/* ── AiMatrix Site · Shared Design System ── */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700;900&family=DM+Mono:wght@400;500&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  --ink: #1a1410;
  --paper: #faf8f4;
  --cream: #f2ede4;
  --warm-mid: #c8bba8;
  --accent: #c0392b;
  --accent-light: #e8d5d3;
  --gold: #a0824a;
  --gold-light: #f0e6d0;
  --ink-soft: #4a3f35;
  --border: #ddd5c8;
  --nav-h: 64px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Noto Sans SC', sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 15% 40%, rgba(160,130,74,0.04) 0%, transparent 50%),
    radial-gradient(circle at 85% 15%, rgba(192,57,43,0.03) 0%, transparent 40%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4'%3E%3Crect width='4' height='4' fill='%23faf8f4'/%3E%3Ccircle cx='1' cy='1' r='0.4' fill='%23d4c9b8' opacity='0.25'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

.wrap { position: relative; z-index: 1; max-width: 1140px; margin: 0 auto; padding: 0 40px; }

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(250,248,244,0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.nav-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 1;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

.nav-logo-mark {
  width: 30px; height: 30px;
  background: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--paper);
  font-family: 'Noto Serif SC', serif;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: -0.05em;
  flex-shrink: 0;
}

.nav-logo-text {
  font-family: 'Noto Serif SC', serif;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav-logo-sub {
  font-family: 'DM Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  text-transform: uppercase;
  margin-top: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 14px;
  transition: color 0.2s;
  letter-spacing: 0.03em;
}

.nav-links a:hover, .nav-links a.active { color: var(--ink); }

.nav-links a.active {
  border-bottom: 2px solid var(--accent);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-ghost {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  padding: 7px 16px;
  border: 1.5px solid var(--border);
  transition: border-color 0.2s, background 0.2s;
  letter-spacing: 0.04em;
  font-family: inherit;
  cursor: pointer;
  background: transparent;
}

.btn-ghost:hover { border-color: var(--ink); background: var(--cream); }

.btn-primary {
  font-size: 13px;
  font-weight: 700;
  color: var(--paper);
  background: var(--ink);
  text-decoration: none;
  padding: 8px 18px;
  letter-spacing: 0.05em;
  transition: background 0.2s;
  font-family: inherit;
  cursor: pointer;
  border: none;
  text-transform: uppercase;
}

.btn-primary:hover { background: #2e221a; }

.btn-accent {
  font-size: 13px;
  font-weight: 700;
  color: white;
  background: var(--accent);
  text-decoration: none;
  padding: 8px 18px;
  letter-spacing: 0.05em;
  transition: background 0.2s;
  font-family: inherit;
  cursor: pointer;
  border: none;
}

.btn-accent:hover { background: #a93226; }


/* ── SECTION HEADS ── */
.section-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

.section-head h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: 22px;
  font-weight: 700;
  white-space: nowrap;
}

.section-line { flex: 1; height: 1px; background: var(--border); }

.section-badge {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  border: 1px solid var(--border);
  padding: 3px 8px;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ── MONO TAG ── */
.mono-tag {
  display: inline-block;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 10px;
  background: var(--ink);
  color: var(--paper);
}

/* ── FOOTER ── */
footer {
  border-top: 2px solid var(--ink);
  margin-top: 80px;
  background: var(--ink);
  color: var(--paper);
}

.footer-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 56px 40px 40px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-brand h3 {
  font-family: 'Noto Serif SC', serif;
  font-size: 20px;
  font-weight: 900;
  margin-bottom: 10px;
}

.footer-brand p {
  font-size: 13px;
  color: var(--warm-mid);
  line-height: 1.8;
  max-width: 280px;
}

.footer-col h4 {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--warm-mid);
  margin-bottom: 16px;
}

.footer-col ul { list-style: none; }

.footer-col ul li { margin-bottom: 10px; }

.footer-col ul li a {
  text-decoration: none;
  color: var(--warm-mid);
  font-size: 13px;
  transition: color 0.2s;
}

.footer-col ul li a:hover { color: var(--paper); }

.footer-bottom {
  max-width: 1140px;
  margin: 0 auto;
  padding: 20px 40px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-bottom p {
  font-size: 12px;
  color: var(--warm-mid);
  font-family: 'DM Mono', monospace;
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.anim-up { animation: fadeUp 0.7s ease backwards; }
.anim-up-1 { animation: fadeUp 0.7s 0.1s ease backwards; }
.anim-up-2 { animation: fadeUp 0.7s 0.2s ease backwards; }
.anim-up-3 { animation: fadeUp 0.7s 0.3s ease backwards; }
.anim-up-4 { animation: fadeUp 0.7s 0.4s ease backwards; }

/* ── MOBILE NAV ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: all 0.3s;
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
  .wrap { padding: 0 20px; }
  .nav-inner { padding: 0 20px; }
}

@media (max-width: 600px) {
  .footer-inner { grid-template-columns: 1fr; }
}