/* tutorials.css — Pass-2 page styles (generated by tools/pass2-css.mjs) */

/* ===== inline design block #0 (from tutorials.student.html) ===== */
:root {
    --bg: #fbfaf7; --bg-elev: #ffffff; --bg-sunk: #f3f1ec;
    --ink: #1a1a1a; --ink-2: #4a4a4a; --ink-3: #8a8780; --ink-4: #c4c1b8;
    --line: rgba(20,18,12,0.08); --line-2: rgba(20,18,12,0.04);
    --accent: #4f5eed; --accent-soft: rgba(79,94,237,0.10); --accent-ink: #2b3aa8;
    --ok: #1f8a5a; --ok-soft: rgba(31,138,90,0.10);
    --warn: #c97a2b;
    --t-cat-1: #4f5eed; --t-cat-2: #1f8a5a; --t-cat-3: #d6a017; --t-cat-4: #8a5af0; --t-cat-5: #c97a2b;
    --shadow-card: 0 1px 0 rgba(255,255,255,0.7) inset, 0 1px 2px rgba(20,18,12,0.04), 0 8px 20px rgba(20,18,12,0.05);
    --shadow-card-lg: 0 1px 0 rgba(255,255,255,0.7) inset, 0 1px 3px rgba(20,18,12,0.04), 0 20px 50px rgba(20,18,12,0.06);
    --font-display: 'Heebo', system-ui, sans-serif;
    --font-body: 'Heebo', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  }
  * { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; }
  body {
    background: var(--bg);
    background-image: radial-gradient(800px 500px at 100% -10%, rgba(79,94,237,0.06), transparent 60%);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
  }
  a { color: var(--accent); text-decoration: none; }

  /* Top bar */
  .tu-top {
    background: color-mix(in oklab, var(--bg-elev) 90%, transparent);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 0.5px solid var(--line);
    position: sticky; top: 0; z-index: 30;
  }
  .tu-top-inner {
    max-width: 1280px; margin: 0 auto;
    padding: 14px 32px;
    display: flex; align-items: center; gap: 16px;
  }
  .tu-logo { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
  .tu-logo-mark {
    width: 32px; height: 32px; border-radius: 9px;
    background: linear-gradient(135deg, var(--accent), color-mix(in oklab, var(--accent) 60%, var(--ok)));
    color: #fff; display: inline-flex; align-items: center; justify-content: center;
    font-family: var(--font-mono); font-weight: 700; font-size: 15px;
  }
  .tu-logo-name { font-family: var(--font-display); font-size: 16px; font-weight: 700; }
  .tu-logo-name span { color: var(--accent); font-weight: 800; }
  .tu-spacer { flex: 1; }
  .tu-back {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 7px 14px; border-radius: 999px;
    color: var(--ink-2); font-size: 13px; text-decoration: none;
  }
  .tu-back:hover { background: var(--bg-sunk); color: var(--ink); text-decoration: none; }
  .tu-back svg { width: 13px; height: 13px; }

  /* Hero */
  .tu-hero {
    max-width: 1280px; margin: 0 auto;
    padding: 56px 32px 24px;
  }
  .tu-hero-eyebrow {
    display: inline-flex; align-items: center; gap: 7px;
    font-size: 11.5px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--accent);
    padding: 5px 14px; border-radius: 999px;
    background: var(--accent-soft);
    border: 0.5px solid color-mix(in oklab, var(--accent) 18%, transparent);
    margin-bottom: 16px;
  }
  .tu-hero-eyebrow svg { width: 13px; height: 13px; }
  .tu-hero h1 {
    font-family: var(--font-display);
    font-size: 42px; font-weight: 700;
    letter-spacing: -0.022em; line-height: 1.08;
    margin: 0 0 14px;
    text-wrap: balance;
  }
  .tu-hero p {
    font-size: 17px; color: var(--ink-2);
    margin: 0 0 28px;
    max-width: 56ch; line-height: 1.55;
    text-wrap: pretty;
  }

