/* ============================================================
   维基体育赛事 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, h6, p,
ul, ol, li, dl, dd, dt,
figure, blockquote { margin: 0; padding: 0; }

ul, ol { list-style: none; }

img, svg, video { display: block; max-width: 100%; }

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid var(--c-turf);
  outline-offset: 3px;
  border-radius: 2px;
}

[id] { scroll-margin-top: 132px; }

/* ---------- 2. 变量 ---------- */
:root {
  --c-lake: #062A33;
  --c-night: #0B3C49;
  --c-cobalt: #1B4FD8;
  --c-cobalt-soft: #4C7BEA;
  --c-turf: #39E67A;
  --c-turf-ink: #04231A;
  --c-amber: #FFB02E;
  --c-signal: #FF4B4B;
  --c-mist: #F2F6F7;
  --c-paper: #FFFFFF;
  --c-ink: #0A1418;
  --c-fog: #DCE9EC;
  --c-hair: #1E5A66;

  --ink-78: rgba(10, 20, 24, .78);
  --ink-62: rgba(10, 20, 24, .62);
  --ink-48: rgba(10, 20, 24, .48);
  --ink-16: rgba(10, 20, 24, .16);
  --ink-08: rgba(10, 20, 24, .08);
  --fog-86: rgba(220, 233, 236, .86);
  --fog-64: rgba(220, 233, 236, .64);
  --fog-34: rgba(220, 233, 236, .34);
  --fog-16: rgba(220, 233, 236, .16);

  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --fs-eyebrow: 15px;
  --fs-body: 17px;
  --fs-sub: 22px;
  --fs-rail: 34px;
  --fs-block: 52px;
  --fs-display: clamp(40px, 7.4vw, 88px);

  --wrap: 1320px;
  --pad: clamp(18px, 4vw, 48px);
  --gap: clamp(16px, 2.4vw, 32px);
  --r: 2px;
}

/* ---------- 3. 基底与中文排版 ---------- */
body {
  background: var(--c-mist);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.75;
  font-weight: 400;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.02em;
}

strong { font-weight: 700; }

.num,
[data-num] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

.wrap {
  width: min(var(--wrap), 100%);
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: absolute;
  left: var(--pad);
  top: -120px;
  z-index: 120;
  padding: 11px 20px;
  background: var(--c-turf);
  color: var(--c-turf-ink);
  font-weight: 700;
  font-size: 15px;
  border-radius: var(--r);
  transition: top .2s ease;
}

.skip-link:focus { top: 14px; }

/* ---------- 5. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background:
    linear-gradient(180deg, rgba(6, 42, 51, .97), rgba(6, 42, 51, .9));
  color: var(--c-fog);
  border-bottom: 1px solid var(--c-hair);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

/* 上层：品牌说明与更新节奏 */
.header-ledger {
  max-height: 92px;
  overflow: hidden;
  border-bottom: 1px solid rgba(30, 90, 102, .7);
  transition: max-height .28s ease, opacity .2s ease, border-color .2s ease;
}

.site-header[data-scrolled] .header-ledger {
  max-height: 0;
  opacity: 0;
  border-color: transparent;
}

.header-ledger__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 3vw, 40px);
  padding-block: 10px;
  font-size: 13px;
  letter-spacing: .02em;
}

.ledger-brand {
  color: var(--c-fog);
  font-weight: 600;
}

.ledger-rhythm {
  color: var(--fog-64);
  font-size: 12.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 下层：主导航 */
.header-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.4vw, 30px);
  padding-block: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand__mark {
  position: relative;
  width: 36px;
  height: 36px;
  background: linear-gradient(140deg, var(--c-cobalt), var(--c-cobalt-soft));
  clip-path: polygon(0 34%, 100% 0, 100% 72%, 0 100%);
  box-shadow: 0 0 0 1px rgba(220, 233, 236, .18);
}

.brand__mark::after {
  content: "";
  position: absolute;
  right: 7px;
  bottom: 8px;
  width: 8px;
  height: 8px;
  background: var(--c-turf);
}

.brand__text { display: grid; gap: 1px; }

.brand__name {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .01em;
  color: #fff;
  line-height: 1.2;
}

.brand__tag {
  font-family: var(--font-serif);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--fog-64);
  line-height: 1.3;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 15px;
  border: 1px solid var(--fog-34);
  border-radius: 999px;
  background: rgba(220, 233, 236, .06);
  color: var(--c-fog);
  font-size: 14px;
  font-weight: 600;
}

