/* 易经六十四卦 · 经卷版式 */

:root {
  --paper: #f3ede0;
  --paper-deep: #ece4d4;
  --card: #fbf8f0;
  --ink: #201c16;
  --ink-2: #574e41;
  --ink-3: #877d6c;
  --accent: #993a22;
  --gold: #ab8550;
  --line: rgba(66, 54, 36, 0.16);
  --line-strong: rgba(66, 54, 36, 0.3);
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;
  --kai: "Kaiti SC", "STKaiti", "KaiTi", "Songti SC", serif;
  --max: 1120px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.75;
  background:
    radial-gradient(1200px 520px at 50% -12%, #fbf7ec 0%, rgba(251, 247, 236, 0) 62%),
    var(--paper);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

img { max-width: 100%; }

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

/* 顶栏 */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(243, 237, 224, 0.9);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--kai);
  font-size: 20px;
  letter-spacing: 0.06em;
}

.brand .seal {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 15px;
  line-height: 1;
  border-radius: 2px;
  background: rgba(153, 58, 34, 0.06);
}

.brand small {
  color: var(--ink-3);
  font-size: 12px;
  letter-spacing: 0.18em;
  margin-left: 2px;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14px;
  letter-spacing: 0.06em;
}

.topnav a {
  color: var(--ink-2);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

.topnav a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* 首页 */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 288px;
  gap: 40px;
  align-items: center;
  padding: 74px 0 46px;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.hero-copy { min-width: 0; }

.hero-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 6px 8px;
  color: var(--accent);
  opacity: 0.28;
  font-size: 19px;
  line-height: 1;
  text-align: center;
  user-select: none;
}

.hero-grid span { color: var(--glyph, var(--accent)); }

.hero .eyebrow {
  margin: 0 0 18px;
  color: var(--gold);
  font-size: 12px;
  letter-spacing: 0.42em;
}

.hero h1 {
  margin: 0;
  font-family: var(--kai);
  font-weight: 500;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.18;
  letter-spacing: 0.04em;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero .lede {
  margin: 22px 0 0;
  max-width: 34em;
  color: var(--ink-2);
  font-size: 16.5px;
  line-height: 1.95;
}

.hero .meta {
  margin-top: 30px;
  display: flex;
  gap: 28px;
  color: var(--ink-3);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.hero .meta b {
  color: var(--ink);
  font-weight: 500;
  font-family: var(--kai);
  font-size: 20px;
  margin-right: 6px;
}

/* 章节 */

.section { padding: 54px 0 10px; }

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 8px;
}

.sec-head h2 {
  margin: 0;
  font-family: var(--kai);
  font-weight: 500;
  font-size: 26px;
  letter-spacing: 0.06em;
}

.sec-head .rule {
  flex: 1;
  height: 1px;
  background: var(--line);
  transform: translateY(-4px);
}

.sec-head .idx {
  color: var(--gold);
  font-size: 12px;
  letter-spacing: 0.2em;
}

.sec-note {
  margin: 0 0 22px;
  color: var(--ink-3);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* 上下卦矩阵 */

.matrix-scroll {
  overflow-x: auto;
  border: 1px solid var(--line-strong);
  background: var(--card);
  box-shadow: 0 18px 40px -32px rgba(60, 45, 25, 0.55);
}

.matrix {
  display: grid;
  grid-template-columns: 92px repeat(8, minmax(96px, 1fr));
  min-width: 880px;
}

.matrix .corner,
.matrix .axis {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding: 12px 10px;
  background: var(--paper-deep);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.matrix .axis { position: relative; }

.matrix .axis-no {
  position: absolute;
  top: 6px;
  left: 8px;
  color: var(--axis-tone, var(--gold));
  font-family: var(--serif);
  font-size: 10.5px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0;
}

.matrix .corner {
  font-size: 11.5px;
  color: var(--ink-3);
  letter-spacing: 0.12em;
  line-height: 1.9;
}

.matrix .axis .tri {
  font-size: 15px;
  color: var(--gold);
  line-height: 1;
}

.matrix .axis .tri svg {
  display: block;
  width: 52px;
  height: auto;
  margin: 0 auto 3px;
}

.matrix .axis .ax-name {
  font-family: var(--kai);
  font-size: 15px;
  letter-spacing: 0.08em;
}

.matrix .axis { border-bottom: 1px solid var(--line); }

.matrix .row-axis {
  text-align: left;
  align-items: flex-start;
  padding-left: 16px;
}

.cell {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 27px 12px 12px;
  text-decoration: none;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  position: relative;
  background-color: #fffdf7;
  background:
    linear-gradient(145deg,
      color-mix(in srgb, var(--upper-color, var(--gold)) 7%, #fffdf7),
      color-mix(in srgb, var(--lower-color, var(--gold)) 5%, #fffdf7));
  transition: background 0.16s ease;
}

.cell-code,
.cell-order {
  position: absolute;
  top: 7px;
  font-family: var(--serif);
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0;
}