  /* Search + filter */
  .tu-controls {
    display: flex; gap: 12px; align-items: center;
    flex-wrap: wrap;
    margin-bottom: 28px;
  }
  .tu-search {
    flex: 1; min-width: 240px;
    position: relative;
  }
  .tu-search input {
    width: 100%;
    padding: 12px 44px 12px 16px;
    border: 0.5px solid var(--line);
    border-radius: 14px;
    background: var(--bg-elev);
    color: var(--ink);
    font: inherit; font-size: 14px;
    outline: none;
    transition: border-color .15s ease, box-shadow .15s ease;
  }
  .tu-search input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
  .tu-search svg {
    position: absolute;
    inset-inline-start: 16px; top: 50%; transform: translateY(-50%);
    width: 16px; height: 16px;
    color: var(--ink-3);
    pointer-events: none;
  }
  .tu-chips {
    display: flex; flex-wrap: wrap; gap: 6px;
  }
  .tu-chip {
    appearance: none; border: 0.5px solid var(--line);
    background: var(--bg-elev);
    padding: 8px 14px;
    border-radius: 999px;
    font: inherit; font-size: 13px; font-weight: 500;
    color: var(--ink-2);
    cursor: pointer;
    transition: background .15s ease, color .15s ease, border-color .15s ease;
    display: inline-flex; align-items: center; gap: 6px;
  }
  .tu-chip:hover { background: var(--bg-sunk); color: var(--ink); }
  .tu-chip.active {
    background: var(--ink); color: var(--bg-elev);
    border-color: var(--ink);
  }
  .tu-chip .pip {
    font-family: var(--font-mono);
    font-size: 11px;
    padding: 1px 6px; border-radius: 999px;
    background: rgba(0,0,0,0.06);
    color: inherit;
  }
  .tu-chip.active .pip { background: rgba(255,255,255,0.18); }

  /* Featured */
  .tu-feat {
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
    color: #fff;
    border-radius: 22px;
    padding: 36px;
    margin: 0 32px 28px;
    max-width: 1216px;
    margin: 0 auto 28px;
    margin-left: 32px; margin-right: 32px;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 36px; align-items: center;
    position: relative; overflow: hidden;
  }
  @media (max-width: 720px) { .tu-feat { grid-template-columns: 1fr; } }
  .tu-feat::before {
    content: ""; position: absolute;
    inset-inline-end: -100px; top: -100px;
    width: 320px; height: 320px;
    background: radial-gradient(circle, color-mix(in oklab, var(--accent) 60%, transparent), transparent 70%);
    pointer-events: none;
  }
  .tu-feat-text { position: relative; z-index: 1; }
  .tu-feat-eyebrow {
    display: inline-flex; align-items: center; gap: 7px;
    font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
    background: rgba(255,255,255,0.1);
    border: 0.5px solid rgba(255,255,255,0.16);
    color: #fff; padding: 5px 12px; border-radius: 999px;
    margin-bottom: 18px;
  }
  .tu-feat-eyebrow svg { width: 12px; height: 12px; }
  .tu-feat h2 {
    font-family: var(--font-display);
    font-size: 32px; font-weight: 700;
    line-height: 1.1; margin: 0 0 14px;
    letter-spacing: -0.018em;
    color: #fff;
    text-wrap: balance;
  }
  .tu-feat p {
    font-size: 15px;
    color: rgba(255,255,255,0.72);
    margin: 0 0 20px;
    max-width: 50ch; line-height: 1.55;
  }
  .tu-feat-meta {
    display: flex; flex-wrap: wrap; gap: 8px 18px;
    margin-bottom: 22px;
    font-size: 12.5px;
    color: rgba(255,255,255,0.6);
  }
  .tu-feat-meta b { color: #fff; }
  .tu-feat-meta .item { display: inline-flex; align-items: center; gap: 5px; }
  .tu-feat-meta svg { width: 13px; height: 13px; }
  .tu-feat-play {
    appearance: none; border: 0; cursor: pointer;
    background: #fff; color: var(--ink);
    padding: 13px 26px; border-radius: 999px;
    font: inherit; font-size: 14px; font-weight: 700;
    display: inline-flex; align-items: center; gap: 8px;
    transition: transform .15s ease;
  }
  .tu-feat-play:hover { transform: translateY(-1px); }
  .tu-feat-play svg { width: 14px; height: 14px; }
  .tu-feat-thumb {
    position: relative;
    aspect-ratio: 16/10;
    border-radius: 18px;
    overflow: hidden;
    background: linear-gradient(135deg, color-mix(in oklab, var(--accent) 50%, #1a1a1a), color-mix(in oklab, var(--ok) 40%, #1a1a1a));
    border: 0.5px solid rgba(255,255,255,0.1);
    z-index: 1;
    cursor: pointer;
  }
  .tu-feat-thumb::after {
    content: "";
    position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
    background-size: 28px 28px;
    pointer-events: none;
  }
  .tu-feat-thumb-play {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    z-index: 2;
  }
  .tu-feat-thumb-play .circle {
    width: 72px; height: 72px;
    border-radius: 50%;
    background: rgba(255,255,255,0.95);
    color: var(--ink);
    display: inline-flex; align-items: center; justify-content: center;
    box-shadow: 0 16px 40px rgba(0,0,0,0.3);
    transition: transform .2s ease;
  }
  .tu-feat-thumb:hover .circle { transform: scale(1.08); }
  .tu-feat-thumb-play svg { width: 28px; height: 28px; }
  .tu-feat-dur {
    position: absolute;
    bottom: 12px; inset-inline-start: 12px;
    background: rgba(0,0,0,0.7);
    color: #fff;
    padding: 3px 8px;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
    z-index: 3;
  }

