color: var(--ink-2);
      font-size: 15px;
      line-height: 1.62;
    }
    .lesson-player-actions {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 18px;
    }
    .lesson-player-actions a,
    .lesson-player-actions button {
      min-height: 40px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--rule-strong);
      padding: 9px 12px;
      color: var(--ink-1);
      background: rgba(255, 255, 255, 0.012);
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      cursor: pointer;
    }
    .lesson-player-actions a:hover,
    .lesson-player-actions button:hover {
      border-color: var(--accent);
      color: var(--accent);
    }
    .lesson-player-actions button[hidden] {
      display: none;
    }
    .lesson-player-complete {
      border-color: var(--accent) !important;
      color: #15110d !important;
      background: var(--accent) !important;
    }
    .lesson-player-complete:hover,
    .lesson-player-complete:focus-visible {
      color: #15110d !important;
      background: #f4ae66 !important;
    }
    .lesson-player-complete.is-complete {
      border-color: var(--rule-strong) !important;
      color: var(--accent) !important;
      background: rgba(232, 153, 71, 0.07) !important;
    }
    .lesson-workbench {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(260px, 0.48fr);
      gap: 1px;
      margin-top: 20px;
      border: 1px solid var(--rule);
      background: var(--rule);
    }
    .lesson-workbench-card {
      min-height: 132px;
      padding: 18px;
      background: rgba(11, 11, 12, 0.78);
    }
    .lesson-workbench-card.full {
      grid-column: 1 / -1;
    }
    .lesson-workbench-card span {
      display: block;
      margin-bottom: 10px;
      color: var(--accent);
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }
    .lesson-workbench-card strong {
      display: block;
      color: var(--ink);
      font-size: 16px;
      line-height: 1.4;
      font-weight: 600;
    }
    .lesson-workbench-card p,
    .lesson-workbench-card li {
      color: var(--ink-2);
      font-size: 13px;
      line-height: 1.52;
    }
    .lesson-workbench-card ul {
      margin: 0;
      padding-left: 18px;
    }
    .lesson-workbench-card li + li {
      margin-top: 6px;
    }
    .lesson-section-jumps {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 12px;
    }
    .lesson-section-jumps a {
      min-height: 34px;
      display: inline-flex;
      align-items: center;
      border: 1px solid var(--rule-strong);
      padding: 7px 9px;
      color: var(--ink-1);
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }
    .lesson-section-jumps a:hover {
      border-color: var(--accent);
      color: var(--accent);
    }
    .lesson-module {
      animation: lessonFade 0.24s ease both;
    }
    .lesson-module[hidden] {
      display: none !important;
    }
    @keyframes lessonFade {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .course-player-ready .course-content h3[id^="lesson-"],
    .course-player-ready .course-content h2[id^="lesson-"] {
      margin-top: 0;
    }
    .course-content > *:first-child { margin-top: 0; }
    .course-content h1,
    .course-content h2,
    .course-content h3,
    .course-content h4 {
      color: var(--ink);
      letter-spacing: 0;
      scroll-margin-top: 96px;
    }
    .course-content h1,
    .course-content h2 {
      margin: 72px 0 24px;
      padding-top: 28px;
      border-top: 1px solid var(--rule);
      font-family: var(--serif);
      font-weight: 350;
      line-height: 1.05;
      font-variation-settings: "opsz" 144, "SOFT" 55;
    }
    .course-content h1 { font-size: 58px; }
    .course-content h2 { font-size: 48px; }
    .course-content h3 {
      margin: 42px 0 14px;
      font-family: var(--serif);
      font-size: 31px;
      font-weight: 350;
      line-height: 1.12;
      font-variation-settings: "opsz" 96, "SOFT" 50;
    }
    .course-content h3[id^="lesson-"] {
      margin: 72px 0 24px;
      padding-top: 28px;
      border-top: 1px solid var(--rule);
      font-size: 48px;
      line-height: 1.05;
      font-variation-settings: "opsz" 144, "SOFT" 55;
    }
    .course-content h4 {
      margin: 28px 0 10px;
      color: var(--accent);
      font-family: var(--mono);
      font-size: 13px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }
    .course-content h5 {
      margin: 32px 0 10px;
      padding-left: 14px;
      border-left: 1px solid var(--accent);
      color: var(--ink);
      font-family: var(--serif);
