:root {
    --ink: #0a0f14;
    --ink-2: #0f1620;
    --surface: #131c27;
    --surface-2: #1a2532;
    --surface-3: #233040;
    --border: #243345;
    --border-soft: #1b2532;
    --text: #e8edf3;
    --text-soft: #b4c2d0;
    --text-mute: #7e8e9d;
    --flow: #14b8a6;
    --flow-2: #06b6d4;
    --fire: #f59e0b;
    --danger: #ef4444;
    --success: #22c55e;
    --indigo: #818cf8;
    --indigo-2: #6366f1;
    --serif: 'Fraunces', Georgia, serif;
    --sans: 'Manrope', system-ui, sans-serif;
    --mono: 'JetBrains Mono', ui-monospace, monospace;
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--sans); background: var(--ink); color: var(--text);
    line-height: 1.6; font-size: 16px; overflow-x: hidden; -webkit-font-smoothing: antialiased;
  }
  a { color: inherit; }
  :focus-visible { outline: 2px solid var(--flow); outline-offset: 2px; border-radius: 4px; }

  .bg-deco {
    position: fixed; inset: 0; z-index: -1; pointer-events: none;
    background:
      radial-gradient(ellipse 70% 45% at 20% -5%, rgba(20, 184, 166, 0.08), transparent 60%),
      radial-gradient(ellipse 60% 40% at 90% 10%, rgba(129, 140, 248, 0.06), transparent 60%),
      radial-gradient(ellipse 50% 40% at 60% 100%, rgba(239, 68, 68, 0.04), transparent 60%),
      var(--ink);
  }
  .bg-deco::before {
    content: ''; position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(36, 51, 69, 0.22) 1px, transparent 1px),
      linear-gradient(90deg, rgba(36, 51, 69, 0.22) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: radial-gradient(ellipse 80% 70% at 50% 20%, black 30%, transparent 80%);
  }

  .wrap { max-width: 1180px; margin: 0 auto; padding: 0 32px; }

  /* ===== Shared site bar ===== */
  .sitebar {
    position: sticky; top: 0; z-index: 60;
    backdrop-filter: blur(14px);
    background: rgba(10, 15, 20, 0.85);
    border-bottom: 1px solid var(--border-soft);
  }
  .sitebar-inner {
    max-width: 1180px; margin: 0 auto; padding: 12px 32px;
    display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  }
  .site-brand {
    display: flex; align-items: center; gap: 10px;
    font-family: var(--serif); font-weight: 600; font-style: italic; font-size: 16px;
    color: var(--text); text-decoration: none; white-space: nowrap;
  }
  .site-mark {
    width: 24px; height: 24px; border-radius: 7px;
    background: linear-gradient(135deg, var(--flow), var(--indigo-2));
    position: relative; overflow: hidden; flex-shrink: 0;
  }
  .site-mark::after { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.5), transparent 60%); }
  .site-links { display: flex; gap: 4px; flex-wrap: wrap; }
  .site-links a {
    font-family: var(--sans); font-size: 13px; color: var(--text-mute);
    text-decoration: none; padding: 6px 12px; border-radius: 8px; transition: all 0.18s; white-space: nowrap;
  }
  .site-links a:hover { color: var(--text); background: rgba(255,255,255,0.04); }
  .site-links a.active { color: var(--flow); background: rgba(20,184,166,0.1); font-weight: 600; }
  @media (max-width: 680px) {
    .site-links a { padding: 6px 9px; font-size: 12px; }
    .site-brand span { display: none; }
  }

  /* ===== Hero ===== */
  .hero { padding: 110px 0 84px; }
  .eyebrow {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 6px 14px; border: 1px solid var(--border); border-radius: 999px;
    font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em;
    text-transform: uppercase; color: var(--text-soft); margin-bottom: 32px;
  }
  .eyebrow::before {
    content: ''; width: 6px; height: 6px; border-radius: 50%;
    background: var(--flow); box-shadow: 0 0 0 4px rgba(20, 184, 166, 0.15);
  }
  h1.title {
    font-family: var(--serif); font-weight: 500;
    font-size: clamp(48px, 7.5vw, 104px); line-height: 0.96;
    letter-spacing: -0.04em; margin-bottom: 30px;
  }
  h1.title em { font-style: italic; font-weight: 400; color: var(--flow); }
  .lede {
    font-size: clamp(18px, 1.7vw, 23px); color: var(--text-soft);
    max-width: 720px; line-height: 1.5; margin-bottom: 40px;
  }
  .hero-meta { display: flex; gap: 40px; flex-wrap: wrap; padding-top: 32px; border-top: 1px solid var(--border-soft); }
  .meta-item .label { font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-mute); margin-bottom: 4px; }
  .meta-item .value { font-family: var(--serif); font-size: 18px; color: var(--text); }