  /* Tutorial grid */
  .tu-section {
    max-width: 1280px; margin: 28px auto 0;
    padding: 0 32px;
  }
  .tu-section-head {
    display: flex; align-items: baseline;
    gap: 12px;
    margin-bottom: 18px;
  }
  .tu-section-head h2 {
    font-family: var(--font-display);
    font-size: 22px; font-weight: 700;
    margin: 0;
    letter-spacing: -0.012em;
  }
  .tu-section-head .count {
    font-size: 13px;
    color: var(--ink-3);
    font-family: var(--font-mono);
  }
  .tu-section-head .spacer { flex: 1; }
  .tu-section-head a {
    font-size: 13px;
    color: var(--accent-ink);
    font-weight: 600;
    display: inline-flex; align-items: center; gap: 4px;
  }
  .tu-section-head a svg { width: 12px; height: 12px; }

  .tu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
  }

  /* Card */
  .tu-card {
    background: var(--bg-elev);
    border: 0.5px solid var(--line);
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
    box-shadow: var(--shadow-card);
    appearance: none;
    text-align: start;
    font: inherit; color: inherit;
    width: 100%;
    padding: 0;
  }
  .tu-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-lg);
    border-color: color-mix(in oklab, var(--accent) 22%, var(--line));
  }
  .tu-card-thumb {
    position: relative;
    aspect-ratio: 16/10;
    background: linear-gradient(135deg, var(--bg-sunk), color-mix(in oklab, var(--accent) 8%, var(--bg-sunk)));
    overflow: hidden;
  }
  .tu-card-thumb::before {
    content: ""; position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(20,18,12,0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(20,18,12,0.04) 1px, transparent 1px);
    background-size: 22px 22px;
  }
  .tu-card-thumb .ic {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    color: var(--ink-3);
    z-index: 1;
  }
  .tu-card-thumb .ic svg { width: 40px; height: 40px; }
  .tu-card.cat-1 .tu-card-thumb .ic { color: var(--t-cat-1); }
  .tu-card.cat-2 .tu-card-thumb .ic { color: var(--t-cat-2); }
  .tu-card.cat-3 .tu-card-thumb .ic { color: var(--t-cat-3); }
  .tu-card.cat-4 .tu-card-thumb .ic { color: var(--t-cat-4); }
  .tu-card.cat-5 .tu-card-thumb .ic { color: var(--t-cat-5); }
  .tu-card-thumb .play-overlay {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0,0,0,0);
    transition: background .2s ease;
    z-index: 2;
  }
  .tu-card-thumb .play-circle {
    width: 52px; height: 52px;
    border-radius: 50%;
    background: rgba(255,255,255,0.95);
    color: var(--ink);
    display: inline-flex; align-items: center; justify-content: center;
    transform: scale(0.85); opacity: 0;
    transition: transform .2s ease, opacity .2s ease;
    box-shadow: 0 8px 20px rgba(0,0,0,0.25);
  }