      font-weight: 350;
      font-size: 21px;
      line-height: 1.3;
      letter-spacing: 0;
      font-variation-settings: "opsz" 72, "SOFT" 50;
      scroll-margin-top: 96px;
    }
    .course-content p,
    .course-content li {
      color: var(--ink-1);
      font-size: 17px;
      line-height: 1.72;
    }
    .course-content p { margin: 0 0 18px; }
    .course-content strong { color: var(--ink); font-weight: 600; }
    .course-content em { color: var(--ink); }
    .course-content a {
      color: var(--accent);
      border-bottom: 1px solid var(--accent-soft);
    }
    .course-content ul,
    .course-content ol {
      margin: 0 0 24px 24px;
      padding: 0;
    }
    .course-content li + li { margin-top: 8px; }
    .course-content table {
      width: 100%;
      border-collapse: collapse;
      margin: 28px 0;
      border: 1px solid var(--rule);
      font-size: 14px;
    }
    .course-content th,
    .course-content td {
      border: 1px solid var(--rule);
      padding: 12px 14px;
      vertical-align: top;
      color: var(--ink-1);
    }
    .course-content th {
      color: var(--accent);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      background: rgba(232, 153, 71, 0.05);
    }
    .course-content pre {
      max-width: 100%;
      overflow: auto;
      margin: 24px 0;
      padding: 20px;
      border: 1px solid var(--rule);
      background: rgba(0, 0, 0, 0.28);
      color: var(--ink-1);
      font-size: 13px;
      line-height: 1.55;
    }
    .course-content :not(pre) > code {
      padding: 2px 5px;
      border: 1px solid var(--rule);
      background: rgba(255, 255, 255, 0.025);
      color: var(--ink);
      font-size: 0.88em;
    }
    .course-content blockquote {
      margin: 28px 0;
      padding: 18px 22px;
      border-left: 1px solid var(--accent);
      background: rgba(232, 153, 71, 0.035);
    }
    .course-content hr {
      border: 0;
      height: 1px;
      background: var(--rule);
      margin: 56px 0;
    }
    .mission-brief,
    .field-check,
    .artifact-log,
    .mission-complete-panel,
    .artifact-vault {
      margin: 28px 0;
      border: 1px solid var(--rule-strong);
      background:
        linear-gradient(180deg, rgba(232, 153, 71, 0.035), transparent 42%),
        rgba(255, 255, 255, 0.014);
    }
    .mission-brief {
      padding: 24px;
    }
    .mission-eyebrow,
    .field-check-eyebrow,
    .artifact-log-eyebrow,
    .mission-complete-eyebrow,
    .artifact-vault-eyebrow {
      display: block;
      margin-bottom: 10px;
      color: var(--accent);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }
    .mission-brief h3,
    .field-check h3,
    .artifact-log h3,
    .mission-complete-panel h3,
    .artifact-vault h3 {
      margin: 0 0 12px;
      padding: 0;
      border: 0;
      font-family: var(--serif);
      font-size: 30px;
      font-weight: 350;
      line-height: 1.1;
      font-variation-settings: "opsz" 96, "SOFT" 55;
    }
    .mission-brief-grid {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(220px, 0.55fr);
      gap: 22px;
      margin-top: 18px;
    }
    .mission-brief-card {
      padding: 18px;
      border: 1px solid var(--rule);
      background: rgba(0, 0, 0, 0.16);
    }
    .mission-brief-card strong {
      display: block;
      margin-bottom: 8px;
      color: var(--accent);
      font-family: var(--mono);
      font-size: 11px;
      font-weight: 500;
      letter-spacing: 0.12em;
      text-transform: uppercase;
    }
    .mission-brief-card ul {
      margin: 0 0 0 18px;
    }
    .mission-brief-card li,
    .mission-brief-card p {
      color: var(--ink-1);
      font-size: 15px;
      line-height: 1.55;
    }
    .field-check,
    .artifact-log,
    .mission-complete-panel,
    .artifact-vault {
      padding: 24px;
    }
    .field-check-list {
      display: grid;
      gap: 14px;
      margin-top: 18px;
    }
    .quiz-card {
      padding: 18px;
      border: 1px solid var(--rule);
      background: rgba(11, 11, 12, 0.62);
    }
    .quiz-card p {
      margin: 0 0 12px;
      color: var(--ink);
      font-size: 16px;
      line-height: 1.5;
    }
    .quiz-options {
      display: grid;
      gap: 8px;
    }
    .quiz-option {
      width: 100%;
      min-height: 42px;
      border: 1px solid var(--rule);
      background: rgba(255, 255, 255, 0.018);
      color: var(--ink-1);
      padding: 10px 12px;
      text-align: left;
      font: 500 13px/1.45 var(--sans);
      cursor: pointer;
      transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
    }
    .quiz-option:hover,
    .quiz-option:focus-visible {
      border-color: var(--accent);
      color: var(--ink);
      outline: none;
    }
    .quiz-option.is-correct {
      border-color: rgba(119, 205, 151, 0.8);
      background: rgba(119, 205, 151, 0.08);
      color: var(--ink);
    }
    .quiz-option.is-wrong {
      border-color: rgba(232, 96, 71, 0.72);
      background: rgba(232, 96, 71, 0.08);
      color: var(--ink);
    }
    .quiz-feedback {
      display: none;
      margin: 12px 0 0;
      color: var(--ink-2);
      font-size: 14px;
      line-height: 1.5;
    }
    .quiz-card.has-answer .quiz-feedback {
      display: block;
    }
    .artifact-checks {
      display: grid;
      gap: 10px;
      margin-top: 18px;
    }
    .artifact-check {
      display: grid;
      grid-template-columns: 22px 1fr;
      gap: 10px;
      align-items: start;
      padding: 12px;
      border: 1px solid var(--rule);
      background: rgba(255, 255, 255, 0.014);
      color: var(--ink-1);
      font-size: 15px;
      line-height: 1.5;
    }
    .artifact-check input {
      width: 16px;
      height: 16px;
      margin-top: 4px;
      accent-color: var(--accent);
    }
    .mission-complete-panel {
      display: grid;
      gap: 16px;
    }
    .mission-complete-actions {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .mission-complete-button {
      min-height: 44px;
      border: 1px solid var(--accent);
      background: var(--accent);
      color: #15110d;
      padding: 11px 16px;
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      cursor: pointer;
      transition: transform 0.2s ease, background 0.2s ease;
    }
    .mission-complete-button:hover,
    .mission-complete-button:focus-visible {
      transform: translateY(-1px);
      background: #f4ae66;
      outline: none;
    }
    .mission-complete-button.is-complete {
      background: transparent;
      color: var(--accent);
    }
    .mission-next-link {
      color: var(--ink-1);
      border-bottom: 1px solid var(--rule-strong);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }
    .mission-next-link:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
    .mission-complete-note {
      margin: 0;
      color: var(--ink-2);
      font-size: 14px;
    }
    .artifact-vault {
      margin-top: 72px;
    }
    .artifact-vault-head {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 18px;
      align-items: end;
      margin-bottom: 22px;
    }
    .artifact-vault-head p {
      margin: 0;
      color: var(--ink-2);
    }
    .artifact-vault-count {
      color: var(--accent);
      font-family: var(--serif);
      font-size: 42px;
      font-weight: 350;
      line-height: 1;
    }
    .artifact-vault-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 1px;
      border: 1px solid var(--rule);
      background: var(--rule);
    }
    .artifact-vault-item {
      display: grid;
      gap: 8px;
      padding: 18px;
      background: rgba(11, 11, 12, 0.76);
      color: inherit;
      border-bottom: 0;
    }
    .artifact-vault-item span {
      color: var(--ink-3);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
    }
    .artifact-vault-item strong {
      color: var(--ink);
      font-size: 17px;
      line-height: 1.35;
    }
    .artifact-vault-item small {
      color: var(--ink-2);
      font-size: 13px;
      line-height: 1.45;
    }
    .artifact-vault-item.is-complete span {
      color: var(--accent);
    }
    .artifact-vault-certificate {
      margin-top: 22px;
      padding: 18px;
      border: 1px solid var(--rule-strong);
      background: rgba(232, 153, 71, 0.045);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      flex-wrap: wrap;
    }
    .artifact-vault-certificate p {
      margin: 0;
      color: var(--ink-1);
      font-size: 15px;
    }
    .course-next {
      margin: 80px 0 24px;
      padding: 36px 0 0;
      border-top: 1px solid var(--rule-strong);
    }
    .course-next-eyebrow {
      display: block;
      margin-bottom: 14px;
      color: var(--accent);
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }
    .course-next-title {
      font-family: var(--serif);
      font-weight: 350;
      font-size: 42px;
      line-height: 1.06;
      letter-spacing: 0;
      margin: 0 0 32px;
      color: var(--ink);
      font-variation-settings: "opsz" 144, "SOFT" 55;
    }
    .course-next-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 1px;
