/* 词根词典 · 站点样式（独立视觉体系：墨绿 + 纸感） */

/* 自托管语言学字体（子集：拉丁 / IPA / 希腊字形；中文回退系统字体） */
@font-face {
  font-family: "Gentium Plus";
  src: url("/fonts/gentium-plus.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #f7f7f3;
  --bg-soft: #eeefe8;
  --card: #fdfdfb;
  --ink: #26282a;
  --ink-soft: #666b66;
  --ink-faint: #979c94;
  --accent: #2f6b4f;
  --accent-ink: #235540;
  --accent-soft: #dce8df;
  --gold: #a0641c;
  --rule: #e2e3da;
  --rule-strong: #cfd2c6;
  --serif: "Gentium Plus", Georgia, "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", "Times New Roman", serif;
  --glyph: "Gentium Plus", "Charis SIL", "Doulos SIL", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", "Cascadia Code", Consolas, "Courier New", monospace;
  --measure: 46rem;
}

html[data-theme="dark"] {
  --bg: #15181a;
  --bg-soft: #1d2123;
  --card: #1e2224;
  --ink: #e3e6e2;
  --ink-soft: #a2a8a1;
  --ink-faint: #6c726b;
  --accent: #7fb99d;
  --accent-ink: #96c8ae;
  --accent-soft: #24322b;
  --gold: #d09a53;
  --rule: #2c3234;
  --rule-strong: #3d4446;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 16.5px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  max-width: 74rem; margin: 0 auto; padding: 0.55rem 1.25rem;
  display: flex; align-items: center; gap: 1.4rem;
  font-family: var(--sans); font-size: 0.85rem;
}
.nav-brand { font-weight: 600; letter-spacing: 0.05em; color: var(--ink); text-decoration: none; white-space: nowrap; }
.nav-brand .star { color: var(--accent); }
.nav-links { display: flex; gap: 1.1rem; flex: 1; overflow-x: auto; }
.nav-links a { color: var(--ink-soft); text-decoration: none; white-space: nowrap; padding: 0.2rem 0; }
.nav-links a:hover, .nav-links a.on { color: var(--accent-ink); }
.icon-btn {
  border: 1px solid var(--rule-strong); background: transparent; color: var(--ink-soft);
  border-radius: 6px; font-family: var(--sans); font-size: 0.78rem;
  padding: 0.28rem 0.6rem; cursor: pointer; line-height: 1.4;
}
.icon-btn:hover { color: var(--accent-ink); border-color: var(--accent); }

/* ---------- 通用 ---------- */
.wrap { max-width: 74rem; margin: 0 auto; padding: 0 1.25rem; }
.reading { max-width: var(--measure); margin: 0 auto; }

/* ---------- 首页 ---------- */
.hero { padding: 4rem 0 2.6rem; border-bottom: 1px solid var(--rule); }
.hero-kicker { font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.28em; color: var(--accent); text-transform: uppercase; }
.hero h1 { font-size: clamp(2.1rem, 5.5vw, 3.4rem); line-height: 1.2; margin: 0.9rem 0 0.4rem; font-weight: 600; letter-spacing: 0.03em; }
.hero .lead { max-width: 40rem; color: var(--ink-soft); font-size: 1.02rem; margin-top: 1rem; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; margin-top: 1.4rem; font-family: var(--sans); font-size: 0.82rem; color: var(--ink-faint); }
.hero-meta b { color: var(--accent-ink); font-weight: 600; }
.hero-nota { margin-top: 0.65rem; font-family: var(--sans); font-size: 0.78rem; }
.hero-nota a { color: var(--accent-ink); text-decoration: none; }
.hero-nota a:hover { text-decoration: underline; }

/* 搜索框 */
.search-box { margin-top: 1.8rem; max-width: 26rem; }
.search-box input {
  width: 100%; padding: 0.7rem 1rem; font-size: 1rem;
  font-family: var(--sans);
  background: var(--card); color: var(--ink);
  border: 1px solid var(--rule-strong); border-radius: 10px;
  outline: none;
}
.search-box input:focus { border-color: var(--accent); }
.search-hint { font-family: var(--sans); font-size: 0.78rem; color: var(--ink-faint); margin-top: 0.45rem; }

