:root {
  --porcelain: #f5f7f3;
  --paper: #ffffff;
  --ink: #172126;
  --ink-soft: #536063;
  --mineral: #2d5c54;
  --mineral-pale: #dfe9e4;
  --seal: #a43d36;
  --rule: #d5ddd8;
  --shadow: 0 18px 50px rgba(22, 42, 39, .08);
  --song: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--porcelain); font-family: var(--sans); }
button, input { font: inherit; }
button { color: inherit; }
button:focus-visible, input:focus-visible { outline: 3px solid rgba(45, 92, 84, .22); outline-offset: 3px; }

.masthead {
  min-height: 76px; padding: 14px clamp(22px, 5vw, 72px); display: flex; align-items: center;
  justify-content: space-between; border-bottom: 1px solid var(--rule); background: rgba(255,255,255,.86);
}
.masthead > p { color: var(--ink-soft); font-size: 13px; letter-spacing: .08em; }
.brand { display: inline-flex; align-items: center; gap: 13px; color: inherit; text-decoration: none; }
.brand strong { display: block; font: 700 19px/1.1 var(--song); letter-spacing: .12em; }
.brand small { display: block; margin-top: 5px; color: var(--ink-soft); font-size: 8px; letter-spacing: .18em; }
.brand-mark { width: 30px; display: grid; gap: 3px; }
.brand-mark i { height: 3px; background: var(--mineral); }
.brand-mark i:nth-child(3), .brand-mark i:nth-child(4) { background: linear-gradient(90deg,var(--mineral) 0 42%,transparent 42% 58%,var(--mineral) 58%); }

main { min-height: calc(100vh - 76px); }
.search-stage {
  min-height: 430px; padding: 72px clamp(22px, 7vw, 110px) 64px; display: grid;
  grid-template-columns: minmax(0,1.25fr) minmax(320px,.75fr); gap: clamp(40px,7vw,110px); align-items: end;
  background: var(--paper); border-bottom: 1px solid var(--rule); position: relative; overflow: hidden;
}
.search-stage::after {
  content: "乾 坤 震 巽 坎 离 艮 兑"; position: absolute; right: -14px; top: 22px;
  writing-mode: vertical-rl; color: rgba(45,92,84,.055); font: 700 58px/1 var(--song); letter-spacing: .15em;
}
.eyebrow { margin: 0 0 13px; color: var(--mineral); font-size: 12px; font-weight: 700; letter-spacing: .16em; }
h1 { max-width: 790px; margin: 0; font: 600 clamp(37px,5vw,68px)/1.16 var(--song); letter-spacing: -.035em; }
h1 em { color: var(--mineral); font-style: normal; }
.intro { max-width: 620px; margin: 24px 0 0; color: var(--ink-soft); font: 17px/1.85 var(--song); }
.search-console { position: relative; z-index: 1; padding: 25px 0 5px; border-top: 3px solid var(--ink); border-bottom: 1px solid var(--rule); }
.search-console label { display: block; margin-bottom: 10px; color: var(--ink-soft); font-size: 12px; letter-spacing: .12em; }
.search-row { display: grid; grid-template-columns: 1fr auto; border-bottom: 1px solid var(--ink); }
.search-row input { min-width: 0; padding: 15px 0; border: 0; background: transparent; color: var(--ink); font-size: 18px; }
.search-row input::placeholder { color: #9aa3a1; }
.search-row button, .quick button, .rail-heading button { border: 0; background: transparent; cursor: pointer; }
.search-row button { padding: 0 3px 0 16px; color: var(--seal); font-size: 13px; }
.quick { display: flex; gap: 7px; flex-wrap: wrap; padding: 14px 0; }
.quick button { padding: 5px 8px; color: var(--ink-soft); font-size: 12px; border-bottom: 1px solid transparent; }
.quick button:hover { color: var(--mineral); border-color: var(--mineral); }