  .tu-card-thumb .play-circle svg { width: 20px; height: 20px; }
  .tu-card:hover .tu-card-thumb .play-overlay { background: rgba(0,0,0,0.18); }
  .tu-card:hover .tu-card-thumb .play-circle { transform: scale(1); opacity: 1; }
  .tu-card-dur {
    position: absolute;
    bottom: 10px; inset-inline-start: 10px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    padding: 3px 8px;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
    z-index: 3;
  }
  .tu-card-body { padding: 14px 16px 16px; }
  .tu-card-cat {
    display: inline-flex; align-items: center; gap: 5px;
    font-size: 10.5px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase;
    padding: 2px 8px;
    border-radius: 999px;
    margin-bottom: 8px;
  }
  .tu-card.cat-1 .tu-card-cat { background: color-mix(in oklab, var(--t-cat-1) 14%, transparent); color: var(--t-cat-1); }
  .tu-card.cat-2 .tu-card-cat { background: color-mix(in oklab, var(--t-cat-2) 14%, transparent); color: var(--t-cat-2); }
  .tu-card.cat-3 .tu-card-cat { background: color-mix(in oklab, var(--t-cat-3) 18%, transparent); color: color-mix(in oklab, var(--t-cat-3) 80%, black); }
  .tu-card.cat-4 .tu-card-cat { background: color-mix(in oklab, var(--t-cat-4) 14%, transparent); color: var(--t-cat-4); }
  .tu-card.cat-5 .tu-card-cat { background: color-mix(in oklab, var(--t-cat-5) 14%, transparent); color: var(--t-cat-5); }
  .tu-card-title {
    font-family: var(--font-display);
    font-size: 15.5px; font-weight: 700;
    margin: 0 0 6px;
    line-height: 1.3;
    letter-spacing: -0.008em;
  }
  .tu-card-desc {
    font-size: 12.5px; color: var(--ink-3);
    line-height: 1.5;
    margin: 0 0 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .tu-card-meta {
    display: flex; align-items: center; gap: 12px;
    font-size: 11.5px; color: var(--ink-3);
  }
  .tu-card-meta .item { display: inline-flex; align-items: center; gap: 4px; }
  .tu-card-meta svg { width: 12px; height: 12px; }
  .tu-card-meta .new {
    margin-inline-start: auto;
    background: var(--ok-soft); color: var(--ok);
    padding: 2px 8px; border-radius: 999px;
    font-size: 10px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase;
  }

  /* Empty state */
  .tu-empty {
    padding: 64px 32px;
    text-align: center;
    color: var(--ink-3);
  }
  .tu-empty-ic {
    width: 56px; height: 56px;
    border-radius: 16px;
    background: var(--bg-sunk);
    color: var(--ink-3);
    display: inline-flex; align-items: center; justify-content: center;
    margin: 0 auto 14px;
  }
  .tu-empty-ic svg { width: 28px; height: 28px; }
  .tu-empty h3 { font-family: var(--font-display); font-size: 18px; margin: 0 0 6px; color: var(--ink); }
  .tu-empty p { margin: 0; font-size: 13.5px; }