.cell-code {
  left: 8px;
  display: inline-flex;
  gap: 1px;
  color: var(--ink-3);
}

.cell-order {
  right: 8px;
  color: var(--accent);
}

.cell:hover {
  background:
    linear-gradient(145deg,
      color-mix(in srgb, var(--upper-color, var(--gold)) 14%, #fffdf7),
      color-mix(in srgb, var(--lower-color, var(--gold)) 10%, #fffdf7));
  box-shadow: inset 0 0 0 1px rgba(153, 58, 34, 0.55);
}

.cell:hover .nm { color: var(--accent); }

.cell .hx {
  font-size: 15px;
  line-height: 1.2;
  color: var(--gold);
}

.cell .hx svg {
  display: block;
  width: min(70px, 100%);
  height: auto;
  margin: 2px auto 4px;
}

.cell .nm {
  font-family: var(--kai);
  font-size: 17px;
  letter-spacing: 0.06em;
  line-height: 1.35;
}

.cell .sub {
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: 0.02em;
}

.cell .mo {
  font-size: 11.5px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}

/* 卦序 */

.order-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
  border-left: 1px solid var(--line-strong);
  background: var(--card);
}

.order-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 13px 14px;
  text-decoration: none;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background 0.16s ease, color 0.16s ease;
}

.order-item:hover { background: #fffdf7; color: var(--accent); }

.order-item .no {
  font-family: var(--serif);
  font-size: 12px;
  color: var(--gold);
  min-width: 22px;
  letter-spacing: 0.04em;
}

.order-item .nm { font-family: var(--kai); font-size: 16px; letter-spacing: 0.04em; }

.order-item .full { margin-left: auto; color: var(--ink-3); font-size: 11.5px; }

/* 详情页 */

.detail-top {
  padding: 30px 0 0;
}

.crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12.5px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
}

.crumbs a { color: var(--ink-2); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.crumbs .sep { color: var(--gold); }

.gua-head {
  display: flex;
  align-items: flex-start;
  gap: 26px;
  padding: 26px 0 30px;
  border-bottom: 1px solid var(--line-strong);
}

.gua-mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 96px;
  height: 96px;
  border: 1px solid color-mix(in srgb, var(--lower-color, var(--gold)) 30%, var(--line-strong));
  background-color: var(--card);
  background:
    linear-gradient(145deg,
      color-mix(in srgb, var(--upper-color, var(--card)) 15%, var(--card)),
      color-mix(in srgb, var(--lower-color, var(--card)) 10%, var(--card)));
  font-size: 56px;
  line-height: 1;
  color: var(--accent);
}

.mark-svg {
  display: block;
  width: 72px;
  height: 72px;
}

.gua-head .order {
  margin: 2px 0 6px;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--gold);
}

.gua-head h1 {
  margin: 0;
  font-family: var(--kai);
  font-weight: 500;
  font-size: clamp(36px, 5vw, 52px);
  line-height: 1.15;
  letter-spacing: 0.08em;
}

.name-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}

.name-row .fullname {
  font-family: var(--kai);
  font-size: 21px;
  color: var(--ink-2);
  letter-spacing: 0.12em;
}

.gua-head .facts {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 13px;
  color: var(--ink-2);
  letter-spacing: 0.04em;
}

.gua-head .facts b { font-weight: 500; color: var(--ink); }

.gua-head .facts .tri-token {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.gua-head .facts .tri-token::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--tone);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--tone) 40%, var(--line-strong));
}

/* 四象图 */

.plates {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  padding: 30px 0 8px;
}

.plate {
  margin: 0;
  position: relative;
  overflow: hidden;
  background-color: var(--card);
  background:
    linear-gradient(145deg,
      color-mix(in srgb, var(--upper-color, var(--card)) 11%, var(--card)),
      color-mix(in srgb, var(--lower-color, var(--card)) 8%, var(--card)));
  border: 1px solid color-mix(in srgb, var(--lower-color, var(--gold)) 23%, var(--line));
  padding: 16px 12px 10px;
  text-align: center;
}

.plate::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg,
    var(--upper-color, var(--gold)) 0 50%,
    var(--lower-color, var(--gold)) 50% 100%);
}

.plate img { display: block; width: 190px; max-width: 100%; height: auto; margin: 0 auto; }

.plate figcaption {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.plate .tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--kai);
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--ink);
}

.plate .tag::before {
  content: "";
  width: 15px;
  height: 4px;
  border-radius: 99px;
  background: linear-gradient(90deg,
    var(--upper-color, var(--gold)) 0 50%,
    var(--lower-color, var(--gold)) 50% 100%);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--lower-color, var(--gold)) 20%, var(--line));
}

.plate .cap {
  display: block;
  margin-top: 2px;
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.01em;
  line-height: 1.5;
}

/* 正文 */

.detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 168px;
  gap: 56px;
  align-items: start;
  padding: 10px 0 30px;
}

