/* ════════════════════════════════════════════════════════════════
   牍 — GitHub Page · 青铜铭石·牍文铸刻
   对仗 wen（纸面雕版）：牍是青铜铸刻（锈色斑驳·凹凸铭文·铸边栏线）
   ════════════════════════════════════════════════════════════════ */

:root {
  /* 传世青铜底色 */
  --bronze-base:       #2b2620;
  --bronze-mid:        #3d352b;
  --bronze-dark:       #1a1714;
  --bronze-deep:       #0e0c0a;

  /* 新铸铜高光 */
  --bronze-gold:       #b08642;
  --bronze-highlight:  #d4a85a;

  /* 孔雀石铜绿锈 */
  --patina-green:      #3d6b5a;
  --patina-bright:     #4a8a73;
  --patina-deep:       #1f3d33;

  /* 朱砂（极少量点缀） */
  --cinnabar:          #8b2820;
  --cinnabar-bright:   #a83828;

  /* 铭文文字色 */
  --text-cast:         #c9a86a;   /* 阳文铸字：铜本色金黄 */
  --text-incised:      #0e0c0a;   /* 阴文凹字：深槽黑 */
  --text-soft:         #a89172;   /* 次级铭文 */
  --text-dim:          #6b5d48;   /* 最弱 */

  /* 字体 */
  --font-cn:          "Noto Serif SC", "Songti SC", "SimSun", "STSong", "Source Han Serif SC", serif;
  --font-cn-display:  "ZCOOL XiaoWei", "Noto Serif SC", "STKaiti", "KaiTi", serif;
  --font-cn-block:    "ZCOOL QingKe HuangYou", "Noto Serif SC", "STHeiti", sans-serif;
  --font-en-display:  "Cinzel", "Cormorant Garamond", "Times New Roman", serif;
  --font-en:          "Cormorant Garamond", "Times New Roman", Georgia, serif;
  --font-mono:        "JetBrains Mono", "Cascadia Code", "Source Code Pro", Consolas, monospace;

  --w-max: 1180px;
}

/* ── 重置 ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-cn);
  color: var(--text-cast);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* 全局：青铜深底 + 一道极淡斜向高光带，暗示整面青铜在光下 */
  background:
    linear-gradient(115deg,
      transparent 40%,
      rgba(176,134,66,0.04) 50%,
      transparent 60%),
    var(--bronze-deep);
  background-attachment: fixed;
  overflow-x: hidden;
}

a { color: var(--bronze-highlight); text-decoration: none; transition: color .25s; }
a:hover { color: var(--patina-bright); }
.mono { font-family: var(--font-mono); }

/* ── 青铜面（锈色斑驳）── */
.bronze-surface {
  position: relative;
  background:
    /* 顶光斜射高光，暗示金属反光 */
    linear-gradient(135deg,
      rgba(212,168,90,0.16) 0%,
      transparent 22%,
      transparent 68%,
      rgba(14,12,10,0.45) 100%),
    /* 铜绿锈斑（radial 叠加，移动端 fallback 兼具） */
    radial-gradient(circle at 12% 18%, rgba(61,107,90,0.55) 0%, transparent 9%),
    radial-gradient(circle at 82% 28%, rgba(31,61,51,0.6) 0%, transparent 13%),
    radial-gradient(circle at 48% 76%, rgba(74,138,115,0.4) 0%, transparent 7%),
    radial-gradient(circle at 90% 88%, rgba(61,107,90,0.5) 0%, transparent 11%),
    radial-gradient(circle at 25% 55%, rgba(31,61,51,0.35) 0%, transparent 8%),
    /* 器身主色 */
    radial-gradient(ellipse at 30% 20%,
      var(--bronze-mid) 0%,
      var(--bronze-base) 55%,
      var(--bronze-dark) 100%);
}

/* 深色 band（暗器，更沉） */
.band-dark {
  background:
    linear-gradient(135deg,
      rgba(212,168,90,0.08) 0%,
      transparent 25%,
      transparent 70%,
      rgba(0,0,0,0.5) 100%),
    radial-gradient(circle at 70% 30%, rgba(61,107,90,0.3) 0%, transparent 14%),
    radial-gradient(circle at 20% 70%, rgba(31,61,51,0.4) 0%, transparent 12%),
    radial-gradient(ellipse at 50% 50%,
      var(--bronze-dark) 0%, var(--bronze-deep) 100%);
}