  /* ===== Sections ===== */
  section.block { padding: 72px 0; }
  .block-head { margin-bottom: 40px; }
  .block-kicker {
    font-family: var(--mono); font-size: 12px; letter-spacing: 0.15em;
    color: var(--flow); margin-bottom: 14px; display: flex; align-items: center; gap: 12px;
  }
  .block-kicker::after { content: ''; flex: 1; height: 1px; background: linear-gradient(to right, var(--flow), transparent); opacity: 0.35; }
  h2.block-title { font-family: var(--serif); font-weight: 500; font-size: clamp(30px, 3.6vw, 46px); letter-spacing: -0.03em; line-height: 1.05; max-width: 760px; }
  .block-sub { font-size: 17px; color: var(--text-soft); max-width: 680px; margin-top: 16px; }

  /* ===== Conventions grid ===== */
  .conv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
  @media (max-width: 860px) { .conv-grid { grid-template-columns: 1fr 1fr; } }
  @media (max-width: 560px) { .conv-grid { grid-template-columns: 1fr; } }
  .conv {
    background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
    padding: 22px; transition: border-color 0.2s, transform 0.2s;
  }
  .conv:hover { border-color: var(--flow); transform: translateY(-2px); }
  .conv .conv-num { font-family: var(--mono); font-size: 11px; color: var(--text-mute); margin-bottom: 10px; }
  .conv .conv-title { font-family: var(--serif); font-size: 18px; line-height: 1.25; margin-bottom: 8px; color: var(--text); }
  .conv .conv-desc { font-size: 13.5px; color: var(--text-soft); }
  .conv .conv-title .k { color: var(--flow); font-style: italic; }

  /* ===== Guide cards ===== */
  .guides { display: grid; gap: 20px; }
  .guide-card {
    display: grid; grid-template-columns: 64px 1fr auto; gap: 28px; align-items: center;
    background: var(--surface); border: 1px solid var(--border); border-radius: 18px;
    padding: 30px 32px; text-decoration: none; color: inherit;
    transition: border-color 0.2s, transform 0.2s, background 0.2s; position: relative; overflow: hidden;
  }
  .guide-card::before {
    content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
    background: var(--gc); transition: width 0.2s;
  }
  .guide-card:hover { transform: translateY(-3px); border-color: var(--gc); }
  .guide-card:hover::before { width: 6px; }
  @media (max-width: 760px) {
    .guide-card { grid-template-columns: 1fr; gap: 16px; padding: 26px 24px; }
    .guide-arrow { display: none; }
  }
  .guide-num {
    font-family: var(--serif); font-size: 40px; font-weight: 500; color: var(--gc);
    line-height: 1; text-align: center;
  }
  .guide-main .guide-kicker { font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-mute); margin-bottom: 8px; }
  .guide-main .guide-title { font-family: var(--serif); font-size: 27px; letter-spacing: -0.02em; margin-bottom: 8px; color: var(--text); }
  .guide-main .guide-desc { font-size: 15px; color: var(--text-soft); margin-bottom: 14px; max-width: 620px; }
  .guide-tags { display: flex; flex-wrap: wrap; gap: 6px; }
  .guide-tags span {
    font-family: var(--mono); font-size: 11px; color: var(--text-soft);
    background: var(--ink-2); border: 1px solid var(--border); border-radius: 6px; padding: 3px 8px;
  }
  .guide-arrow {
    font-family: var(--serif); font-size: 28px; color: var(--gc);
    width: 48px; height: 48px; border: 1px solid var(--border); border-radius: 50%;
    display: flex; align-items: center; justify-content: center; transition: all 0.2s;
  }
  .guide-card:hover .guide-arrow { background: var(--gc); color: var(--ink); border-color: var(--gc); }

  /* ===== Note strip ===== */
  .note {
    background: var(--surface); border: 1px solid var(--border);
    border-left: 3px solid var(--flow); border-radius: 0 12px 12px 0;
    padding: 22px 26px; margin-top: 40px;
  }
  .note .note-tag { font-family: var(--mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.15em; color: var(--flow); margin-bottom: 8px; }
  .note p { font-size: 14px; color: var(--text-soft); margin: 0; }

  footer { padding: 72px 0 60px; border-top: 1px solid var(--border-soft); margin-top: 40px; text-align: center; }
  footer .closer { font-family: var(--serif); font-style: italic; font-size: 25px; color: var(--text); max-width: 600px; margin: 0 auto 20px; line-height: 1.3; }
  footer .signoff { font-family: var(--mono); font-size: 11px; color: var(--text-mute); letter-spacing: 0.1em; text-transform: uppercase; }

  @media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; } }