.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }

.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .24s ease, opacity .2s ease;
}

.site-header[data-open] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.5vw, 20px);
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: 15px;
  font-weight: 500;
  color: var(--fog-86);
  transition: color .18s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  background: var(--c-turf);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .22s ease;
}

.site-nav__link:hover { color: #fff; }
.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] { color: var(--c-turf); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.site-nav__cta { flex: 0 0 auto; }

.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: var(--c-turf);
  transform: scaleX(0);
  transform-origin: left center;
  box-shadow: 0 0 14px rgba(57, 230, 122, .55);
  transition: transform .1s linear;
  pointer-events: none;
}

/* ---------- 6. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--r);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.4;
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .18s ease;
}

.btn:hover { transform: translateY(-1px); }

.btn--primary {
  background: var(--c-turf);
  color: var(--c-turf-ink);
  border-color: var(--c-turf);
}

.btn--primary:hover { background: #5BF29A; border-color: #5BF29A; }

.btn--cobalt {
  background: var(--c-cobalt);
  color: #fff;
  border-color: var(--c-cobalt);
}

.btn--cobalt:hover { background: #1640B4; border-color: #1640B4; }

.btn--ghost {
  background: rgba(220, 233, 236, .06);
  border-color: var(--fog-34);
  color: var(--c-fog);
}

.btn--ghost:hover {
  border-color: var(--c-turf);
  color: var(--c-turf);
  background: rgba(57, 230, 122, .1);
}

.btn--line {
  background: transparent;
  border-color: var(--ink-16);
  color: var(--c-ink);
}

.btn--line:hover {
  background: var(--c-cobalt);
  border-color: var(--c-cobalt);
  color: #fff;
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--c-lake);
  color: var(--c-fog);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30, 90, 102, .18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 90, 102, .18) 1px, transparent 1px);
  background-size: 52px 52px;
  opacity: .5;
  pointer-events: none;
}

.footer-slab {
  position: relative;
  background: linear-gradient(122deg, rgba(27, 79, 216, .34), rgba(11, 60, 73, .94) 58%), var(--c-night);
  clip-path: polygon(0 12%, 100% 0, 100% 100%, 0 100%);
  padding-top: clamp(66px, 8vw, 118px);
}

.footer-slab__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: clamp(20px, 3vw, 44px);
  padding-bottom: clamp(40px, 5vw, 72px);
}

.footer-slab__lead { max-width: 30ch; }

.footer-eyebrow {
  font-family: var(--font-serif);
  font-size: var(--fs-eyebrow);
  letter-spacing: .1em;
  color: var(--c-turf);
  margin-bottom: 12px;
}

.footer-title {
  font-size: clamp(24px, 3.6vw, 44px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: #fff;
}

.footer-cta { flex: 0 0 auto; }

.footer-body { position: relative; padding-block: clamp(40px, 5vw, 72px); }

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3.4vw, 48px);
}

.footer-col--brand { max-width: 34ch; }

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.footer-brand__mark {
  width: 26px;
  height: 26px;
  background: linear-gradient(140deg, var(--c-cobalt-soft), var(--c-cobalt));
  clip-path: polygon(0 34%, 100% 0, 100% 72%, 0 100%);
  flex: 0 0 auto;
}

.footer-brand__name {
  font-size: 17px;
  font-weight: 800;
  color: #fff;
  letter-spacing: .02em;
}

.footer-brand__line {
  font-size: 14px;
  line-height: 1.72;
  color: var(--fog-64);
}

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 16px;
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: .16em;
  color: var(--fog-64);
}

.footer-col__title::before {
  content: "";
  width: 16px;
  height: 2px;
  background: var(--c-turf);
  flex: 0 0 auto;
}

.footer-list li + li { margin-top: 11px; }

.footer-link {
  font-size: 15px;
  color: var(--fog-86);
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.footer-link:hover {
  color: #fff;
  border-color: var(--c-turf);
}

.footer-base {
  position: relative;
  border-top: 1px solid var(--c-hair);
  padding-block: clamp(26px, 3vw, 38px) clamp(34px, 4vw, 48px);
  font-size: 13px;
}

.footer-base__inner {
  display: grid;
  gap: 9px;
}

.footer-contact { color: var(--c-fog); font-size: 13.5px; }

.footer-note {
  color: var(--fog-64);
  line-height: 1.7;
  max-width: 78ch;
}

.footer-data {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--c-cobalt-soft);
}

