/* ============================================================
   THE CODEX PATH — golden-ratio design system
   φ = 1.618. Spacing scale below is built from it:
   8 · 13 · 21 · 34 · 55 · 89 · 144 (Fibonacci, converges on φ)
   ============================================================ */

:root{
  /* palette */
  --parchment: #F6F1E4;
  --parchment-deep: #EFE7D3;
  --ink: #1B2236;
  --ink-soft: #394259;
  --gold: #B07F25;
  --gold-bright: #C99A3E;
  --sienna: #7A4426;
  --pine: #2F4D3A;
  --rule: rgba(27, 34, 54, 0.14);

  /* type */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* fibonacci spacing scale */
  --sp-1: 8px;
  --sp-2: 13px;
  --sp-3: 21px;
  --sp-4: 34px;
  --sp-5: 55px;
  --sp-6: 89px;
  --sp-7: 144px;

  --radius: 3px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  background: var(--parchment);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

@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; }
}

a{ color: inherit; }
img, svg{ display: block; max-width: 100%; }

.grain-overlay{
  position: fixed; inset: 0; pointer-events: none; z-index: 1000;
  opacity: 0.035; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

h1, h2, h3{ font-family: var(--font-display); font-weight: 600; margin: 0; color: var(--ink); }
h1{ font-size: clamp(2.6rem, 5vw, 4.2rem); line-height: 1.05; letter-spacing: -0.01em; }
h1 em{ font-style: italic; color: var(--gold); }
h2{ font-size: clamp(1.9rem, 3vw, 2.6rem); line-height: 1.15; }
h3{ font-size: 1.3rem; }

.eyebrow{
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--sienna); margin: 0 0 var(--sp-2);
}

.section-head{ max-width: 700px; margin: 0 auto var(--sp-5); text-align: center; padding: 0 var(--sp-3); }
.section-lede{ font-size: 1.05rem; color: var(--ink-soft); margin-top: var(--sp-2); }

main > section{ padding: var(--sp-7) var(--sp-3); max-width: 1180px; margin: 0 auto; }

/* ---------- buttons ---------- */
.btn{
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-body); font-weight: 600; font-size: 0.95rem;
  padding: 13px 26px; border-radius: var(--radius); text-decoration: none;
  border: 1px solid transparent; transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:focus-visible{ outline: 2px solid var(--gold); outline-offset: 3px; }
.btn-primary{ background: var(--ink); color: var(--parchment); }
.btn-primary:hover{ background: var(--gold); color: var(--ink); transform: translateY(-1px); }
.btn-ghost{ border-color: var(--ink); color: var(--ink); }
.btn-ghost:hover{ background: var(--ink); color: var(--parchment); }

/* ============== HEADER ============== */
.site-header{
  position: sticky; top: 0; z-index: 100;
  background: rgba(246, 241, 228, 0.92); backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--rule);
}
.header-inner{
  max-width: 1180px; margin: 0 auto; padding: var(--sp-2) var(--sp-3);
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3);
}
.brand{ display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-mark{ font-family: var(--font-display); font-size: 1.6rem; color: var(--gold); }
.brand-text{ font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; color: var(--ink); white-space: nowrap; }
.brand-sub{ font-weight: 500; color: var(--ink-soft); font-size: 0.95rem; }
.main-nav{ display: flex; gap: var(--sp-4); font-size: 0.9rem; font-weight: 500; }
.main-nav a{ text-decoration: none; color: var(--ink-soft); border-bottom: 1px solid transparent; }
.main-nav a:hover{ color: var(--ink); border-color: var(--gold); }
@media (max-width: 720px){ .main-nav{ display: none; } }

/* ============== HERO ============== */
.hero{ padding-top: var(--sp-6); }
.hero-inner{
  display: grid; grid-template-columns: 1.618fr 1fr; gap: var(--sp-5);
  align-items: center;
}
@media (max-width: 880px){ .hero-inner{ grid-template-columns: 1fr; } .hero-spiral{ order: -1; max-width: 320px; margin: 0 auto; } }

.hero-lede{ max-width: 46ch; color: var(--ink-soft); font-size: 1.08rem; margin: var(--sp-3) 0 var(--sp-4); }
.hero-actions{ display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-bottom: var(--sp-4); }
.hero-stat{ font-family: var(--font-mono); font-size: 0.82rem; color: var(--ink-soft); }
.hero-stat span{ color: var(--gold); font-weight: 600; }

.hero-spiral svg{ width: 100%; }
.spiral-rect{ fill: none; stroke: var(--ink); stroke-width: 1; opacity: 0.55; }
.spiral-arc{ fill: none; stroke: var(--gold); stroke-width: 2.4; stroke-linecap: round; }

