/* ============================================================
   Knife Library — shared stylesheet
   A card-catalog / archive aesthetic for Case XX collectors.
   ============================================================ */

:root {
  --paper: #EDE6D6;
  --paper-dim: #E2D9C4;
  --ink: #211D18;
  --ink-soft: #4A4237;
  --oxblood: #6B1F26;
  --oxblood-dark: #551419;
  --brass: #A8813C;
  --brass-light: #C9A46A;
  --walnut: #35241A;
  --walnut-dark: #241811;
  --olive: #5C6047;
  --line: rgba(33, 29, 24, 0.16);
  --line-strong: rgba(33, 29, 24, 0.35);
  --shadow-card: 0 1px 0 rgba(33,29,24,0.06), 0 8px 24px -18px rgba(33,29,24,0.4);

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #1B1712;
    --paper-dim: #221C15;
    --ink: #EFE7D8;
    --ink-soft: #C8BCA6;
    --oxblood: #C24C4F;
    --oxblood-dark: #9C3A3D;
    --brass: #D2A85E;
    --brass-light: #E4C787;
    --walnut: #120C08;
    --walnut-dark: #0A0705;
    --olive: #8B9270;
    --line: rgba(239, 231, 216, 0.14);
    --line-strong: rgba(239, 231, 216, 0.3);
    --shadow-card: 0 1px 0 rgba(0,0,0,0.4), 0 8px 24px -18px rgba(0,0,0,0.7);
  }
}

:root[data-theme="dark"] {
  --paper: #1B1712;
  --paper-dim: #221C15;
  --ink: #EFE7D8;
  --ink-soft: #C8BCA6;
  --oxblood: #C24C4F;
  --oxblood-dark: #9C3A3D;
  --brass: #D2A85E;
  --brass-light: #E4C787;
  --walnut: #120C08;
  --walnut-dark: #0A0705;
  --olive: #8B9270;
  --line: rgba(239, 231, 216, 0.14);
  --line-strong: rgba(239, 231, 216, 0.3);
  --shadow-card: 0 1px 0 rgba(0,0,0,0.4), 0 8px 24px -18px rgba(0,0,0,0.7);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; }

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Header ---------- */

.site-header {
  background: var(--walnut);
  color: var(--paper);
  border-bottom: 3px solid var(--brass);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
  gap: 24px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--paper);
}

.brand-mark {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--brass-light);
  border: 1px solid var(--brass);
  border-radius: 3px;
  padding: 2px 6px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.main-nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.main-nav a {
  text-decoration: none;
  color: var(--paper);
  font-size: 15px;
  padding: 8px 12px;
  border-radius: 3px;
  opacity: 0.82;
  transition: opacity 0.15s ease, background 0.15s ease;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  opacity: 1;
  background: rgba(201, 164, 106, 0.16);
}

.main-nav a[aria-current="page"] {
  opacity: 1;
  color: var(--brass-light);
  font-weight: 600;
}

/* ---------- Hero ---------- */

.hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--line);
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--oxblood);
  margin: 0 0 18px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 5.5vw, 64px);
  line-height: 1.04;
  font-weight: 600;
  margin: 0 0 22px;
  max-width: 15ch;
  letter-spacing: -0.01em;
}

.hero p.lede {
  font-size: 19px;
  color: var(--ink-soft);
  max-width: 56ch;
  margin: 0 0 0;
}

.hero-meta {
  margin-top: 28px;
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--ink-soft);
}

.hero-meta strong {
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 500;
}

/* ---------- Drawers (home page section cards) ---------- */

.drawers-section {
  padding: 56px 0 72px;
}

.drawers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

@media (max-width: 820px) {
  .drawers { grid-template-columns: 1fr; }
}

.drawer {
  position: relative;
  background: var(--paper-dim);
  border: 1px solid var(--line);
  border-top: 3px solid var(--brass);
  border-radius: 2px;
  padding: 26px 24px 24px;
  text-decoration: none;
  color: var(--ink);
  box-shadow: var(--shadow-card);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.drawer:hover,
.drawer:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 1px 0 rgba(33,29,24,0.08), 0 16px 30px -18px rgba(33,29,24,0.5);
}