.footer-legal {
  color: var(--fog-64);
  font-size: 12.5px;
  letter-spacing: .02em;
}

/* ---------- 8. 分区与眉题 ---------- */
.section { padding-block: clamp(56px, 8vw, 120px); }

.section--dark {
  background: var(--c-lake);
  color: var(--c-fog);
}

.section--dark h2,
.section--dark h3 { color: #fff; }

.section--mist { background: var(--c-mist); }

.section--paper { background: var(--c-paper); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: var(--fs-eyebrow);
  letter-spacing: .1em;
  color: var(--c-cobalt);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  flex: 0 0 auto;
}

.section--dark .eyebrow { color: var(--c-turf); }

.section-head {
  display: grid;
  gap: 14px;
  max-width: 66ch;
  margin-bottom: clamp(28px, 4vw, 56px);
}

.section-title {
  font-size: clamp(26px, 3.4vw, var(--fs-rail));
  font-weight: 800;
}

.section-title--block { font-size: clamp(30px, 4.4vw, var(--fs-block)); }

.section-note {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-62);
  max-width: 48ch;
}

.section--dark .section-note { color: var(--fog-64); }

/* ---------- 9. 正文容器 ---------- */
.prose {
  max-width: 46rem;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--ink-78);
}

.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  margin-top: 2.1em;
  font-size: clamp(22px, 2.6vw, 28px);
  color: var(--c-ink);
  letter-spacing: -.015em;
}

.prose h3 {
  margin-top: 1.7em;
  font-size: var(--fs-sub);
  color: var(--c-ink);
}

.prose ul,
.prose ol {
  padding-left: 1.4em;
  list-style: disc;
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: .5em; }

.prose blockquote {
  border-left: 3px solid var(--c-turf);
  padding: 4px 0 4px 20px;
  color: var(--ink-62);
}

.prose a {
  color: var(--c-cobalt);
  border-bottom: 1px solid rgba(27, 79, 216, .35);
}

.prose a:hover { border-color: var(--c-cobalt); }

.section--dark .prose { color: var(--fog-86); }
.section--dark .prose h2,
.section--dark .prose h3 { color: #fff; }
.section--dark .prose a { color: var(--c-turf); border-color: rgba(57, 230, 122, .4); }

/* ---------- 10. 面包屑 ---------- */
.crumbs { font-size: 13.5px; color: var(--ink-62); }

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.crumbs__item { display: inline-flex; align-items: center; }

.crumbs__item:not(:last-child)::after {
  content: "/";
  margin-inline: 9px;
  color: var(--ink-48);
}

.crumbs__link { color: var(--c-cobalt); }
.crumbs__link:hover { border-bottom: 1px solid currentColor; }

.crumbs__current { color: var(--ink-78); font-weight: 600; }

.crumbs--dark { color: var(--fog-64); }
.crumbs--dark .crumbs__link { color: var(--c-turf); }
.crumbs--dark .crumbs__current { color: var(--c-fog); }

/* ---------- 11. 网格骨架 ---------- */
.grid { display: grid; gap: var(--gap); }

.grid--duo { grid-template-columns: minmax(0, 1fr); }
.grid--5-7 { grid-template-columns: minmax(0, 1fr); }
.grid--4-8 { grid-template-columns: minmax(0, 1fr); }
.grid--index { grid-template-columns: minmax(0, 1fr); }

@media (min-width: 760px) {
  .grid--duo { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 920px) {
  .grid--5-7 { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
  .grid--4-8 { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); }
}

@media (min-width: 1120px) {
  .grid--index {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: start;
  }
}

/* ---------- 12. 半透明层与图形 ---------- */
.glass {
  background: rgba(220, 233, 236, .07);
  border: 1px solid var(--fog-16);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.glass--light {
  background: rgba(255, 255, 255, .68);
  border-color: var(--ink-08);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.slant {
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 92%);
}

.grid-tex {
  background-image:
    linear-gradient(rgba(30, 90, 102, .16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 90, 102, .16) 1px, transparent 1px);
  background-size: 44px 44px;
}

/* ---------- 13. 图像容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(140deg, var(--c-night), var(--c-lake));
}

.media--21x9 { aspect-ratio: 21 / 9; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--square { aspect-ratio: 1 / 1; }