/* ============== PHASE LIST ============== */
.phase-list{ list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--sp-3); }
.phase-card{
  border: 1px solid var(--rule); background: #fff; border-radius: var(--radius);
  padding: var(--sp-4); display: grid; grid-template-columns: auto 1fr; gap: var(--sp-4);
  position: relative; overflow: hidden;
}
.phase-card::before{
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--gold);
}
.phase-num{
  font-family: var(--font-mono); font-size: 0.95rem; color: var(--gold); font-weight: 600;
  display: flex; flex-direction: column; align-items: center; justify-content: flex-start; padding-top: 4px;
  min-width: 46px;
}
.phase-num .ratio-tag{ font-size: 0.62rem; color: var(--ink-soft); margin-top: 4px; }
.phase-title-row{ display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; justify-content: space-between; }
.phase-title-row h3{ margin: 0; }
.phase-tag{ font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--pine); border: 1px solid var(--pine); border-radius: 20px; padding: 3px 10px; white-space: nowrap; }
.phase-summary{ color: var(--ink-soft); margin: var(--sp-1) 0 var(--sp-2); max-width: 70ch; }
.phase-toggle{
  background: none; border: none; cursor: pointer; font-family: var(--font-mono); font-size: 0.8rem;
  color: var(--gold); padding: 0; display: flex; align-items: center; gap: 6px; font-weight: 600;
}
.phase-toggle:focus-visible{ outline: 2px solid var(--gold); outline-offset: 3px; }
.phase-toggle .chevron{ transition: transform 0.2s ease; display: inline-block; }
.phase-card.open .chevron{ transform: rotate(90deg); }
.phase-resources{
  list-style: none; margin: var(--sp-3) 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px,1fr));
  gap: var(--sp-2); max-height: 0; overflow: hidden; opacity: 0; transition: max-height 0.25s ease, opacity 0.2s ease;
}
.phase-card.open .phase-resources{ max-height: 1200px; opacity: 1; margin-top: var(--sp-3); }
.resource-link{
  display: block; padding: var(--sp-2); border: 1px solid var(--rule); border-radius: var(--radius);
  text-decoration: none; transition: border-color 0.15s ease, background 0.15s ease;
}
.resource-link:hover{ border-color: var(--gold); background: var(--parchment-deep); }
.resource-type{ font-family: var(--font-mono); font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--gold); display: block; margin-bottom: 4px; }
.resource-name{ font-weight: 600; font-size: 0.92rem; color: var(--ink); display: block; }
.resource-desc{ font-size: 0.82rem; color: var(--ink-soft); margin-top: 2px; }

/* ============== LIBRARY ============== */
.library-controls{ margin-bottom: var(--sp-4); display: flex; flex-direction: column; gap: var(--sp-2); align-items: center; }
#librarySearch{
  width: 100%; max-width: 480px; padding: 13px 18px; border: 1px solid var(--rule); border-radius: 30px;
  font-family: var(--font-body); font-size: 0.95rem; background: #fff;
}
#librarySearch:focus{ outline: 2px solid var(--gold); }
.filter-row{ display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.filter-chip{
  font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em;
  padding: 7px 14px; border-radius: 20px; border: 1px solid var(--ink); background: transparent; cursor: pointer;
  color: var(--ink);
}
.filter-chip[aria-pressed="true"]{ background: var(--ink); color: var(--parchment); }
.filter-chip:focus-visible{ outline: 2px solid var(--gold); outline-offset: 2px; }

.library-grid{ display: grid; grid-template-columns: repeat(auto-fill, minmax(260px,1fr)); gap: var(--sp-2); }
.library-empty{ text-align: center; color: var(--ink-soft); margin-top: var(--sp-4); }

/* ============== CERTIFICATE TABLE ============== */
.cert-table-wrap{ overflow-x: auto; border: 1px solid var(--rule); border-radius: var(--radius); background: #fff; }
.cert-table{ width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.cert-table th, .cert-table td{ padding: var(--sp-2) var(--sp-3); text-align: left; border-bottom: 1px solid var(--rule); }
.cert-table th{ font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--sienna); background: var(--parchment-deep); }
.cert-table tr:last-child td{ border-bottom: none; }
.cert-note{ text-align: center; color: var(--ink-soft); font-size: 0.85rem; margin-top: var(--sp-3); }
#certificate .section-head{ margin-bottom: var(--sp-4); }
#certificate .btn{ margin-top: var(--sp-2); }

/* ============== START / HOW TO USE ============== */
.start-grid{ display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: var(--sp-3); }
.start-card{ background: #fff; border: 1px solid var(--rule); border-radius: var(--radius); padding: var(--sp-4); }
.start-num{ font-family: var(--font-mono); color: var(--gold); font-weight: 600; display: block; margin-bottom: var(--sp-1); }
.start-card p{ color: var(--ink-soft); font-size: 0.92rem; margin: var(--sp-1) 0 0; }

/* ============== FOOTER ============== */
.site-footer{ border-top: 1px solid var(--rule); padding: var(--sp-5) var(--sp-3); text-align: center; }
.footer-brand{ font-family: var(--font-display); font-weight: 600; font-size: 1.1rem; margin: 0; }
.footer-brand span{ color: var(--gold); margin-left: 6px; font-family: var(--font-mono); font-size: 0.8rem; }
.footer-line{ color: var(--ink-soft); font-size: 0.85rem; margin-top: var(--sp-1); }