  /* Player modal */
  .tu-player {
    position: fixed; inset: 0;
    z-index: 100;
    background: rgba(0,0,0,0.78);
    backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    padding: 32px;
    animation: tuFade .2s ease;
  }
  @keyframes tuFade { from { opacity: 0; } to { opacity: 1; } }
  .tu-player-content {
    background: var(--ink); color: #fff;
    border-radius: 22px;
    width: 100%; max-width: 960px;
    max-height: 90vh;
    overflow: hidden;
    display: flex; flex-direction: column;
    box-shadow: 0 40px 80px rgba(0,0,0,0.5);
  }
  .tu-player-vid {
    position: relative;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, color-mix(in oklab, var(--accent) 40%, #000), color-mix(in oklab, var(--ok) 30%, #000));
  }
  .tu-player-vid::before {
    content: "";
    position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: radial-gradient(circle at 50% 50%, #000 0%, transparent 80%);
  }
  .tu-player-vid-msg {
    position: absolute; inset: 0;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    z-index: 1;
    color: rgba(255,255,255,0.65);
    font-size: 14px;
    gap: 14px;
    text-align: center;
    padding: 32px;
  }
  .tu-player-vid-msg svg { width: 56px; height: 56px; opacity: 0.6; }
  .tu-player-vid-msg b { color: #fff; font-weight: 600; font-size: 16px; }
  .tu-player-info {
    padding: 22px 28px;
    border-top: 1px solid rgba(255,255,255,0.06);
  }
  .tu-player-cat {
    font-size: 11px; color: var(--accent-2);
    font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
    margin-bottom: 6px;
  }
  .tu-player-title {
    font-family: var(--font-display);
    font-size: 20px; font-weight: 700;
    margin: 0 0 6px;
    color: #fff;
    letter-spacing: -0.012em;
  }
  .tu-player-meta {
    font-size: 12.5px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 14px;
    display: flex; flex-wrap: wrap; gap: 6px 16px;
  }
  .tu-player-desc {
    font-size: 14px;
    color: rgba(255,255,255,0.82);
    line-height: 1.6;
    margin: 0;
  }
  .tu-player-close {
    appearance: none; border: 0; cursor: pointer;
    background: rgba(255,255,255,0.1);
    color: #fff;
    width: 38px; height: 38px;
    border-radius: 50%;
    display: inline-flex; align-items: center; justify-content: center;
    position: absolute; top: 22px; inset-inline-end: 22px;
    z-index: 5;
    transition: background .15s ease;
  }
  .tu-player-close:hover { background: rgba(255,255,255,0.2); }
  .tu-player-close svg { width: 16px; height: 16px; }

  /* Footer */
  .tu-footer {
    background: var(--bg-elev); border-top: 0.5px solid var(--line);
    padding: 32px;
    text-align: center; color: var(--ink-3); font-size: 12.5px;
    margin-top: 64px;
  }
  .tu-footer-links {
    display: inline-flex; gap: 18px; flex-wrap: wrap; justify-content: center;
    margin-bottom: 8px;
  }
  .tu-footer-links a { color: var(--ink-2); font-weight: 500; }


  /* ── Inherited Global Header + Footer styles ── */
/* ── Global header ── */
  .gh {
    position: sticky; top: 0; z-index: 50;
    background: color-mix(in oklab, var(--bg-elev) 90%, transparent);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 0.5px solid var(--line);
  }
  .gh-inner {
    max-width: 1440px; margin: 0 auto;
    padding: 0 32px;
    height: 60px;
    display: flex; align-items: center; gap: 28px;
  }
  .gh-logo {
    display: inline-flex; align-items: center; gap: 10px;
    text-decoration: none; color: var(--ink); flex-shrink: 0;
  }
  .gh-logo-mark {
    width: 32px; height: 32px;
    border-radius: 9px;
    background: linear-gradient(135deg, var(--accent), color-mix(in oklab, var(--accent) 60%, var(--ok)));
    color: #fff;
    display: inline-flex; align-items: center; justify-content: center;
    font-family: var(--font-mono); font-weight: 700; font-size: 16px;
    box-shadow: 0 4px 12px color-mix(in oklab, var(--accent) 32%, transparent),
                inset 0 1px 0 rgba(255,255,255,0.2);
    position: relative;
  }
  .gh-logo-mark::after {
    content: ""; position: absolute; inset: 4px;
    border-radius: 6px;
    border: 1.5px solid rgba(255,255,255,0.18);
  }
  .gh-logo-name {
    font-family: var(--font-display); font-size: 16px; font-weight: 700;
    letter-spacing: -0.01em; color: var(--ink);
  }
  .gh-logo-name span { color: var(--accent); font-weight: 800; }

  .gh-nav { display: flex; align-items: center; gap: 4px; flex: 1; }
  .gh-nav a {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 13.5px; font-weight: 500;
    color: var(--ink-2);
    text-decoration: none;
    transition: background .15s ease, color .15s ease;
  }
  .gh-nav a:hover { background: var(--bg-sunk); color: var(--ink); text-decoration: none; }
  .gh-nav a.active { background: var(--accent-soft); color: var(--accent-ink); font-weight: 600; }
  .gh-nav a svg { width: 14px; height: 14px; }

