/* ==========================================================
   字源 · 汉字演变图谱 (968898.cn)
   ink.css — 宣纸 / 墨 / 朱砂
   ========================================================== */

:root {
  --paper: #f5efe3;
  --paper-2: #ece3d2;
  --ink: #1b1a17;
  --ink-2: #3d3a33;
  --ink-dim: #6f695c;
  --line: rgba(27, 26, 23, 0.14);
  --cinnabar: #b23a2f;
  --cinnabar-soft: rgba(178, 58, 47, 0.10);
  --jade: #3f6b58;
  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", serif;
  --font-kai: "Kaiti SC", "STKaiti", "KaiTi", serif;
  --font-sans: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --maxw: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-serif);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 宣纸纹理 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .55;
  background-image:
    radial-gradient(circle at 20% 18%, rgba(178, 58, 47, .045), transparent 42%),
    radial-gradient(circle at 82% 74%, rgba(63, 107, 88, .05), transparent 46%),
    repeating-linear-gradient(0deg, rgba(27,26,23,.016) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(90deg, rgba(27,26,23,.014) 0 1px, transparent 1px 4px);
}

#ink-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: .85;
}

.page { position: relative; z-index: 1; }

.wrap { width: min(var(--maxw), calc(100% - 48px)); margin: 0 auto; }

/* ---------------- 导航 ---------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(245, 239, 227, .82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 26px; height: 66px; }

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: .22em;
  font-size: 16px;
}
.seal {
  display: inline-grid;
  place-items: center;
  width: 30px; height: 30px;
  background: var(--cinnabar);
  color: #fdf7ec;
  border-radius: 4px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0;
  box-shadow: 0 2px 0 rgba(0,0,0,.08);
}

.nav-links { margin-left: auto; display: flex; gap: 2px; flex-wrap: wrap; }
.nav-links a {
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 14px;
  padding: 7px 13px;
  border-radius: 3px;
  transition: color .25s, background .25s;
  font-family: var(--font-sans);
}
.nav-links a:hover { color: var(--ink); background: rgba(27,26,23,.05); }
.nav-links a[aria-current="page"] { color: var(--cinnabar); }

/* ---------------- 排版 ---------------- */
section { padding: 76px 0; }

.kicker {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: .38em;
  color: var(--cinnabar);
  text-transform: uppercase;
  margin-bottom: 14px;
}

h1, h2, h3 { font-weight: 700; line-height: 1.3; margin: 0 0 16px; letter-spacing: .02em; }
h1 { font-size: clamp(38px, 6vw, 76px); }
h2 { font-size: clamp(24px, 3.2vw, 38px); }
h3 { font-size: 19px; }

p { color: var(--ink-2); margin: 0 0 15px; }
.lede { font-size: clamp(15px, 1.5vw, 18px); color: var(--ink-dim); max-width: 60ch; }

.vertical {
  writing-mode: vertical-rl;
  text-orientation: upright;
  letter-spacing: .34em;
}

/* ---------------- Hero ---------------- */
.hero {
  min-height: calc(100vh - 66px);
  display: grid;
  align-items: center;
  padding: 40px 0 70px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 46px;
  align-items: center;
}

.hero-title { font-size: clamp(52px, 9vw, 118px); line-height: 1; letter-spacing: .06em; margin-bottom: 20px; }
.hero-title .sub {
  display: block;
  margin-top: 18px;
  font-family: var(--font-sans);
  font-size: clamp(13px, 1.3vw, 15px);
  letter-spacing: .52em;
  color: var(--ink-dim);
  font-weight: 400;
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  font-size: 15px;
  font-family: var(--font-sans);
  text-decoration: none;
  border-radius: 3px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  transition: transform .3s, background .25s, color .25s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-2px); background: #000; }
.btn.line { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.line:hover { border-color: var(--ink); background: transparent; }
.btn.red { background: var(--cinnabar); border-color: var(--cinnabar); color: #fdf7ec; }

/* 每日一字展示块 */
.daily {
  border: 1px solid var(--line);
  background: rgba(252, 248, 240, .7);
  padding: 26px;
  position: relative;
}
.daily::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(178, 58, 47, .18);
  pointer-events: none;
}
.daily-char {
  font-size: 132px;
  line-height: 1.05;
  text-align: center;
  margin: 6px 0 10px;
  font-family: var(--font-kai);
  color: var(--ink);
  text-shadow: 0 2px 0 rgba(0,0,0,.05);
}
.daily-meta { text-align: center; font-family: var(--font-sans); font-size: 12px; letter-spacing: .2em; color: var(--ink-dim); }
.daily-desc { font-size: 14px; color: var(--ink-2); margin: 14px 0 0; min-height: 76px; }
.daily-head { display: flex; justify-content: space-between; font-family: var(--font-sans); font-size: 11px; letter-spacing: .24em; color: var(--cinnabar); }

/* ---------------- 数字条 ---------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stat { padding: 26px 18px; text-align: center; border-right: 1px solid var(--line); }
.stat:last-child { border-right: none; }
.stat b { display: block; font-size: clamp(24px, 3vw, 36px); font-weight: 700; font-variant-numeric: tabular-nums; }
.stat span { font-family: var(--font-sans); font-size: 12px; letter-spacing: .2em; color: var(--ink-dim); }

