/* =================================================
   page.css — /page/ 目录通用样式
   所有 /page/ 下的单页均引用此文件
   ================================================= */

/* ── Variables（与首页完全一致）── */
:root {
  --bg:           #fdf6ec;
  --bg-warm:      #f7efe2;
  --text-primary: #2c2416;
  --text-muted:   #9a8878;
  --text-faint:   #c4b49e;
  --accent:       #8b6840;
  --accent-light: #c4976a;
  --border:       #e8d8c4;
  --footer-bg:    #f0e6d6;
  --font-serif:   'Noto Serif SC', serif;
  --font-display: 'Playfair Display', serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-serif);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── Noise grain overlay ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.018;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px;
}

/* ══════════════════════════════════════
   Nav
══════════════════════════════════════ */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 2.5rem;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(253, 246, 236, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.site-nav.scrolled {
  border-bottom-color: var(--border);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--text-primary);
}

.nav-logo i {
  color: var(--accent);
  font-size: 0.9rem;
}

.nav-logo span {
  font-family: var(--font-serif);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-links a {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.22s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 1px;
  background: var(--accent-light);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.28s ease;
}

.nav-links a:hover  { color: var(--accent); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--accent); }

/* ══════════════════════════════════════
   Hero
══════════════════════════════════════ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6rem 2rem 4rem;
  position: relative;
  text-align: center;
  background-image:
    radial-gradient(ellipse at 15% 60%, rgba(196,151,106,0.07) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 25%, rgba(139,104,64,0.05) 0%, transparent 50%);
}

/* 背景装饰大字 */
.hero-year {
  position: absolute;
  font-family: var(--font-display);
  font-size: clamp(6rem, 18vw, 14rem);
  font-weight: 500;
  color: rgba(196,151,106,0.055);
  letter-spacing: -0.02em;
  user-select: none;
  pointer-events: none;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  white-space: nowrap;
  line-height: 1;
}

.hero-eyebrow {
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  color: var(--accent-light);
  text-transform: uppercase;
  margin-bottom: 1.6rem;
  opacity: 0;
  transform: translateY(10px);
  animation: fadeUp 0.8s 0.2s ease forwards;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  margin-bottom: 1.8rem;
  opacity: 0;
  transform: translateY(12px);
  animation: fadeUp 0.9s 0.35s ease forwards;
}

.hero-title em {
  font-style: italic;
  color: var(--accent);
}

.hero-divider {
  width: 32px;
  height: 1px;
  background: var(--border);
  margin: 0 auto 1.8rem;
  opacity: 0;
  animation: fadeIn 0.8s 0.55s ease forwards;
}

.hero-desc {
  max-width: 440px;
  font-size: 0.82rem;
  line-height: 2;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  opacity: 0;
  transform: translateY(8px);
  animation: fadeUp 0.9s 0.65s ease forwards;
}

/* ══════════════════════════════════════
   Content wrapper
══════════════════════════════════════ */
.content {
  position: relative;
  z-index: 1;
}

/* ══════════════════════════════════════
   Section 通用
══════════════════════════════════════ */
.section {
  padding: 5rem 2rem;
  max-width: 720px;
  margin: 0 auto;
}

.section + .section {
  border-top: 1px solid var(--border);
}

.section-label {
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  color: var(--accent-light);
  text-transform: uppercase;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
  max-width: 40px;
}

/* ══════════════════════════════════════
   Story Section
══════════════════════════════════════ */
.story-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem 4rem;
  align-items: start;
}

.story-main h2 {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.01em;
  margin-bottom: 1.4rem;
  color: var(--text-primary);
}

.story-main h2 em {
  font-style: italic;
  color: var(--accent);
}

.story-main p {
  font-size: 0.82rem;
  line-height: 2.1;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.story-aside {
  padding-top: 0.4rem;
}

.story-aside p {
  font-size: 0.78rem;
  line-height: 2;
  color: var(--text-faint);
  letter-spacing: 0.03em;
  font-style: italic;
  font-family: var(--font-display);
}