  .gh-actions { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
  .gh-search { position: relative; width: 240px; }
  .gh-search input {
    width: 100%; height: 34px;
    padding: 0 36px 0 12px;
    border: 0.5px solid var(--line);
    border-radius: 999px;
    background: var(--bg);
    color: var(--ink);
    font: inherit; font-size: 13px;
    outline: none;
    transition: border-color .15s ease;
  }
  .gh-search input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
  .gh-search svg {
    position: absolute; right: 12px; top: 50%;
    transform: translateY(-50%);
    width: 14px; height: 14px; color: var(--ink-3); pointer-events: none;
  }
  .gh-search kbd {
    position: absolute; left: 8px; top: 50%;
    transform: translateY(-50%);
    background: var(--bg-sunk);
    border: 0.5px solid var(--line);
    border-radius: 4px;
    padding: 1px 6px;
    font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-3);
  }

  .gh-iconbtn {
    appearance: none; border: 0; cursor: pointer;
    width: 36px; height: 36px;
    border-radius: 50%;
    background: transparent;
    color: var(--ink-2);
    display: inline-flex; align-items: center; justify-content: center;
    position: relative;
    transition: background .15s ease, color .15s ease;
  }
  .gh-iconbtn:hover { background: var(--bg-sunk); color: var(--ink); }
  .gh-iconbtn svg { width: 18px; height: 18px; }
  .gh-iconbtn .bdg {
    position: absolute; top: 6px; left: 6px;
    min-width: 16px; height: 16px;
    padding: 0 4px;
    border-radius: 999px;
    background: var(--warn); color: #fff;
    font-size: 9.5px; font-weight: 700;
    display: inline-flex; align-items: center; justify-content: center;
    border: 1.5px solid var(--bg-elev);
    line-height: 1;
  }

  .gh-streak {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 12px 6px 8px;
    border-radius: 999px;
    background: linear-gradient(90deg,
      color-mix(in oklab, #f5b91e 18%, var(--bg-elev)),
      var(--bg-elev) 80%);
    border: 0.5px solid color-mix(in oklab, #f5b91e 30%, var(--line));
    font-size: 12.5px; font-weight: 600; color: var(--ink);
  }
  .gh-streak svg { width: 16px; height: 16px; color: #c89100; }
  .gh-streak b { color: #8a6800; font-variant-numeric: tabular-nums; }

  .gh-avatar {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 4px 4px 4px 10px;
    border-radius: 999px;
    border: 0.5px solid var(--line);
    background: var(--bg-elev);
    cursor: pointer; font: inherit;
    transition: background .15s ease;
  }
  .gh-avatar:hover { background: var(--bg-sunk); border-color: color-mix(in oklab, var(--accent) 22%, var(--line)); }
  .gh-avatar-pic {
    width: 30px; height: 30px;
    border-radius: 50%;
    background: linear-gradient(135deg, #f5b91e, #c75a3a);
    color: #fff;
    display: inline-flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 12.5px;
  }
  .gh-avatar-text { display: flex; flex-direction: column; line-height: 1.2; padding-inline-end: 4px; }
  .gh-avatar-name { font-size: 12.5px; font-weight: 600; color: var(--ink); }
  .gh-avatar-role { font-size: 10.5px; color: var(--ink-3); }

  

