/* ============================================================
   Janye Ceramic — shared design system
   Architectural-industrial · warm-neutral paper + copper accent
   ============================================================ */

:root {
  --bg:      #f5f3ef;
  --surface: #ffffff;
  --paper:   #ebe7e0;
  --ink:     #161719;
  --fg:      #0d0e10;
  --muted:   #6a6a6d;
  --line:    #161719;
  --border:  #d5d0c7;
  --accent:  #c15328;
  --accent-hover: #9c3f1e;
  --dark:    #141516;
  --dark-fg: #f0ebde;
  --dark-muted: #8f8a7d;

  --font-display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', system-ui, 'Helvetica Neue', sans-serif;
  --font-body:    -apple-system, BlinkMacSystemFont, 'SF Pro Text', system-ui, 'Helvetica Neue', sans-serif;
  --font-mono:    'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --maxw: 1440px;
  --pad-x: clamp(24px, 4vw, 56px);
  --section-y: clamp(72px, 10vw, 128px);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; color: inherit; }

/* ============================================================
   Layout primitives
   ============================================================ */

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad-x); }
.wrap-narrow { max-width: 960px; margin: 0 auto; padding: 0 var(--pad-x); }

section { padding: var(--section-y) 0; }
section + section { border-top: 1px solid var(--border); }

.rule { height: 1px; background: var(--line); border: 0; }
.rule-soft { height: 1px; background: var(--border); border: 0; }

/* ============================================================
   Typography
   ============================================================ */

.font-display { font-family: var(--font-display); font-weight: 500; letter-spacing: -0.03em; }
.font-mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--accent);
}
.eyebrow--dark { color: var(--dark-muted); }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 500; letter-spacing: -0.025em; color: var(--fg); }
h1 { font-size: clamp(48px, 6vw, 96px); line-height: 1.02; letter-spacing: -0.035em; }
h2 { font-size: clamp(36px, 4.4vw, 68px); line-height: 1.05; letter-spacing: -0.03em; }
h3 { font-size: clamp(22px, 2vw, 30px); line-height: 1.15; }
h4 { font-size: 17px; line-height: 1.25; letter-spacing: -0.01em; }

p { max-width: 60ch; }
.lead { font-size: clamp(18px, 1.6vw, 22px); line-height: 1.45; color: var(--ink); max-width: 62ch; }

/* ============================================================
   Global header / nav
   ============================================================ */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--bg) 90%, transparent);
  backdrop-filter: saturate(1.2) blur(12px);
  -webkit-backdrop-filter: saturate(1.2) blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  height: 68px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 40px;
}
.brand {
  display: inline-flex; align-items: baseline; gap: 8px;
  font-family: var(--font-display); font-weight: 600;
  font-size: 20px; letter-spacing: -0.02em;
}
.brand .mark {
  display: inline-grid; place-items: center;
  width: 28px; height: 28px;
  background: var(--fg); color: var(--bg);
  font-family: var(--font-mono); font-size: 12px; font-weight: 700;
  transform: translateY(3px);
}
.brand .co { color: var(--muted); font-weight: 400; font-size: 13px; letter-spacing: 0; margin-left: 6px; }

.nav-primary { display: flex; gap: 28px; justify-content: center; }
.nav-primary a {
  font-size: 14px; letter-spacing: -0.005em;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
.nav-primary a:hover { border-bottom-color: var(--accent); }
.nav-primary a.active { color: var(--fg); border-bottom-color: var(--accent); }

.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px;
  background: var(--fg); color: var(--bg);
  font-size: 13px; font-weight: 500;
  letter-spacing: 0.02em;
  transition: background 0.15s;
}
.nav-cta:hover { background: var(--accent); }


/* Language switcher */
.lang-switch {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.lang-switch a { color: var(--muted); padding: 4px 0; border-bottom: 1px solid transparent; transition: color 0.15s, border-color 0.15s; }
.lang-switch a:hover { color: var(--accent); }
.lang-switch a.active { color: var(--fg); border-bottom-color: var(--accent); }
.lang-switch .sep { color: var(--border); }

.nav-mobile-toggle { display: none; }

@media (max-width: 900px) {
  .site-header .wrap { grid-template-columns: auto 1fr auto; height: 60px; }
  .nav-primary { display: none; }
  .nav-mobile-toggle {
    display: inline-grid; place-items: center;
    width: 40px; height: 40px;
    border: 1px solid var(--line); background: transparent; cursor: pointer;
  }
  .nav-mobile-toggle svg { width: 18px; height: 18px; }
  .nav-cta { display: none; }
}