.media--slant { clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%); }

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__badge {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 5px 11px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--c-fog);
  background: rgba(6, 42, 51, .58);
  border: 1px solid var(--fog-34);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.media__overlay {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: grid;
  gap: 5px;
  padding: clamp(14px, 2vw, 24px);
  color: var(--c-fog);
  background: linear-gradient(180deg, rgba(6, 42, 51, 0), rgba(6, 42, 51, .9));
}

.media__data {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-turf);
}

.media__caption {
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.66;
  color: var(--ink-48);
}

/* ---------- 14. 数据组件 ---------- */
.score {
  display: inline-grid;
  grid-auto-flow: column;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border: 1px solid rgba(255, 176, 46, .45);
  background: rgba(6, 42, 51, .74);
}

.score__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-amber);
}

.score__sep { color: var(--fog-34); }

.score__label {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--fog-64);
}

.stat {
  display: grid;
  gap: 7px;
  padding: 16px 0;
  border-top: 1px solid var(--c-hair);
}

.stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-amber);
}

.stat__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--fog-64);
}

.section--mist .stat,
.section--paper .stat { border-top-color: var(--ink-16); }

.section--mist .stat__num,
.section--paper .stat__num { color: var(--c-cobalt); }

.section--mist .stat__label,
.section--paper .stat__label { color: var(--ink-62); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--r);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .04em;
  white-space: nowrap;
}

.tag--turf {
  color: #147C43;
  background: rgba(57, 230, 122, .16);
  border: 1px solid rgba(57, 230, 122, .42);
}

.tag--amber {
  color: #9A6208;
  background: rgba(255, 176, 46, .18);
  border: 1px solid rgba(255, 176, 46, .48);
}

.tag--signal {
  color: #C42C2C;
  background: rgba(255, 75, 75, .14);
  border: 1px solid rgba(255, 75, 75, .42);
}

.section--dark .tag--turf { color: var(--c-turf); background: rgba(57, 230, 122, .12); }
.section--dark .tag--amber { color: var(--c-amber); background: rgba(255, 176, 46, .12); }
.section--dark .tag--signal { color: #FF7B7B; background: rgba(255, 75, 75, .14); }

/* 数据表 */
.data-table {
  font-size: 14.5px;
  font-variant-numeric: tabular-nums;
}

.data-table caption {
  text-align: left;
  padding-bottom: 10px;
  font-size: 13px;
  color: var(--ink-48);
}

.data-table th,
.data-table td {
  padding: 11px 14px;
  text-align: left;
  border-bottom: 1px solid var(--ink-16);
}

.data-table thead th {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ink-62);
  background: var(--c-mist);
  border-bottom: 1px solid var(--c-hair);
}

.data-table td.num {
  font-family: var(--font-mono);
  color: var(--c-cobalt);
}

.data-table tbody tr:hover { background: rgba(27, 79, 216, .05); }

.section--dark .data-table { color: var(--fog-86); }
.section--dark .data-table th,
.section--dark .data-table td { border-bottom-color: rgba(30, 90, 102, .8); }
.section--dark .data-table thead th {
  color: var(--fog-64);
  background: rgba(11, 60, 73, .7);
}
.section--dark .data-table td.num { color: var(--c-turf); }
.section--dark .data-table tbody tr:hover { background: rgba(220, 233, 236, .06); }

/* 数字翻转 */
@keyframes flip-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

.num-flip { animation: flip-in .18s ease; }

/* ---------- 15. 卡片与芯片 ---------- */
.card {
  position: relative;
  display: grid;
  gap: 12px;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--c-paper);
  border: 1px solid var(--ink-08);
}

.card--glass {
  background: rgba(220, 233, 236, .07);
  border-color: var(--fog-16);
  color: var(--c-fog);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.card--slant { clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%); }

.card__eyebrow {
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--c-cobalt);
}

.card--glass .card__eyebrow { color: var(--c-turf); }

.card__title {
  font-size: clamp(18px, 2vw, var(--fs-sub));
  font-weight: 700;
  line-height: 1.32;
  color: var(--c-ink);
}

.card--glass .card__title { color: #fff; }

.card__meta {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-62);
}

.card--glass .card__meta { color: var(--fog-64); }

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  padding: 7px 15px;
  border: 1px solid var(--ink-16);
  border-radius: 999px;
  background: var(--c-paper);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--ink-62);
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}

.chip:hover { border-color: var(--c-cobalt); color: var(--c-cobalt); }

.chip[aria-pressed="true"] {
  background: var(--c-cobalt);
  border-color: var(--c-cobalt);
  color: #fff;
}