/* 词根网格 */
.section { padding: 2.4rem 0 3rem; }
.section h2 { font-size: 1.25rem; letter-spacing: 0.06em; margin: 0 0 0.4rem; }
.section .count { font-family: var(--sans); font-size: 0.82rem; color: var(--ink-faint); margin-bottom: 1.2rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: 0.9rem; }
.root-card {
  display: block; text-decoration: none; color: var(--ink);
  background: var(--card); border: 1px solid var(--rule); border-radius: 12px;
  padding: 1rem 1.1rem 0.9rem; transition: border-color 0.15s, transform 0.15s;
}
.root-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.root-card .rc-form { font-family: var(--glyph); font-size: 1.24rem; color: var(--accent-ink); letter-spacing: 0.01em; }
.root-card .rc-form .ast { color: var(--gold); }
.root-card .rc-gloss { font-family: var(--sans); font-size: 0.82rem; color: var(--ink-soft); margin-top: 0.25rem; line-height: 1.6; }
.root-card .rc-count { font-family: var(--sans); font-size: 0.75rem; color: var(--ink-faint); margin-top: 0.5rem; }

/* ---------- 词根详情页 ---------- */
.root-hero { padding: 3rem 0 1.6rem; border-bottom: 1px solid var(--rule); }
.root-hero .crumb { font-family: var(--sans); font-size: 0.8rem; color: var(--ink-faint); margin-bottom: 0.9rem; }
.root-hero .crumb a { color: var(--ink-soft); text-decoration: none; }
.root-hero .crumb a:hover { color: var(--accent-ink); }
.root-hero .form-row { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.root-hero .form { font-family: var(--glyph); font-size: clamp(2rem, 5vw, 2.9rem); color: var(--ink); letter-spacing: 0.01em; }
.root-hero .form .ast { color: var(--gold); }
.root-hero .gloss { font-size: 1.12rem; color: var(--accent-ink); margin-top: 0.5rem; }
.root-hero .story { max-width: 42rem; color: var(--ink-soft); font-size: 0.98rem; margin-top: 1rem; line-height: 1.9; }
.root-hero .story + .story { margin-top: 0.7rem; }
.nota-btn {
  font-family: var(--sans); font-size: 0.76rem; color: var(--ink-soft);
  border: 1px solid var(--rule-strong); background: transparent;
  border-radius: 999px; padding: 0.26rem 0.8rem; cursor: pointer;
}
.nota-btn:hover { color: var(--accent-ink); border-color: var(--accent); }

/* 演化链 */
.chain-note { font-family: var(--sans); font-size: 0.8rem; color: var(--ink-faint); margin: 2rem 0 0.8rem; }

/* 完整词表（fallback 逗号流） */
.wordlist { font-family: var(--sans); font-size: 0.86rem; color: var(--ink-soft); line-height: 2.1; margin-top: 0.8rem; }
.wordlist span { color: var(--ink-faint); padding: 0 0.15rem; }

/* ---------- 符号说明浮窗 ---------- */
.nota-pop {
  border: 1px solid var(--rule-strong); border-radius: 14px;
  background: var(--card); color: var(--ink);
  padding: 1.05rem 1.2rem 1.1rem;
  width: min(92vw, 26.5rem);
  max-height: 82vh; overflow: auto;
  box-shadow: 0 14px 44px rgba(0, 0, 0, 0.18);
}
.nota-pop::backdrop { background: rgba(18, 22, 20, 0.38); }
.nota-title { font-family: var(--sans); font-weight: 600; font-size: 0.9rem; margin-bottom: 0.55rem; }
.nota-list { margin: 0; }
.nota-row { display: grid; grid-template-columns: 5.6rem 1fr; gap: 0.65rem; padding: 0.42rem 0; border-bottom: 1px solid var(--rule); }
.nota-row:last-child { border-bottom: 0; }
.nota-row dt { font-family: var(--glyph); font-size: 0.98rem; color: var(--accent-ink); }
.nota-row dd { margin: 0; font-size: 0.84rem; line-height: 1.65; color: var(--ink-soft); }
.nota-more { display: inline-block; margin-top: 0.75rem; font-family: var(--sans); font-size: 0.8rem; color: var(--accent-ink); text-decoration: none; }
.nota-more:hover { text-decoration: underline; }

/* 关于页符号表 */
.nota-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; margin: 0.9rem 0 0.4rem; }
.nota-table th, .nota-table td { text-align: left; padding: 0.5rem 0.7rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
.nota-table th { font-family: var(--sans); font-size: 0.76rem; color: var(--ink-faint); font-weight: 500; }
.nota-table td.sym { font-family: var(--glyph); font-size: 1rem; color: var(--accent-ink); white-space: nowrap; }
.nota-table td.nm { font-family: var(--sans); font-size: 0.82rem; color: var(--ink-soft); white-space: nowrap; }