/* Off-canvas mobile menu */
.nav-mobile-panel {
  display: none;
  position: fixed; inset: 60px 0 0 0; z-index: 49;
  background: var(--bg);
  padding: 24px var(--pad-x) 40px;
  border-top: 1px solid var(--line);
  overflow-y: auto;
}
.nav-mobile-panel.open { display: flex; flex-direction: column; gap: 4px; }
.nav-mobile-panel a {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-display); font-size: 22px; font-weight: 500;
  letter-spacing: -0.02em;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-mobile-panel a .num {
  font-family: var(--font-mono); font-size: 11px; color: var(--muted);
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 14px 22px;
  font-family: var(--font-body); font-size: 14px; font-weight: 500;
  letter-spacing: 0.01em;
  border: 1px solid var(--line);
  background: transparent; color: var(--fg);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn:hover { background: var(--fg); color: var(--bg); }
.btn--primary { background: var(--fg); color: var(--bg); }
.btn--primary:hover { background: var(--accent); border-color: var(--accent); }
.btn--accent { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn--accent:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn--ghost { border-color: var(--border); }
.btn--ghost:hover { background: var(--paper); color: var(--fg); }
.btn--dark { background: transparent; color: var(--dark-fg); border-color: var(--dark-fg); }
.btn--dark:hover { background: var(--dark-fg); color: var(--dark); }
.btn .arrow { display: inline-block; transition: transform 0.2s; }
.btn:hover .arrow { transform: translateX(4px); }

/* ============================================================
   Product image placeholder — labelled slate blocks
   ============================================================ */

.slab {
  position: relative;
  overflow: hidden;
  background: var(--paper);
  aspect-ratio: 4 / 5;
}
.slab::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(120% 60% at 30% 20%, rgba(255,255,255,0.5), transparent 60%),
    radial-gradient(90% 60% at 80% 80%, rgba(0,0,0,0.12), transparent 60%),
    repeating-linear-gradient(37deg, rgba(22,23,25,0.03) 0 2px, transparent 2px 8px),
    linear-gradient(180deg, #e8e2d5, #d0c8b8);
}
.slab .slab-meta {
  position: absolute; left: 14px; bottom: 14px; right: 14px;
  display: flex; justify-content: space-between; align-items: flex-end;
  z-index: 2;
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(22,23,25,0.7);
  mix-blend-mode: multiply;
}
.slab .slab-meta .r { text-align: right; }
.slab.slab--dark::before {
  background:
    radial-gradient(120% 60% at 30% 20%, rgba(255,255,255,0.08), transparent 60%),
    repeating-linear-gradient(23deg, rgba(255,255,255,0.02) 0 2px, transparent 2px 9px),
    linear-gradient(180deg, #2a2b2d, #16171a);
}
.slab.slab--dark .slab-meta { color: rgba(240,235,222,0.7); mix-blend-mode: normal; }
.slab.slab--wood::before {
  background:
    repeating-linear-gradient(94deg, rgba(90,55,25,0.15) 0 3px, transparent 3px 11px),
    repeating-linear-gradient(88deg, rgba(30,15,5,0.1) 0 1px, transparent 1px 5px),
    linear-gradient(180deg, #b18a5c, #7a5432);
}
.slab.slab--marble::before {
  background:
    radial-gradient(60% 40% at 20% 30%, rgba(180,60,20,0.12), transparent 70%),
    radial-gradient(80% 60% at 80% 70%, rgba(30,30,40,0.15), transparent 70%),
    linear-gradient(180deg, #efe8dc, #d8ceb8);
}
.slab.slab--travertine::before {
  background:
    repeating-linear-gradient(2deg, rgba(140,95,45,0.14) 0 2px, transparent 2px 22px),
    linear-gradient(180deg, #dcc8a1, #b89a70);
}
.slab.slab--sandstone::before {
  background:
    radial-gradient(80% 50% at 50% 50%, rgba(120,80,40,0.15), transparent 70%),
    linear-gradient(180deg, #c8a878, #8e6c46);
}
.slab.slab--limestone::before {
  background:
    radial-gradient(100% 60% at 40% 30%, rgba(255,255,255,0.5), transparent 70%),
    linear-gradient(180deg, #ded8c9, #b4ac9a);
}
.slab.slab--cement::before {
  background:
    radial-gradient(100% 60% at 60% 20%, rgba(255,255,255,0.15), transparent 70%),
    repeating-linear-gradient(45deg, rgba(0,0,0,0.02) 0 3px, transparent 3px 14px),
    linear-gradient(180deg, #a8a49c, #7a7770);
}
.slab.slab--metal::before {
  background:
    linear-gradient(120deg, #6a6a6d 0%, #b8b4a8 40%, #46474a 70%, #8c8880 100%);
}
.slab.slab--spot::before {
  background:
    radial-gradient(3px 3px at 20% 30%, rgba(0,0,0,0.4), transparent 4px),
    radial-gradient(2px 2px at 60% 70%, rgba(0,0,0,0.3), transparent 3px),
    radial-gradient(4px 4px at 80% 20%, rgba(0,0,0,0.5), transparent 5px),
    radial-gradient(2px 2px at 30% 80%, rgba(0,0,0,0.35), transparent 3px),
    radial-gradient(3px 3px at 50% 50%, rgba(0,0,0,0.4), transparent 4px),
    linear-gradient(180deg, #e0dccf, #b8b0a0);
  background-size: 60px 60px, 40px 40px, 80px 80px, 50px 50px, 70px 70px, 100% 100%;
}
.slab.slab--cavestone::before {
  background:
    radial-gradient(30% 20% at 30% 40%, rgba(0,0,0,0.25), transparent 70%),
    radial-gradient(20% 15% at 70% 60%, rgba(0,0,0,0.3), transparent 70%),
    linear-gradient(180deg, #b8ac96, #7c705c);
}
.slab.slab--solid::before {
  background: linear-gradient(180deg, #1d1e20, #16171a);
}