/* ── 铸边铭框 ── */
.bronze-frame {
  border: 1.5px solid var(--bronze-gold);
  border-radius: 3px;
  box-shadow:
    0 0 0 1px rgba(14,12,10,0.8),
    inset 0 0 0 1px rgba(212,168,90,0.22),
    inset 0 2px 10px rgba(14,12,10,0.55),
    0 4px 18px rgba(0,0,0,0.45);
  background:
    linear-gradient(160deg,
      rgba(61,53,43,0.6) 0%,
      rgba(43,38,32,0.7) 50%,
      rgba(26,23,20,0.8) 100%);
  position: relative;
}

/* ── 阳文铸字（凸起，金文最经典）── */
.cast-relief, .title-cast, .density-cast, .strip-zh, .ming-zh, .bone-glyph, .band-zh, .footer-zh, .epigraph-text, .plaque-cn {
  color: var(--text-cast);
  text-shadow:
    0 1px 0 rgba(14,12,10,0.7),
    0 2px 1px rgba(14,12,10,0.5),
    0 -1px 0 rgba(212,168,90,0.4),
    0 0 3px rgba(176,134,66,0.28);
}

/* ── 竖排 ── */
.vline {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-cn-display);
  letter-spacing: 0.15em;
}

/* ════════════ 铭首 hero ════════════ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 4rem 2rem;
  overflow: hidden;
}
.hero-glow {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 60% 50% at 28% 32%,
    rgba(212,168,90,0.10) 0%, transparent 60%);
}
.hero-inner {
  position: relative;
  width: 100%; max-width: var(--w-max); margin: 0 auto;
  display: grid;
  grid-template-columns: 0.42fr 1fr;
  gap: 3.5rem;
  align-items: center;
}
/* 左：竖排铸题 */
.hero-left {
  display: flex; flex-direction: row-reverse; align-items: center;
  gap: 1.2rem;
  justify-content: center;
}
.tagline-top, .tagline-bot {
  font-size: clamp(1.1rem, 2.2vw, 1.6rem);
  color: var(--text-soft);
  text-shadow: 0 1px 0 rgba(14,12,10,0.6);
}
.title-cast {
  font-size: clamp(7rem, 16vw, 13rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
}
.hero-note {
  font-size: clamp(0.85rem, 1.4vw, 1.05rem);
  color: var(--text-dim);
  letter-spacing: 0.2em;
}
/* 右：横向铭板 + 引 + 安装 */
.hero-right { display: flex; flex-direction: column; gap: 1.6rem; }
.plaque {
  display: inline-flex; flex-direction: column; align-items: flex-start;
  padding: 1rem 1.8rem;
}
.plaque-hero { align-self: flex-start; }
.plaque-en {
  font-family: var(--font-en-display);
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--bronze-highlight);
  line-height: 1;
  text-shadow: 0 2px 0 rgba(14,12,10,0.6), 0 -1px 0 rgba(212,168,90,0.3);
}
.plaque-cn {
  font-family: var(--font-cn-display);
  font-size: clamp(1rem, 2vw, 1.25rem);
  margin-top: 0.4rem;
  letter-spacing: 0.18em;
}
.hero-lead {
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  color: var(--text-cast);
  line-height: 1.9;
  max-width: 38em;
}
.hero-lead .mono { color: var(--bronze-highlight); font-size: 0.92em; }
.hero-install {
  display: flex; align-items: stretch; gap: 0; max-width: 38em;
  border-radius: 3px; overflow: hidden;
  box-shadow: 0 4px 18px rgba(0,0,0,0.45);
}
.install-label {
  display: flex; align-items: center; justify-content: center;
  width: 2.6rem;
  font-family: var(--font-cn-display); font-size: 1.3rem;
  color: var(--bronze-highlight);
  background: linear-gradient(180deg, var(--bronze-dark), var(--bronze-deep));
  border: 1.5px solid var(--bronze-gold); border-right: none;
  text-shadow: 0 -1px 0 rgba(212,168,90,0.3), 0 1px 0 rgba(0,0,0,0.6);
}
.install-code {
  flex: 1;
  font-family: var(--font-mono);
  font-size: clamp(0.78rem, 1.5vw, 0.9rem);
  color: var(--text-cast);
  background: rgba(14,12,10,0.7);
  border: 1.5px solid var(--bronze-gold);
  padding: 0.9rem 1.1rem;
  white-space: pre; overflow-x: auto;
  line-height: 1.7;
}
.install-code code { font-family: inherit; }
.hero-sister {
  font-size: clamp(0.9rem, 1.5vw, 1rem);
  color: var(--text-soft);
  line-height: 1.85;
  max-width: 38em;
  padding-top: 0.4rem;
  border-top: 1px solid rgba(176,134,66,0.25);
}
.hero-seal {
  position: absolute;
  bottom: 2.5rem; right: 3rem;
  opacity: 0.78;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.5));
}