.section--dark .chip {
  background: rgba(220, 233, 236, .06);
  border-color: var(--fog-34);
  color: var(--fog-86);
}

.section--dark .chip:hover { border-color: var(--c-turf); color: var(--c-turf); }

.section--dark .chip[aria-pressed="true"] {
  background: var(--c-turf);
  border-color: var(--c-turf);
  color: var(--c-turf-ink);
}

/* ---------- 16. 延伸入口层 ---------- */
.more-list {
  display: grid;
  border-top: 1px solid var(--c-hair);
}

.more-list__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 2px;
  border-bottom: 1px solid rgba(30, 90, 102, .55);
  font-size: 14.5px;
}

.more-list__label { color: var(--c-fog); }
.more-list__label:hover { color: var(--c-turf); }

.more-list__meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--fog-64);
  white-space: nowrap;
}

.more-list--light { border-top-color: var(--ink-16); }
.more-list--light .more-list__item { border-bottom-color: var(--ink-16); }
.more-list--light .more-list__label { color: var(--ink-78); }
.more-list--light .more-list__label:hover { color: var(--c-cobalt); }
.more-list--light .more-list__meta { color: var(--ink-48); }

/* ---------- 17. 章节目录与返回顶部 ---------- */
.toc {
  position: sticky;
  top: 132px;
  display: grid;
  gap: 4px;
  font-size: 14px;
}

.toc__title {
  margin-bottom: 8px;
  font-family: var(--font-serif);
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--ink-48);
}

.toc__link {
  display: block;
  padding: 8px 0 8px 15px;
  border-left: 2px solid var(--ink-16);
  color: var(--ink-62);
  transition: color .18s ease, border-color .18s ease;
}

.toc__link:hover { color: var(--c-cobalt); }

.toc__link.is-active {
  border-color: var(--c-turf);
  color: var(--c-lake);
  font-weight: 600;
}

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 17px;
  border-radius: 999px;
  background: var(--c-cobalt);
  color: #fff;
  font-size: 13.5px;
  font-weight: 600;
  box-shadow: 0 14px 34px rgba(6, 42, 51, .38);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .24s ease, transform .24s ease, visibility .24s, background .2s ease, color .2s ease;
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover { background: var(--c-turf); color: var(--c-turf-ink); }

/* ---------- 18. 滚动揭示 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .24s ease, transform .24s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 19. 响应式：头部与页脚 ---------- */
@media (max-width: 1180px) {
  .site-nav__link { font-size: 14.5px; }
  .site-nav__cta { padding: 10px 15px; font-size: 14px; }
}

@media (max-width: 979px) {
  .nav-toggle { display: inline-flex; }

  .header-ledger__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    padding-block: 9px;
  }

  .ledger-rhythm { white-space: normal; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 6px var(--pad) 22px;
    background: rgba(6, 42, 51, .98);
    border-bottom: 1px solid var(--c-hair);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height .3s ease, opacity .22s ease, visibility .22s ease;
  }

  .site-header[data-open] .site-nav {
    max-height: min(78vh, 560px);
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: 14px 4px;
    font-size: 17px;
    border-bottom: 1px solid rgba(30, 90, 102, .55);
  }

  .site-nav__link::after { display: none; }

  .site-nav__link[aria-current="page"] {
    padding-left: 16px;
    background: linear-gradient(90deg, rgba(57, 230, 122, .16), transparent 62%);
    border-bottom-color: rgba(57, 230, 122, .5);
  }

  .site-nav__cta {
    margin-top: 20px;
    width: 100%;
    justify-content: center;
    padding: 13px 20px;
  }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col--brand { grid-column: 1 / -1; max-width: none; }
}

@media (max-width: 640px) {
  .ledger-brand { font-size: 12px; }
  .ledger-rhythm { display: none; }

  .brand__mark { width: 30px; height: 30px; }
  .brand__name { font-size: 17px; }
  .brand__tag { display: none; }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .footer-slab { clip-path: polygon(0 4%, 100% 0, 100% 100%, 0 100%); }
  .footer-slab__inner { flex-direction: column; align-items: flex-start; }
  .footer-cta { width: 100%; }
  .footer-title { font-size: clamp(22px, 6vw, 30px); }

  .to-top { padding: 10px 14px; font-size: 13px; }
}

/* ---------- 20. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .site-header[data-scrolled] .header-ledger {
    max-height: 92px;
    opacity: 1;
  }
}