/* ============================================================
   Data table (specs)
   ============================================================ */

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.spec-table th, .spec-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.spec-table th {
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 11px;
  border-bottom: 1px solid var(--line);
}
.spec-table tr:last-child td { border-bottom: 0; }
.spec-table td:first-child { color: var(--muted); width: 32%; }
.spec-table td.hi { color: var(--fg); }

/* ============================================================
   Chip / badge
   ============================================================ */

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.chip--accent { border-color: var(--accent); color: var(--accent); background: transparent; }
.chip--solid { background: var(--fg); color: var(--bg); border-color: var(--fg); }

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  background: var(--dark); color: var(--dark-fg);
  padding: 80px 0 40px;
  border-top: 0;
}
.site-footer .wrap { display: grid; gap: 56px; }
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(240,235,222,0.14);
}
.footer-brand h3 {
  color: var(--dark-fg);
  font-size: clamp(28px, 3vw, 44px);
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  max-width: 12ch;
}
.footer-brand p { color: var(--dark-muted); font-size: 14px; max-width: 34ch; }
.footer-col h5 {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--dark-muted); margin-bottom: 20px; font-weight: 500;
}
.footer-col ul { list-style: none; display: grid; gap: 12px; }
.footer-col a { color: var(--dark-fg); font-size: 14px; opacity: 0.85; }
.footer-col a:hover { opacity: 1; text-decoration: underline; text-underline-offset: 4px; text-decoration-color: var(--accent); }
.footer-bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--dark-muted);
}
.footer-bottom a { color: var(--dark-muted); }
.footer-bottom a:hover { color: var(--dark-fg); }

@media (max-width: 900px) {
  .footer-top { grid-template-columns: 1fr 1fr; gap: 40px 32px; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .footer-top { grid-template-columns: 1fr; }
}

/* ============================================================
   Utility
   ============================================================ */

.stack-4 > * + * { margin-top: 4px; }
.stack-8 > * + * { margin-top: 8px; }
.stack-12 > * + * { margin-top: 12px; }
.stack-16 > * + * { margin-top: 16px; }
.stack-20 > * + * { margin-top: 20px; }
.stack-24 > * + * { margin-top: 24px; }
.stack-32 > * + * { margin-top: 32px; }
.stack-40 > * + * { margin-top: 40px; }
.stack-48 > * + * { margin-top: 48px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-12 { display: grid; grid-template-columns: repeat(12, 1fr); gap: 24px; }
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .grid-12 { grid-template-columns: repeat(6, 1fr); }
}
@media (max-width: 560px) {
  .grid-4 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-12 { grid-template-columns: repeat(4, 1fr); }
}
/* ============================================================
   CJK typography — Chinese pages
   ============================================================ */

html[lang="zh-CN"] body,
html[lang="zh-CN"] .btn { font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'PingFang SC', 'Hiragino Sans GB', 'Noto Sans SC', 'Microsoft YaHei', system-ui, sans-serif; }
html[lang="zh-CN"] h1, html[lang="zh-CN"] h2, html[lang="zh-CN"] h3, html[lang="zh-CN"] h4,
html[lang="zh-CN"] .font-display,
html[lang="zh-CN"] .brand {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'PingFang SC', 'Hiragino Sans GB', 'Noto Sans SC', 'Microsoft YaHei', system-ui, sans-serif;
  letter-spacing: 0.01em;
}
html[lang="zh-CN"] h1 { line-height: 1.12; letter-spacing: 0.01em; }
html[lang="zh-CN"] h2 { line-height: 1.18; letter-spacing: 0.01em; }
html[lang="zh-CN"] .nav-mobile-panel a { letter-spacing: 0.02em; }

.center { text-align: center; }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.accent { color: var(--accent); }
.hide-mobile { display: initial; }
.show-mobile { display: none; }
@media (max-width: 720px) {
  .hide-mobile { display: none; }
  .show-mobile { display: initial; }
}