.gua-body { padding: 22px 0 20px; }

.toc {
  position: sticky;
  top: 86px;
  margin-top: 34px;
  padding-left: 18px;
  border-left: 1px solid var(--line);
  font-size: 13px;
}

.toc-title {
  margin: 0 0 10px;
  color: var(--gold);
  font-size: 11.5px;
  letter-spacing: 0.22em;
}

.toc ol { margin: 0; padding: 0; list-style: none; }

.toc li a {
  display: block;
  padding: 5px 0;
  color: var(--ink-2);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.toc li a:hover { color: var(--accent); }

.chapter { max-width: 41em; padding: 30px 0 6px; border-bottom: 1px solid var(--line); }
.chapter:last-of-type { border-bottom: 0; }

.chapter h2 {
  margin: 0 0 4px;
  font-family: var(--kai);
  font-weight: 500;
  font-size: 24px;
  letter-spacing: 0.1em;
  display: flex;
  align-items: center;
  gap: 12px;
}

.chapter h2::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--accent);
  transform: rotate(45deg);
  flex: 0 0 auto;
}

.chapter .kicker {
  margin: 0 0 14px 20px;
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.14em;
}

.prose {
  font-size: 16.5px;
  line-height: 2.05;
  color: #2b261e;
  text-align: justify;
}

.prose .lbl {
  display: block;
  margin: 1.15em 0 0.28em;
  font-family: var(--kai);
  font-weight: 500;
  font-size: 15px;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-align: left;
}

.prose .lbl:first-child { margin-top: 0.4em; }

.prose .lines { margin: 0 0 0.85em; }

.prose .inline-fig {
  display: block;
  position: relative;
  overflow: hidden;
  width: min(100%, 380px);
  margin: 18px auto;
  max-width: 100%;
  text-align: center;
  background-color: var(--card);
  background:
    linear-gradient(145deg,
      color-mix(in srgb, var(--upper-color, var(--card)) 9%, var(--card)),
      color-mix(in srgb, var(--lower-color, var(--card)) 7%, var(--card)));
  border: 1px solid color-mix(in srgb, var(--lower-color, var(--gold)) 22%, var(--line));
  padding: 14px 10px 10px;
}

.prose .inline-fig::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: linear-gradient(90deg,
    var(--upper-color, var(--gold)) 0 50%,
    var(--lower-color, var(--gold)) 50% 100%);
}

.prose .inline-fig img { display: block; width: 100%; max-width: 100%; height: auto; margin: 0 auto; }

.prose .inline-fig figcaption {
  display: flex;
  justify-content: space-between;
  gap: 8px 14px;
  flex-wrap: wrap;
  margin-top: 8px;
  padding-top: 7px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  line-height: 1.5;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  text-align: left;
}

/* 上下篇 */

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding: 34px 0 60px;
  border-top: 1px solid var(--line-strong);
  margin-top: 20px;
}

.pager a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  text-decoration: none;
  background: var(--card);
  border: 1px solid var(--line);
  transition: border-color 0.16s ease, background 0.16s ease;
}

.pager a:hover { border-color: var(--accent); background: #fffdf7; }

.pager .dir { font-size: 11.5px; letter-spacing: 0.2em; color: var(--gold); }
.pager .name { font-family: var(--kai); font-size: 19px; letter-spacing: 0.06em; }
.pager .next { text-align: right; align-items: flex-end; }
.pager .empty { visibility: hidden; }

/* 页脚 */

.foot {
  border-top: 1px solid var(--line);
  padding: 26px 0 40px;
  color: var(--ink-3);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  justify-content: flex-end;
}

.foot a { color: var(--ink-2); text-decoration: none; border-bottom: 1px solid var(--line-strong); }
.foot a:hover { color: var(--accent); }

/* 窄屏 */

@media (max-width: 900px) {
  .hero { display: block; }
  .hero-grid { display: none; }
  .detail-layout { display: block; }
  .toc { display: none; }
  .wrap { padding: 0 18px; }
  .hero { padding: 52px 0 34px; }
  .hero .meta { gap: 18px; flex-wrap: wrap; }
  .section { padding: 40px 0 6px; }
  .order-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .plates { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gua-head { gap: 18px; padding: 20px 0 24px; }
  .gua-mark { width: 74px; height: 74px; font-size: 42px; }
  .prose { font-size: 16px; line-height: 1.95; }
  .topnav { gap: 16px; font-size: 13px; }
  .order-item .full { display: none; }
}

@media (max-width: 560px) {
  .hero h1 { font-size: 38px; }
  .topbar-inner { height: 56px; gap: 10px; }
  .brand { font-size: 16px; letter-spacing: 0; gap: 7px; flex-shrink: 0; }
  .brand .seal { width: 23px; height: 23px; font-size: 13px; }
  .brand small { display: none; }
  .topnav { gap: 10px; font-size: 12px; letter-spacing: 0; flex-shrink: 0; }
  .name-row { gap: 10px; }
  .name-row .fullname { font-size: 16px; }
  .chapter h2 { font-size: 21px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; align-items: flex-start; }
}