/* ---------- 演变历程（横向树状） ---------- */
.evo { margin-top: 1.6rem; border: 1px solid var(--rule-strong); border-radius: 14px; background: var(--card); padding: 1.05rem 1.25rem 1.15rem; }
.evo-title { font-family: var(--sans); font-size: 0.78rem; letter-spacing: 0.18em; color: var(--ink-faint); margin-bottom: 0.95rem; }
.evo-sub { letter-spacing: 0; margin-left: 0.65rem; color: var(--ink-faint); font-size: 0.74rem; }
.evo-body { display: flex; align-items: center; }
.evo-root { display: flex; flex-direction: column; gap: 0.1rem; padding: 0.55rem 1rem; background: var(--accent-soft); border-radius: 10px; min-width: 7.5rem; flex-shrink: 0; }
.evo-root .evo-form { font-family: var(--glyph); font-size: 1.06rem; color: var(--accent-ink); }
.evo-root .evo-form .ast { color: var(--gold); }
.evo-root .evo-gloss { font-family: var(--sans); font-size: 0.76rem; color: var(--ink-soft); }
.evo-branches { flex: 1; min-width: 0; margin-left: 2.2rem; position: relative; display: flex; flex-direction: column; }
.evo-branches::before { content: ""; position: absolute; left: -2.2rem; top: 50%; width: 2.2rem; border-top: 1.5px solid var(--rule-strong); }
.evo-b { position: relative; padding: 0.44rem 0 0.44rem 1.8rem; display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.3rem 0.85rem; }
.evo-b::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; border-left: 1.5px solid var(--rule-strong); }
.evo-b:first-child::before { top: 50%; }
.evo-b:last-child::before { bottom: 50%; }
.evo-b::after { content: ""; position: absolute; left: 0; top: 50%; width: 1.25rem; border-top: 1.5px solid var(--rule-strong); }
.evo-lang {
  font-family: var(--sans); font-size: 0.8rem; color: var(--accent-ink);
  background: var(--accent-soft); border-radius: 999px; padding: 0.15rem 0.7rem;
  text-decoration: none; white-space: nowrap;
}
.evo-lang:hover { text-decoration: underline; }
.evo-lang b { font-weight: 600; }
.evo-chain { font-family: var(--glyph); font-size: 0.79rem; color: var(--ink-soft); }
.evo-words { font-family: var(--sans); font-size: 0.78rem; color: var(--ink-faint); }

/* ---------- 单词表 ---------- */
.words-head { margin-top: 2.2rem; padding-bottom: 0.95rem; border-bottom: 1px solid var(--rule); }
.words-title { font-size: 1.05rem; font-weight: 600; color: var(--ink); display: flex; align-items: baseline; gap: 0.7rem; flex-wrap: wrap; }
.words-title .wt-count { font-family: var(--sans); font-size: 0.78rem; font-weight: 400; color: var(--ink-faint); }
.words-tools { display: flex; align-items: center; gap: 0.6rem; margin-top: 0.75rem; flex-wrap: wrap; }
#word-filter {
  flex: 1; min-width: 11rem; max-width: 22rem;
  padding: 0.48rem 0.85rem; font-size: 0.9rem; font-family: var(--sans);
  background: var(--card); color: var(--ink);
  border: 1px solid var(--rule-strong); border-radius: 9px; outline: none;
}
#word-filter:focus { border-color: var(--accent); }
.seg { display: inline-flex; border: 1px solid var(--rule-strong); border-radius: 9px; overflow: hidden; }
.seg button {
  font-family: var(--sans); font-size: 0.8rem; padding: 0.42rem 1rem;
  background: transparent; color: var(--ink-soft); border: 0; cursor: pointer;
}
.seg button + button { border-left: 1px solid var(--rule-strong); }
.seg button.on { background: var(--accent); color: var(--bg); }
.words-hint { font-family: var(--sans); font-size: 0.76rem; color: var(--ink-faint); margin-top: 0.55rem; }
#word-empty { padding: 2.4rem 0; text-align: center; color: var(--ink-faint); font-family: var(--sans); font-size: 0.85rem; }

.branch { margin-top: 1.5rem; scroll-margin-top: 4.6rem; }
.branch-head { font-size: 1.02rem; margin: 0 0 0.35rem; display: flex; align-items: baseline; gap: 0.6rem; flex-wrap: wrap; }
.branch-lang { color: var(--ink); font-weight: 600; }
.branch-lang::before { content: "▍"; color: var(--accent); margin-right: 0.35rem; }
.branch-chain { font-family: var(--glyph); font-size: 0.77rem; color: var(--ink-faint); word-break: break-all; }
.branch-count { margin-left: auto; font-family: var(--sans); font-size: 0.78rem; color: var(--ink-faint); }
.word-list { list-style: none; margin: 0; padding: 0; }

.w-term { color: var(--ink); font-weight: 600; font-size: 0.95rem; }
.w-ph { font-family: var(--glyph); font-size: 0.75rem; color: var(--ink-faint); }
.w-zh { color: var(--ink-soft); font-size: 0.88rem; line-height: 1.7; }
.w-src { font-family: var(--sans); font-size: 0.74rem; color: var(--ink-faint); }
summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* 浏览模式：紧凑词条流，点开看释义 */
.word-sections[data-view="browse"] .word-list { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 0.45rem; margin-top: 0.65rem; }
.word-sections[data-view="browse"] details { display: inline-block; }
.word-sections[data-view="browse"] summary {
  list-style: none; cursor: pointer;
  display: inline-flex; align-items: baseline; gap: 0.45rem;
  background: var(--card); border: 1px solid var(--rule-strong);
  border-radius: 999px; padding: 0.26rem 0.9rem;
}
.word-sections[data-view="browse"] summary::-webkit-details-marker { display: none; }
.word-sections[data-view="browse"] details[open] summary { border-color: var(--accent); background: var(--accent-soft); }
.word-sections[data-view="browse"] details[open] summary .w-term { color: var(--accent-ink); }
.word-sections[data-view="browse"] .w-detail { display: none; }
.word-sections[data-view="browse"] details[open] .w-detail {
  display: block; margin-top: 0.55rem; max-width: 42rem;
  padding: 0.65rem 0.9rem; background: var(--bg-soft);
  border: 1px solid var(--rule); border-radius: 10px;
}

/* 详细模式：完整列表 */
.word-sections[data-view="detail"] details {
  display: grid; grid-template-columns: minmax(9rem, 11.5rem) 1fr;
  gap: 0.15rem 1.1rem; padding: 0.5rem 0; border-bottom: 1px solid var(--rule);
}
.word-sections[data-view="detail"] .w-item:last-child details { border-bottom: 0; }
.word-sections[data-view="detail"] summary { list-style: none; display: flex; align-items: baseline; gap: 0.5rem; flex-wrap: wrap; cursor: default; pointer-events: none; }
.word-sections[data-view="detail"] summary::-webkit-details-marker { display: none; }
.word-sections[data-view="detail"] .w-detail { display: flex; flex-direction: column; gap: 0.1rem; min-width: 0; }

/* 相关词根 */
.related { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.6rem; }
.related a {
  font-family: var(--sans); font-size: 0.82rem; color: var(--accent-ink);
  text-decoration: none; border: 1px solid var(--rule-strong); border-radius: 999px;
  padding: 0.25rem 0.8rem;
}
.related a:hover { border-color: var(--accent); }
.rf { font-family: var(--glyph); }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--rule); margin-top: 3rem; padding: 2rem 0 3rem; font-family: var(--sans); font-size: 0.8rem; color: var(--ink-faint); }
.footer .cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 1.4rem; }
.footer h4 { margin: 0 0 0.5rem; font-size: 0.8rem; letter-spacing: 0.12em; color: var(--ink-soft); text-transform: uppercase; }
.footer p { margin: 0 0 0.35rem; line-height: 1.7; }
.footer a { color: var(--ink-soft); }

/* 搜索结果高亮 */
mark { background: var(--accent-soft); color: var(--accent-ink); border-radius: 3px; padding: 0 2px; }
.hidden { display: none !important; }
#notation { scroll-margin-top: 4.6rem; }

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .root-card .rc-form { font-size: 1.12rem; }
  .evo-body { flex-direction: column; align-items: stretch; gap: 0.85rem; }
  .evo-branches { margin-left: 0.7rem; }
  .evo-branches::before { display: none; }
  .word-sections[data-view="detail"] details { grid-template-columns: 1fr; gap: 0.15rem; }
  .nota-row { grid-template-columns: 4.2rem 1fr; }
}