      background: var(--rule);
      border: 1px solid var(--rule);
    }
    .course-next-card {
      display: flex;
      flex-direction: column;
      gap: 10px;
      padding: 24px;
      background: rgba(11, 11, 12, 0.72);
      color: inherit;
      border-bottom: 0;
      transition: background 0.2s ease;
    }
    .course-next-card:hover { background: rgba(232, 153, 71, 0.05); }
    .course-next-card:hover h4 { color: var(--accent); }
    .course-next-card:hover .course-next-cta { color: var(--accent); }
    .course-next-card .course-next-num {
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.16em;
      color: var(--ink-3);
    }
    .course-next-card h4 {
      margin: 0;
      font-family: var(--serif);
      font-weight: 350;
      font-size: 23px;
      line-height: 1.12;
      letter-spacing: 0;
      color: var(--ink);
      font-variation-settings: "opsz" 96, "SOFT" 55;
      transition: color 0.2s ease;
      text-transform: none;
    }
    .course-next-card p {
      margin: 0;
      color: var(--ink-2);
      font-size: 14.5px;
      line-height: 1.55;
    }
    .course-next-card .course-next-cta {
      margin-top: auto;
      padding-top: 8px;
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.08em;
      color: var(--ink-2);
      transition: color 0.2s ease;
    }
    .footer {
      border-top: 1px solid var(--rule);
      padding: 42px 0;
      color: var(--ink-3);
      font-family: var(--mono);
      font-size: 12px;
      letter-spacing: 0.04em;
    }
    .footer .inner {
      width: min(1280px, calc(100% - 56px));
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      gap: 24px;
      flex-wrap: wrap;
    }

    a:focus-visible,
    button:focus-visible,
    input:focus-visible,
    [tabindex]:focus-visible,
    .course-launch-card:focus-visible,
    .quiz-option:focus-visible,
    .mission-complete-button:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 3px;
    }

    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *,
      *::before,
      *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
      }
    }

    @media (max-width: 920px) {
      .nav-inner,
      .course-hero,
      .course-shell,
      .footer .inner {
        width: calc(100% - 32px);
      }
      .nav-links { display: none; }
      .course-hero {
        grid-template-columns: 1fr;
        gap: 32px;
        padding: 88px 0 56px;
      }
      .course-hero h1 { max-width: 9ch; }
      .course-launchpad {
        width: calc(100% - 32px);
      }
      .course-launchpad-head,
      .course-method,
      .course-proof-strip,
      .course-path-track,
      .course-launch-grid {
        grid-template-columns: 1fr;
      }
      .course-shell {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .course-toc {
        position: static;
        max-height: none;
      }
    }
    @media (max-width: 600px) {
      .course-hero h1 {
        max-width: 100%;
        font-size: 44px;
        line-height: 1.02;
      }
      .course-hero .eyebrow {
        max-width: 100%;
        white-space: normal;
        overflow-wrap: anywhere;
      }
      .course-hero .deck { font-size: 20px; }
      .course-card { padding: 22px; }
      .course-facts { grid-template-columns: 1fr; }
      .mission-brief-grid,
      .artifact-vault-head,
      .artifact-vault-grid {
        grid-template-columns: 1fr;
      }
      .mission-hero-actions,
      .mission-complete-actions,
      .artifact-vault-certificate {
        align-items: stretch;
      }
      .mission-btn,
      .mission-btn-secondary,
      .mission-complete-button,
      .mission-next-link,
      .artifact-vault-certificate a,
      .lesson-player-actions a,
      .lesson-player-actions button {
        width: 100%;
      }
      .lesson-player-head {
        padding: 20px;
      }
      .lesson-workbench {
        grid-template-columns: 1fr;
      }
      .lesson-workbench-card.full {
        grid-column: auto;
      }
      .lesson-player-head-top,
      .lesson-player-actions {
        align-items: stretch;
        flex-direction: column;
      }
      .course-content h1 { font-size: 42px; }
      .course-content h2 { font-size: 36px; }
      .course-content h3 { font-size: 27px; }
      .course-content h5 { font-size: 18px; }
      .course-next-grid { grid-template-columns: 1fr; }
      .course-next-title { font-size: 30px; }
      .course-content p,
      .course-content li { font-size: 16px; }
      .course-content pre { font-size: 12px; padding: 16px; }
    }