.drawer-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--oxblood);
  margin: 0 0 12px;
}

.drawer h2 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 10px;
}

.drawer p {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0 0 16px;
}

.drawer-cta {
  font-size: 14px;
  font-weight: 600;
  color: var(--oxblood);
}

/* ---------- Section headers on interior pages ---------- */

.page-head {
  padding: 52px 0 36px;
  border-bottom: 1px solid var(--line);
}

.page-head .hero-eyebrow { margin-bottom: 14px; }

.page-head h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 4.5vw, 46px);
  font-weight: 600;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

.page-head p.lede {
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0;
}

/* ---------- Generic content sections ---------- */

.section {
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}

.section:last-of-type { border-bottom: none; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  margin: 0;
}

.section-note {
  font-size: 14px;
  color: var(--ink-soft);
  font-family: var(--font-mono);
}

/* ---------- Pattern cards ---------- */

.pattern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.pattern-card {
  border: 1px solid var(--line);
  background: var(--paper-dim);
  border-radius: 2px;
  padding: 20px;
}

.pattern-card .blade-count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--brass);
  background: rgba(168, 129, 60, 0.12);
  border: 1px solid rgba(168, 129, 60, 0.35);
  display: inline-block;
  padding: 2px 8px;
  border-radius: 2px;
  margin-bottom: 12px;
}

.pattern-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  margin: 0 0 8px;
  font-weight: 600;
}

.pattern-card p {
  font-size: 14.5px;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.pattern-card .also-known {
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px dashed var(--line-strong);
  padding-top: 10px;
  margin-top: 10px;
}

.pattern-card .also-known strong { color: var(--ink); font-weight: 600; }

/* ---------- Tang stamp timeline ---------- */

.stamp-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.stamp-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  align-items: start;
}

.stamp-row:first-child { border-top: none; }

@media (max-width: 640px) {
  .stamp-row { grid-template-columns: 1fr; gap: 10px; }
}

.stamp-years {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--oxblood);
  font-weight: 500;
  padding-top: 2px;
}

.stamp-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  background: var(--walnut);
  color: var(--brass-light);
  border-radius: 3px;
  padding: 6px 10px;
  margin-bottom: 10px;
}

.stamp-detail h3 {
  font-family: var(--font-display);
  font-size: 19px;
  margin: 0 0 6px;
  font-weight: 600;
}

.stamp-detail p {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0;
  max-width: 62ch;
}

.stamp-note {
  margin-top: 40px;
  background: rgba(168, 129, 60, 0.1);
  border: 1px solid rgba(168, 129, 60, 0.3);
  border-radius: 2px;
  padding: 18px 20px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.stamp-note strong { color: var(--ink); }

/* ---------- Materials swatches ---------- */

.material-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.material-card {
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
  background: var(--paper-dim);
}

.material-swatch {
  height: 84px;
  border-bottom: 1px solid var(--line);
}

.material-body { padding: 16px 18px 18px; }

.material-body h3 {
  font-family: var(--font-display);
  font-size: 18px;
  margin: 0 0 6px;
  font-weight: 600;
}

.material-body p {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0;
}

.material-era {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-soft);
  margin-top: 10px;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--walnut-dark);
  color: var(--paper);
  margin-top: 40px;
}

.site-footer .wrap {
  padding: 36px 28px 44px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.site-footer .foot-brand {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 8px;
}

.site-footer p {
  font-size: 13.5px;
  color: rgba(237, 230, 214, 0.65);
  max-width: 46ch;
  margin: 0;
}

.site-footer nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-self: start;
}

.site-footer nav a {
  color: rgba(237, 230, 214, 0.8);
  text-decoration: none;
  font-size: 14px;
}

.site-footer nav a:hover { color: var(--brass-light); }

/* ---------- Focus visibility ---------- */

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}