/* ════════════ band 通用 ════════════ */
.band {
  padding: 5.5rem 2rem;
  border-top: 1px solid rgba(176,134,66,0.18);
}
.band-inner {
  max-width: var(--w-max); margin: 0 auto;
  display: flex; flex-direction: column; gap: 2.2rem;
}
.band-head {
  display: flex; align-items: baseline; gap: 1.2rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid rgba(176,134,66,0.3);
}
.band-zh {
  font-family: var(--font-cn-display);
  font-size: clamp(2.4rem, 5vw, 3.2rem);
  font-weight: 900;
  line-height: 1;
}
.band-en {
  font-family: var(--font-en-display);
  font-size: clamp(0.85rem, 1.4vw, 1.05rem);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.band-lead {
  font-size: clamp(1rem, 1.7vw, 1.18rem);
  color: var(--text-soft);
  max-width: 40em;
  line-height: 1.9;
}

/* ════════════ 骨 · bone-grid ════════════ */
.bone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.6rem;
}
.bone-card {
  padding: 1.8rem 1.5rem;
  display: flex; flex-direction: column; gap: 0.5rem;
}
.bone-glyph {
  font-family: var(--font-cn-display);
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  font-weight: 900;
  letter-spacing: 0.08em;
}
.bone-en {
  font-family: var(--font-en-display);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.bone-desc {
  font-size: 0.98rem;
  color: var(--text-soft);
  line-height: 1.8;
  margin-top: 0.6rem;
}

/* ════════════ 密 · density-pair ════════════ */
.density-pair {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: stretch;
}
.density-side {
  padding: 1.8rem 1.6rem;
  display: flex; flex-direction: column; gap: 1rem;
}
.density-baihua {
  background: rgba(14,12,10,0.5);
  border: 1.5px solid rgba(176,134,66,0.4);
  border-radius: 3px;
}
.density-label {
  font-family: var(--font-en-display);
  font-size: 0.85rem; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--text-dim);
}
.density-text {
  font-size: 1.02rem; line-height: 1.95;
  color: var(--text-soft);
  flex: 1;
}
.density-cast {
  font-family: var(--font-cn-display);
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  color: var(--text-cast);
  letter-spacing: 0.08em;
  line-height: 2.1;
}
.density-stat { align-self: flex-end; display: flex; align-items: baseline; gap: 0.3rem; }
.stat-num {
  font-family: var(--font-en-display); font-weight: 900;
  font-size: clamp(2rem, 4vw, 2.6rem);
  color: var(--bronze-highlight);
  text-shadow: 0 2px 0 rgba(14,12,10,0.6);
}
.stat-unit { font-size: 0.9rem; color: var(--text-dim); }
.density-arrow {
  align-self: center;
  font-family: var(--font-cn-display); font-size: 2rem; font-weight: 900;
  color: var(--bronze-gold);
  text-shadow: 0 2px 0 rgba(14,12,10,0.6), 0 -1px 0 rgba(212,168,90,0.3);
  animation: forge 3s ease-in-out infinite;
}
@keyframes forge {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.08); }
}
.epigraph {
  margin-top: 1.5rem;
  padding: 1.4rem 2rem;
  text-align: center;
}
.epigraph-text {
  font-family: var(--font-cn-display);
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 900;
  letter-spacing: 0.15em;
}
.epigraph-src {
  margin-top: 0.6rem;
  font-size: 0.88rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

/* ════════════ 状态词 · strips（竖排错落铭片） ════════════ */
.strips {
  display: flex; flex-wrap: wrap; gap: 0.9rem;
  justify-content: center;
}
.strip {
  width: 96px;
  min-height: 200px;
  display: flex; flex-direction: column; align-items: center;
  justify-content: space-between;
  padding: 1.4rem 0.5rem 1rem;
  writing-mode: vertical-rl;
  text-orientation: upright;
}
.strip-zh {
  font-family: var(--font-cn-display);
  font-size: 2.4rem; font-weight: 900;
  letter-spacing: 0;
}
.strip-en {
  writing-mode: horizontal-tb;
  text-orientation: mixed;
  font-family: var(--font-en-display);
  font-size: 0.68rem; letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: auto;
}
/* 错落：仿简牍参差 */
.strip:nth-child(3n)   { margin-top: 1.6rem; }
.strip:nth-child(4n+1) { margin-top: 0.8rem; }
.strip:nth-child(5n+3) { margin-top: 2.2rem; }

