/* ── CSS Variables ── */
:root {
  --ink: #1c1a17;
  --ink-soft: #2e2b26;
  --paper: #faf7f2;
  --paper-warm: #f5f0e8;
  --paper-mid: #ede7da;
  --accent1: #8b6f47;
  --accent2: #c4956a;
  --accent3: #d4a96a;
  --accent-sage: #7a8c72;
  --accent-rose: #b87c6e;
  --text-main: #2e2b26;
  --text-mid: #5c5549;
  --text-soft: #8c8278;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--text-main);
  font-family: 'Noto Sans TC', sans-serif;
  font-weight: 300;
  line-height: 1.8;
  overflow-x: hidden;
}

/* ── Nav (sub-page back-button nav) ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1.2rem 2rem;
  background: rgba(28,26,23,0.92);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(250,247,242,0.06);
}
.nav-back {
  font-family: 'EB Garamond', serif;
  font-style: italic;
  font-size: 0.82rem;
  color: rgba(250,247,242,0.5);
  text-decoration: none;
  letter-spacing: 0.12em;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-back:hover { color: var(--accent3); }
.nav-back::before { content: '←'; font-style: normal; }
.nav-title {
  font-family: 'Noto Serif TC', serif;
  font-size: 0.8rem;
  color: rgba(250,247,242,0.35);
  letter-spacing: 0.18em;
}

/* ── Animations ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}