/* ---------------- 检索 ---------------- */
.search-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  padding: 18px 0 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}
.search-input {
  flex: 1 1 240px;
  padding: 12px 16px;
  font-size: 15px;
  font-family: var(--font-serif);
  border: 1px solid var(--line);
  background: rgba(252, 248, 240, .8);
  color: var(--ink);
  border-radius: 3px;
  outline: none;
  transition: border-color .25s;
}
.search-input:focus { border-color: var(--cinnabar); }
.filters { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  padding: 7px 15px;
  font-size: 13px;
  font-family: var(--font-sans);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-dim);
  border-radius: 999px;
  cursor: pointer;
  transition: all .22s;
}
.chip:hover { color: var(--ink); border-color: var(--ink); }
.chip.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ---------------- 字卡 ---------------- */
.char-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(118px, 1fr));
  gap: 12px;
}
.char-card {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  background: rgba(252, 248, 240, .62);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: transform .3s, border-color .3s, background .3s;
  overflow: hidden;
  padding: 0;
  font-family: var(--font-kai);
}
.char-card:hover { transform: translateY(-4px); border-color: rgba(178, 58, 47, .5); background: #fdf9f1; }
.char-card .big { font-size: 46px; color: var(--ink); line-height: 1; }
.char-card .py {
  position: absolute;
  bottom: 8px;
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-dim);
}
.char-card .tag-mini {
  position: absolute;
  top: 8px; left: 8px;
  font-family: var(--font-sans);
  font-size: 9px;
  letter-spacing: .1em;
  color: var(--cinnabar);
  border: 1px solid rgba(178, 58, 47, .3);
  padding: 1px 4px;
  border-radius: 2px;
}

.empty { padding: 60px 0; text-align: center; color: var(--ink-dim); }

/* ---------------- 详情弹层 ---------------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(20, 18, 15, .55);
  backdrop-filter: blur(6px);
}
.modal.open { display: flex; }
.modal-card {
  width: min(720px, 100%);
  max-height: 88vh;
  overflow: auto;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 34px;
  position: relative;
  animation: pop .3s cubic-bezier(.2,.9,.3,1);
}
@keyframes pop { from { opacity: 0; transform: translateY(14px) scale(.98); } }
.modal-close {
  position: absolute;
  top: 12px; right: 12px;
  width: 34px; height: 34px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-dim);
  cursor: pointer;
  font-size: 16px;
  border-radius: 50%;
}
.modal-close:hover { color: var(--cinnabar); border-color: var(--cinnabar); }
.modal-top { display: flex; gap: 26px; align-items: flex-start; }
.modal-char { font-family: var(--font-kai); font-size: 96px; line-height: 1; }
.modal-info { flex: 1; }
.modal-info dl { display: grid; grid-template-columns: 68px 1fr; gap: 6px 12px; margin: 10px 0 0; font-size: 14px; }
.modal-info dt { color: var(--ink-dim); font-family: var(--font-sans); font-size: 12px; letter-spacing: .12em; }
.modal-info dd { margin: 0; }
.stage-badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cinnabar);
  border: 1px solid rgba(178,58,47,.4);
  padding: 2px 8px;
  border-radius: 2px;
}
.modal-body { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line); }
.modal-body h4 { margin: 0 0 8px; font-size: 13px; letter-spacing: .22em; color: var(--cinnabar); font-family: var(--font-sans); }

/* ---------------- 六书 / 文化 ---------------- */
.liushu { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.liushu-item { background: var(--paper); padding: 26px 24px; }
.liushu-item .glyph { font-family: var(--font-kai); font-size: 40px; color: var(--cinnabar); line-height: 1; margin-bottom: 10px; }
.liushu-item p { font-size: 14px; margin: 0; }

.era-list { border-top: 1px solid var(--line); }
.era { display: grid; grid-template-columns: 140px 1fr; gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.era time { font-family: var(--font-sans); font-size: 13px; letter-spacing: .16em; color: var(--cinnabar); }
.era h3 { margin: 0 0 6px; font-size: 18px; }
.era p { margin: 0; font-size: 14px; }

/* ---------------- 页脚 ---------------- */
.footer { border-top: 1px solid var(--line); padding: 40px 0 56px; margin-top: 30px; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; font-family: var(--font-sans); font-size: 12px; color: var(--ink-dim); }
.footer a { color: var(--ink-dim); text-decoration: none; }
.footer a:hover { color: var(--cinnabar); }

/* ---------------- 入场 ---------------- */
.fade {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .8s cubic-bezier(.2,.9,.3,1), transform .8s cubic-bezier(.2,.9,.3,1);
  transition-delay: var(--d, 0ms);
}
.fade.in { opacity: 1; transform: none; }

@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; }
  .daily { max-width: 340px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--line); }
  .era { grid-template-columns: 1fr; gap: 8px; }
}
@media (max-width: 560px) {
  .wrap { width: calc(100% - 32px); }
  section { padding: 56px 0; }
  .char-grid { grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); }
  .modal-card { padding: 24px; }
  .modal-top { gap: 16px; }
  .modal-char { font-size: 68px; }
}