/* ════════════ 铭 · ming-grid ════════════ */
.ming-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.4rem;
}
.ming-card {
  padding: 1.8rem 1.5rem;
  display: flex; flex-direction: column; gap: 0.8rem;
  text-align: center;
}
.ming-zh {
  font-family: var(--font-cn-display);
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  font-weight: 900;
  letter-spacing: 0.12em;
  line-height: 1.5;
}
.ming-when {
  font-size: 0.85rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

/* ════════════ 防 · guard-list ════════════ */
.guard-list { display: flex; flex-direction: column; gap: 1.2rem; }
.guard-item {
  display: flex; align-items: stretch; gap: 1.2rem;
  padding: 1.3rem 1.5rem;
}
.guard-num {
  flex: 0 0 auto;
  display: flex; align-items: center; justify-content: center;
  width: 3rem;
  font-family: var(--font-cn-display); font-size: 1.8rem; font-weight: 900;
  color: var(--bronze-highlight);
  border-right: 1px solid rgba(176,134,66,0.35);
  text-shadow: 0 2px 0 rgba(14,12,10,0.6);
}
.guard-body { display: flex; flex-direction: column; gap: 0.35rem; }
.guard-title {
  font-family: var(--font-cn-display);
  font-size: 1.15rem; font-weight: 700;
  color: var(--text-cast);
  letter-spacing: 0.08em;
}
.guard-desc { font-size: 0.98rem; color: var(--text-soft); line-height: 1.8; }

/* ════════════ 叶脚 footer ════════════ */
.footer {
  padding: 3.5rem 2rem 2.5rem;
  border-top: 1px solid rgba(176,134,66,0.25);
  position: relative;
}
.footer-inner {
  max-width: var(--w-max); margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: 2rem;
  align-items: center; justify-content: space-between;
}
.footer-plaque { padding: 1.2rem 1.8rem; text-align: center; }
.footer-zh {
  font-family: var(--font-cn-display);
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  font-weight: 900; letter-spacing: 0.15em;
}
.footer-src { font-size: 0.8rem; color: var(--text-dim); margin-top: 0.4rem; }
.footer-meta {
  display: flex; flex-direction: column; gap: 0.4rem;
  font-size: 0.9rem; color: var(--text-soft);
  text-align: right;
}
.footer-meta .mono { color: var(--bronze-highlight); }
.back-top {
  display: inline-block; margin-top: 2rem;
  font-family: var(--font-cn-display);
  font-size: 0.95rem; color: var(--text-dim);
  letter-spacing: 0.1em;
}
.back-top:hover { color: var(--bronze-highlight); }

/* ════════════ 滚动揭示（渐进增强：默认可见，JS 加 .reveal-init 才隐藏） ════════════ */
.reveal-init .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .8s ease, transform .8s ease;
}
.reveal-init .reveal.is-in { opacity: 1; transform: none; }

/* ════════════ 响应式 ════════════ */
@media (max-width: 860px) {
  .hero { min-height: auto; padding: 3.5rem 1.2rem; }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2.2rem;
  }
  .hero-left { flex-direction: row; justify-content: center; gap: 1rem; }
  .tagline-top, .tagline-bot { font-size: 1rem; }
  .title-cast { font-size: 6rem; }
  .hero-note { display: none; }
  .hero-seal { width: 48px; height: 48px; bottom: 1.5rem; right: 1.2rem; }

  .band { padding: 3.8rem 1.2rem; }
  .band-head { gap: 0.8rem; }

  .density-pair {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .density-arrow { transform: rotate(90deg); margin: 0 auto; }

  .footer-inner { flex-direction: column; text-align: center; }
  .footer-meta { text-align: center; align-items: center; }
}

@media (max-width: 480px) {
  .title-cast { font-size: 4.5rem; }
  .strip { width: 78px; min-height: 160px; }
  .strip-zh { font-size: 1.9rem; }
  .install-label { width: 2.2rem; font-size: 1.1rem; }
  .hero-install { flex-direction: column; }
  .install-label { width: 100%; padding: 0.5rem; border-right: 1.5px solid var(--bronze-gold); border-bottom: none; }
}

/* ════════════ 降级：prefers-reduced-motion ════════════ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .density-arrow { animation: none; }
  .reveal-init .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}