/* ── Footer ── */
  .gf { margin-top: 64px; background: var(--bg-elev); border-top: 0.5px solid var(--line); }
  .gf-inner { max-width: 1440px; margin: 0 auto; padding: 48px 32px 32px; }
  .gf-grid {
    display: grid;
    grid-template-columns: 1.4fr repeat(4, 1fr);
    gap: 40px; margin-bottom: 36px;
  }
  .gf-brand p { font-size: 13.5px; color: var(--ink-2); line-height: 1.6; margin: 12px 0 18px; max-width: 32ch; }
  .gf-social { display: flex; gap: 6px; }
  .gf-social a {
    width: 34px; height: 34px;
    border-radius: 9px;
    border: 0.5px solid var(--line);
    color: var(--ink-2);
    display: inline-flex; align-items: center; justify-content: center;
    transition: background .15s ease, color .15s ease;
  }
  .gf-social a:hover { background: var(--bg-sunk); color: var(--accent); }
  .gf-social svg { width: 16px; height: 16px; }
  .gf-col h4 {
    font-family: var(--font-display);
    font-size: 12px; font-weight: 600;
    letter-spacing: 0.06em; text-transform: uppercase;
    color: var(--ink-3); margin: 0 0 14px;
  }
  .gf-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
  .gf-col a { font-size: 13.5px; color: var(--ink-2); text-decoration: none; }
  .gf-col a:hover { color: var(--ink); text-decoration: none; }
  .gf-bottom {
    border-top: 0.5px solid var(--line-2);
    padding-top: 22px;
    display: flex; align-items: center; gap: 16px;
    font-size: 12px; color: var(--ink-3);
  }
  .gf-bottom .spacer { flex: 1; }
  .gf-bottom a { color: var(--ink-3); }
  .gf-mentor {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 4px 10px; border-radius: 999px;
    background: var(--bg-sunk); color: var(--ink-2);
    font-size: 11.5px;
  }
  .gf-mentor svg { width: 12px; height: 12px; color: var(--ok); }

  

  /* Guest CTAs in header — real <a> tags rendered always, shown only in guest mode */
  .gh-guest-cta { display: none; }
  html[data-viewer="guest"] .gh-guest-cta {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 16px;
    border-radius: 999px;
    font: inherit; font-size: 13px; font-weight: 600;
    text-decoration: none;
    transition: background .15s ease, color .15s ease, border-color .15s ease;
    white-space: nowrap;
  }
  html[data-viewer="guest"] .gh-guest-cta.primary {
    background: var(--ink); color: var(--bg-elev);
    box-shadow: 0 4px 12px color-mix(in oklab, var(--ink) 18%, transparent);
  }
  html[data-viewer="guest"] .gh-guest-cta.primary:hover { background: var(--ink-2); text-decoration: none; }
  html[data-viewer="guest"] .gh-guest-cta.ghost {
    background: transparent;
    color: var(--ink-2);
    border: 0.5px solid var(--line);
  }
  html[data-viewer="guest"] .gh-guest-cta.ghost:hover {
    background: var(--bg-sunk); color: var(--ink); text-decoration: none;
  }
  /* Guest-mode hides irrelevant chrome */
  html[data-viewer="guest"] .gh-avatar,
  html[data-viewer="guest"] .gh-streak,
  html[data-viewer="guest"] .gh-iconbtn:has(.bdg) { display: none !important; }

  /* Category select box — desktop uses the chip row, mobile uses this <select>. */
  .tu-cat-select { display: none; }

  /* Mobile: widen the central content — the hero / featured / sections kept a
     fixed 32px side gutter (and the featured block added 36px inner padding on
     top of a 32px margin), so the column was very narrow on phones. */
  @media (max-width: 640px) {
    .tu-hero { padding: 30px 16px 18px; }
    .tu-section { padding: 0 16px; }
    .tu-feat {
      margin-left: 16px;
      margin-right: 16px;
      padding: 24px 20px;
    }

    /* Stack the controls so search + select each take the full width. */
    .tu-controls { flex-direction: column; align-items: stretch; gap: 10px; }
    .tu-search { flex: none; min-width: 0; width: 100%; }
    .tu-search input { width: 100%; box-sizing: border-box; }

    /* Chips -> a full-width native select box on mobile. */
    .tu-chips { display: none; }
    .tu-cat-select {
      display: block;
      width: 100%;
      box-sizing: border-box;
      appearance: none;
      -webkit-appearance: none;
      background-color: var(--bg-elev);
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23889' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: left 14px center;
      background-size: 16px;
      color: var(--ink);
      border: 1px solid var(--line);
      border-radius: 12px;
      padding: 12px 16px 12px 40px;
      font-family: var(--font-body);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      outline: none;
    }
    .tu-cat-select:focus { border-color: var(--accent); }
  }