.story-aside p + p {
  margin-top: 1.2rem;
}

/* ══════════════════════════════════════
   Timeline
══════════════════════════════════════ */
.timeline {
  display: flex;
  flex-direction: column;
}

.tl-item {
  display: grid;
  grid-template-columns: 64px 1px 1fr;
  gap: 0 1.6rem;
  align-items: start;
  padding-bottom: 2.4rem;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.tl-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.tl-year {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-align: right;
  padding-top: 0.15rem;
}

.tl-line {
  background: var(--border);
  position: relative;
  width: 1px;
  align-self: stretch;
}

.tl-line::before {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-light);
}

.tl-body {
  padding-bottom: 0.5rem;
}

.tl-title {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 0.04em;
  margin-bottom: 0.45rem;
}

.tl-desc {
  font-size: 0.74rem;
  line-height: 1.85;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ══════════════════════════════════════
   Principles Grid
══════════════════════════════════════ */
.principles-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
}

.principle-item {
  padding: 1.8rem 1.6rem;
  background: var(--bg-warm);
  border: 1px solid var(--border);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.55s ease, transform 0.55s ease, background 0.25s;
}

.principle-item:hover { background: #f3e8d5; }

.principle-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.principle-num {
  font-family: var(--font-display);
  font-size: 0.62rem;
  color: var(--accent-light);
  letter-spacing: 0.15em;
  margin-bottom: 0.8rem;
}

.principle-title {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 0.05em;
  margin-bottom: 0.55rem;
}

.principle-desc {
  font-size: 0.72rem;
  line-height: 1.85;
  color: var(--text-muted);
}

/* ══════════════════════════════════════
   Closing Quote
══════════════════════════════════════ */
.closing {
  padding: 5rem 2rem 6rem;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.closing-mark {
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--border);
  line-height: 1;
  margin-bottom: 1.2rem;
  display: block;
}

.closing-quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  line-height: 1.7;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  margin-bottom: 1.6rem;
}

.closing-attr {
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  color: var(--text-faint);
}

/* ══════════════════════════════════════
   Footer
══════════════════════════════════════ */
.site-footer {
  background-color: var(--footer-bg);
  border-top: 1px solid var(--border);
  padding: 2.4rem 2rem 2rem;
  text-align: center;
}

.footer-inner {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
}

.footer-inner::before {
  content: '';
  display: block;
  width: 36px;
  height: 1px;
  background: var(--border);
  margin-bottom: 0.3rem;
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-decoration: none;
  position: relative;
  transition: color 0.22s;
}

.footer-nav a::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 1px;
  background: var(--accent-light);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.28s ease;
}

.footer-nav a:hover { color: var(--accent); }
.footer-nav a:hover::after { transform: scaleX(1); }

.footer-nav .sep {
  color: var(--text-faint);
  font-size: 0.6rem;
  user-select: none;
}

.footer-copy {
  font-size: 0.66rem;
  color: var(--text-faint);
  letter-spacing: 0.06em;
}

.footer-sub {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.63rem;
  color: var(--text-faint);
  opacity: 0.65;
}

/* ══════════════════════════════════════
   Animations
══════════════════════════════════════ */
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

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

/* ══════════════════════════════════════
   Scrollbar
══════════════════════════════════════ */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ══════════════════════════════════════
   Responsive
══════════════════════════════════════ */
@media (max-width: 680px) {
  .site-nav  { padding: 0 1.4rem; }
  .nav-links { gap: 1.2rem; }

  .hero    { padding: 5rem 1.5rem 3rem; }
  .section { padding: 3.5rem 1.5rem; }

  .story-body {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .story-aside {
    border-top: 1px solid var(--border);
    padding-top: 1.6rem;
  }

  .principles-grid { grid-template-columns: 1fr; }

  .tl-item { grid-template-columns: 48px 1px 1fr; gap: 0 1rem; }

  .closing { padding: 3.5rem 1.5rem 4.5rem; }
}

@media (max-width: 400px) {
  .nav-links a:not(:last-child) { display: none; }
}