.archive { max-width: 1500px; margin: auto; padding: 56px clamp(22px,5vw,72px) 100px; }
.hexagram-browser { border-top: 2px solid var(--ink); }
.hexagram-heading { display: flex; justify-content: space-between; align-items: end; gap: 24px; padding: 22px 0 19px; }
.hexagram-heading .eyebrow { margin-bottom: 7px; }
.hexagram-heading h2 { margin: 0; font: 600 30px/1.2 var(--song); }
.hexagram-select-bar { display: grid; grid-template-columns: 76px minmax(240px,520px) auto; align-items: stretch; gap: 0; max-width: 720px; border: 1px solid var(--rule); background: var(--paper); }
.selected-hexagram { display: grid; place-items: center; min-height: 86px; border-right: 1px solid var(--rule); background: var(--porcelain); }
.selected-hexagram .mini-hex { width: 38px; gap: 3px; }
.selected-hexagram .mini-hex i { height: 3px; }
.selected-hexagram-placeholder { color: var(--mineral); font: 28px/1 var(--song); }
.hexagram-select-wrap { min-width: 0; padding: 13px 18px 12px; }
.hexagram-select-wrap > span { display: block; margin-bottom: 7px; color: var(--ink-soft); font-size: 11px; letter-spacing: .08em; }
.hexagram-select-wrap select { width: 100%; padding: 0 36px 0 0; border: 0; outline: 0; color: var(--ink); background: transparent; font: 600 18px/1.4 var(--song); cursor: pointer; }
.hexagram-select-wrap:focus-within { box-shadow: inset 0 -2px var(--mineral); }
.hexagram-select-bar > button { align-self: stretch; padding: 0 20px; border: 0; border-left: 1px solid var(--rule); color: var(--seal); background: transparent; cursor: pointer; font-size: 12px; white-space: nowrap; }
.hexagram-select-bar > button:hover { background: #edf2ee; }
.archive-stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 28px; margin: 30px 0 0; }
.archive-stats div { display: flex; align-items: baseline; justify-content: space-between; border-bottom: 1px solid var(--rule); padding-bottom: 11px; }
.archive-stats dt { color: var(--ink-soft); font-size: 12px; }
.archive-stats dd { margin: 0; font: 600 24px/1 var(--song); }
.results-area { max-width: 1180px; margin: 64px auto 0; }
.results-heading { display: flex; justify-content: space-between; align-items: end; padding-bottom: 18px; border-bottom: 2px solid var(--ink); }
.results-heading h2 { margin: 0; font: 600 30px/1.2 var(--song); }
.results-heading > p { margin: 0; color: var(--ink-soft); font-size: 12px; }
.results { counter-reset: cases; }
.case-card { counter-increment: cases; width: 100%; display: grid; grid-template-columns: 44px 84px 1fr 30px; gap: 22px; align-items: center; padding: 25px 4px; text-align: left; border: 0; border-bottom: 1px solid var(--rule); background: transparent; cursor: pointer; }
.case-card:hover { background: rgba(255,255,255,.62); }
.card-index::before { content: counter(cases, decimal-leading-zero); color: var(--ink-soft); font: 11px/1 var(--sans); }
.card-glyph { min-height: 72px; display: grid; place-items: center; }
.mini-hex { width: 56px; display: grid; gap: 5px; }
.mini-hex i { height: 4px; background: var(--ink); }
.mini-hex i.yin { background: linear-gradient(90deg,var(--ink) 0 41%,transparent 41% 59%,var(--ink) 59%); }
.card-main { min-width: 0; display: grid; gap: 7px; }
.card-path { color: var(--mineral); font-size: 12px; font-weight: 700; }
.card-title { font: 600 22px/1.35 var(--song); }
.card-summary { display: -webkit-box; overflow: hidden; color: var(--ink-soft); font: 15px/1.7 var(--song); -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.card-source { color: #7b8583; font-size: 11px; }
.card-open { color: var(--seal); font-size: 18px; }
.empty { padding: 90px 20px; text-align: center; border-bottom: 1px solid var(--rule); }
.empty span { color: var(--mineral); font-size: 32px; }
.empty h3 { font: 600 24px/1.4 var(--song); }
.empty p { color: var(--ink-soft); }

dialog { width: min(920px,calc(100vw - 30px)); max-height: calc(100vh - 30px); padding: 0; border: 0; background: var(--paper); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(18,28,30,.45); backdrop-filter: blur(4px); }
.case-detail { position: relative; padding: clamp(28px,5vw,68px); }
.dialog-close { position: sticky; top: 16px; float: right; z-index: 2; width: 40px; height: 40px; border: 1px solid var(--rule); background: var(--paper); cursor: pointer; font-size: 24px; }
.detail-kicker { color: var(--mineral); font-size: 12px; font-weight: 700; letter-spacing: .12em; }
.detail-title { max-width: 720px; margin: 14px 0 20px; font: 600 clamp(30px,5vw,48px)/1.25 var(--song); }
.detail-meta { display: flex; gap: 8px; flex-wrap: wrap; padding: 14px 0 24px; border-top: 1px solid var(--ink); }
.detail-meta span { padding: 5px 9px; background: var(--mineral-pale); color: var(--mineral); font-size: 12px; }
.detail-meta .demo-badge { background: #f5ead5; color: #7a4e16; }
.hexagram-panel { display: flex; align-items: center; justify-content: center; gap: clamp(22px,5vw,52px); margin: 6px 0 34px; padding: 28px 20px; border: 1px solid var(--rule); background: var(--porcelain); }
.hexagram { display: grid; justify-items: center; gap: 5px; min-width: 120px; }
.hexagram strong { font: 600 18px/1.4 var(--song); }
.hexagram small { color: var(--ink-soft); font-size: 11px; }
.yao-stack { display: grid; gap: 6px; margin-bottom: 7px; }
.yao { display: flex; width: 82px; height: 6px; }
.yao.yang { background: var(--ink); }
.yao.yin { justify-content: space-between; }
.yao.yin i { display: block; width: 34px; background: var(--ink); }
.change-arrow { color: var(--seal); font: 32px/1 var(--song); }
.change-label { color: var(--seal); font-size: 13px; font-weight: 700; }
.detail-body { max-width: 740px; font: 18px/2 var(--song); }
.detail-body h3 { margin: 34px 0 10px; color: var(--seal); font: 700 15px/1.5 var(--sans); letter-spacing: .08em; }
.detail-body p { margin: 0 0 20px; text-align: justify; }
.detail-source { margin-top: 42px; padding-top: 16px; border-top: 1px solid var(--rule); color: var(--ink-soft); font-size: 12px; }
.analysis-figures { margin: 26px 0; padding: 15px; border: 1px solid var(--rule); background: var(--porcelain); }
.analysis-figures h4 { margin: 0 0 10px; color: var(--ink-soft); font-size: 12px; }
.svg-diagram { background: white; border: 1px solid var(--rule); }
.svg-diagram svg { display: block; width: 100%; height: auto; }
.svg-yao,.svg-arrow { stroke: var(--ink); stroke-linecap: square; fill: none; }
.svg-large-li-block { fill: none; stroke: var(--ink); stroke-width: 4; }
.svg-arrow { stroke-width: 2; }
.svg-diagram marker path { fill: var(--ink); }
.svg-diagram text { font-family: var(--sans); fill: var(--ink); }
.svg-node-title { font-size: 17px; font-weight: 700; }
.svg-node-sub,.svg-note { font-size: 13px; fill: var(--ink-soft)!important; }
.svg-arrow-label,.svg-row-label { font-size: 13px; fill: var(--seal)!important; }
.diagram-caption { margin: 8px 0 0; color: var(--ink-soft); font-size: 12px; }

@media (max-width: 860px) {
  .masthead > p { display: none; }
  .search-stage { min-height: auto; grid-template-columns: 1fr; padding-top: 48px; }
  .archive-stats { gap: 18px; }
  .archive-stats div { display: block; }
  .archive-stats dd { margin-top: 7px; }
}

@media (max-width: 560px) {
  .search-stage { padding: 40px 20px 38px; }
  .archive { padding: 36px 18px 70px; }
  .hexagram-heading { align-items: start; }
  .hexagram-heading h2 { font-size: 25px; }
  .hexagram-select-bar { grid-template-columns: 64px minmax(0,1fr); max-width: none; }
  .selected-hexagram { min-height: 78px; }
  .hexagram-select-wrap { padding-inline: 14px; }
  .hexagram-select-wrap select { font-size: 16px; }
  .hexagram-select-bar > button { grid-column: 1 / -1; min-height: 42px; border-top: 1px solid var(--rule); border-left: 0; }
  .archive-stats { grid-template-columns: repeat(2,1fr); }
  .results-area { margin-top: 48px; }
  .results-heading { align-items: start; }
  .results-heading > p { display: none; }
  .case-card { grid-template-columns: 26px 52px 1fr; gap: 12px; }
  .card-open { display: none; }
  .mini-hex { width: 42px; }
  .card-title { font-size: 19px; }
  .card-summary { font-size: 14px; -webkit-line-clamp: 3; }
  .case-detail { padding: 24px 20px 40px; }
  .detail-body { font-size: 17px; }
  .hexagram-panel { gap: 15px; padding: 22px 10px; }
  .hexagram { min-width: 92px; }
  .yao { width: 66px; height: 5px; }
  .yao.yin i { width: 27px; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }