/* ==========================================================================
   九五至尊3 · 共享外壳样式 /assets/site.css
   规格对照手册视觉体系：深墨岩 · 夜幕琥珀 · 深琥珀 · 沙金 · 沙纸白 · 冷调青灰
   ========================================================================== */

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

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

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

ul, ol { padding: 0; list-style: none; }

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

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

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

table { border-collapse: collapse; border-spacing: 0; }

address { font-style: normal; }

:focus-visible {
  outline: 2px solid #EBC77E;
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 品牌色板 */
  --c-ink: #16110D;
  --c-night: #2A1F16;
  --c-amber: #7A4E18;
  --c-sand: #C8912F;
  --c-sand-lt: #EBC77E;
  --c-paper: #F5F1E8;
  --c-steel: #33454E;
  --c-steel-lt: #7E8F97;
  --c-cinnabar: #C4341C;
  --c-mist: #E2D9C8;

  /* 结构 */
  --shell: 1320px;
  --shell-narrow: 880px;
  --gutter: clamp(18px, 4vw, 56px);
  --header-h: 76px;
  --nav-break: 1080px;

  --r-lg: 28px;
  --r-md: 18px;
  --r-sm: 12px;
  --r-pill: 999px;

  --line-ink: rgba(51, 69, 78, 0.2);
  --line-gold: rgba(200, 145, 47, 0.32);
  --line-light: rgba(245, 241, 232, 0.16);

  --shadow-plate: 0 22px 46px -34px rgba(22, 17, 13, 0.6);
  --shadow-float: 0 18px 38px -22px rgba(22, 17, 13, 0.85);

  /* 字体 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", Georgia, "Times New Roman", serif;
  --font-num: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  /* 动效 */
  --t-fast: 180ms;
  --t-base: 320ms;
  --ease: cubic-bezier(0.22, 0.68, 0.32, 1);
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 0.01em;
  color: var(--c-ink);
  background-color: var(--c-paper);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.prose { max-width: 42em; }
.prose > * + * { margin-top: 1.05em; }
.prose h2,
.prose h3 { margin-top: 1.9em; }

.lede {
  font-size: clamp(17px, 1.5vw, 19.5px);
  line-height: 1.75;
  color: var(--c-steel);
  max-width: 36em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-steel-lt);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-sand);
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: inherit;
}

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--c-sand), rgba(200, 145, 47, 0.05));
}

/* ---------- 4. 跳过链接 ---------- */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -120px;
  z-index: 140;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  background: var(--c-sand);
  color: var(--c-ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: top var(--t-fast) var(--ease);
}

.skip-link:focus {
  top: 12px;
  outline-color: var(--c-ink);
}

/* ---------- 5. 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  color: var(--c-paper);
  background: linear-gradient(180deg, rgba(22, 17, 13, 0.78), rgba(22, 17, 13, 0));
  transition: background var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}

.site-header.is-solid,
.site-header.is-nav-open {
  background: linear-gradient(180deg, rgba(122, 78, 24, 0.985), rgba(122, 78, 24, 0.92));
  box-shadow: 0 1px 0 rgba(235, 199, 126, 0.3), 0 16px 36px -28px rgba(22, 17, 13, 0.95);
}

.site-header__inner {
  position: relative;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  min-height: var(--header-h);
  padding: 14px var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
}

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

.site-header__brand::before {
  content: "";
  width: 4px;
  height: 36px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--c-sand-lt), var(--c-amber));
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand__mark {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--c-paper);
}

.brand__line {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--c-sand-lt);
  opacity: 0.92;
}

.site-header__chapter {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-sand-lt);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}

.site-header.is-solid .site-header__chapter,
.site-header.is-nav-open .site-header__chapter {
  opacity: 1;
  transform: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 24px);
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 20px);
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: rgba(245, 241, 232, 0.86);
  transition: color var(--t-fast) var(--ease);
}

.site-nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 18px;
  transform: translateY(-50%);
  border-radius: 2px;
  background: var(--c-cinnabar);
  transition: width var(--t-fast) var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-sand-lt);
  transition: right var(--t-base) var(--ease);
}

.site-nav__link:hover { color: #FFFFFF; }
.site-nav__link:hover::after { right: 0; }

.site-nav__link[aria-current="page"] { color: var(--c-sand-lt); }
.site-nav__link[aria-current="page"]::after { right: 0; }

.site-nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: clamp(8px, 1.2vw, 18px);
  border-left: 1px solid rgba(235, 199, 126, 0.3);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 42px;
  padding: 9px 18px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(235, 199, 126, 0.46);
  background: rgba(22, 17, 13, 0.4);
  color: var(--c-sand-lt);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.nav-toggle:hover { background: rgba(200, 145, 47, 0.22); }

.nav-toggle__bars {
  position: relative;
  width: 16px;
  height: 10px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.6px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--t-base) var(--ease), top var(--t-base) var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 8px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 4px; transform: rotate(-45deg); }

.nav-toggle__text { line-height: 1; }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-amber), var(--c-sand) 55%, var(--c-sand-lt));
  pointer-events: none;
}

/* ---------- 6. 胶囊按钮 ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 9px 20px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.2;
  white-space: nowrap;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.pill--lg { min-height: 48px; padding: 13px 28px; font-size: 15px; }

.pill--ghost {
  border-color: rgba(235, 199, 126, 0.5);
  background: rgba(22, 17, 13, 0.34);
  color: var(--c-sand-lt);
}
.pill--ghost:hover {
  background: rgba(200, 145, 47, 0.2);
  border-color: var(--c-sand-lt);
  color: #FFFFFF;
}

.pill--gold { background: var(--c-sand); color: var(--c-ink); }
.pill--gold:hover { background: var(--c-sand-lt); }

.pill--ink { background: var(--c-ink); color: var(--c-paper); }
.pill--ink:hover { background: var(--c-amber); }

.pill--amber { background: var(--c-amber); color: var(--c-paper); }
.pill--amber:hover { background: var(--c-ink); }

.pill--outline { border-color: var(--c-steel); color: var(--c-ink); }
.pill--outline:hover { border-color: var(--c-sand); background: rgba(200, 145, 47, 0.1); }

.pill--cinnabar { background: var(--c-cinnabar); color: #FFFFFF; }
.pill--cinnabar:hover { background: #A82A14; }

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--c-ink);
  color: var(--c-paper);
  margin-top: clamp(48px, 7vw, 110px);
}

.site-footer__band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 28px;
  padding-block: 20px;
  border-bottom: 1px solid var(--line-gold);
}

.site-footer__version {
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--c-sand-lt);
  white-space: nowrap;
}

.site-footer__bar {
  flex: 1 1 60px;
  height: 1px;
  background: linear-gradient(90deg, var(--c-sand), rgba(200, 145, 47, 0));
}

.site-footer__sync {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: rgba(245, 241, 232, 0.6);
}

.site-footer__main {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.3fr);
  gap: clamp(28px, 4vw, 64px);
  padding-block: clamp(38px, 5vw, 72px);
}

.site-footer__brand { min-width: 0; }

.site-footer__mark {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--c-paper);
}

.site-footer__mark::after {
  content: "";
  display: block;
  width: 46px;
  height: 3px;
  margin-top: 12px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-sand-lt), var(--c-amber));
}

.site-footer__tag {
  margin-top: 14px;
  max-width: 24em;
  font-size: 13.5px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.62);
}

.site-footer__col { min-width: 0; }

.site-footer__heading {
  margin-bottom: 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-sand);
}

.site-footer__list li + li { margin-top: 11px; }

.site-footer__list a {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14.5px;
  color: rgba(245, 241, 232, 0.82);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.site-footer__list a:hover {
  color: var(--c-sand-lt);
  border-color: var(--c-sand-lt);
}

.site-footer__lines li {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 241, 232, 0.76);
}

.site-footer__lines li + li { margin-top: 11px; }

.site-footer__lines a {
  color: var(--c-sand-lt);
  border-bottom: 1px solid rgba(235, 199, 126, 0.4);
  transition: border-color var(--t-fast) var(--ease);
}

.site-footer__lines a:hover { border-color: var(--c-sand-lt); }

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 26px;
  padding-block: 22px 30px;
  border-top: 1px solid var(--line-light);
}

.site-footer__icp {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: rgba(245, 241, 232, 0.55);
}

.site-footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.site-footer__legal-links a {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: rgba(245, 241, 232, 0.62);
  transition: color var(--t-fast) var(--ease);
}

.site-footer__legal-links a:hover { color: var(--c-sand-lt); }

/* ---------- 8. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 34px);
  bottom: clamp(14px, 3vw, 34px);
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: var(--r-pill);
  background: var(--c-sand);
  color: var(--c-ink);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  box-shadow: var(--shadow-float);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease),
              visibility var(--t-base), background var(--t-fast) var(--ease);
}

.to-top::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 2px;
  border-left: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: rotate(45deg);
}

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

.to-top:hover { background: var(--c-sand-lt); }

/* ---------- 9. 容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: var(--shell-narrow); }

.section { padding-block: clamp(56px, 8vw, 120px); }
.section--tight { padding-block: clamp(34px, 5vw, 64px); }

.section--ink { background: var(--c-ink); color: var(--c-paper); }
.section--night { background: var(--c-night); color: var(--c-paper); }
.section--mist { background: var(--c-mist); }

.section--ink .lede,
.section--night .lede { color: rgba(245, 241, 232, 0.74); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(24px, 3.2vw, 44px);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}

.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--asym { grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 10. 铭牌块 ---------- */
.plate {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  border-radius: var(--r-lg);
  background: var(--c-mist);
  border: 1px solid var(--line-ink);
  box-shadow: var(--shadow-plate);
}

.plate--ink {
  background: var(--c-ink);
  color: var(--c-paper);
  border-color: var(--line-gold);
}

.plate--night {
  background: var(--c-night);
  color: var(--c-paper);
  border-color: var(--line-gold);
}

.plate--outline {
  background: transparent;
  box-shadow: none;
}

.plate__index {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(26px, 3.6vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-sand);
  font-variant-numeric: tabular-nums;
}

.plate__title {
  margin-top: 12px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.plate__text {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-steel);
}

.plate--ink .plate__text,
.plate--night .plate__text { color: rgba(245, 241, 232, 0.72); }

/* ---------- 11. 参数矩阵 ---------- */
.matrix-wrap {
  overflow-x: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--line-ink);
  background: rgba(255, 255, 255, 0.72);
}

.matrix {
  width: 100%;
  min-width: 640px;
  font-size: 14px;
}

.matrix th,
.matrix td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-ink);
}

.matrix thead th {
  position: sticky;
  top: 0;
  background: var(--c-steel);
  color: var(--c-paper);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

.matrix tbody tr:nth-child(even) { background: rgba(226, 217, 200, 0.42); }
.matrix tbody tr:last-child th,
.matrix tbody tr:last-child td { border-bottom: 0; }

.matrix [data-matrix-col] { transition: opacity var(--t-fast) var(--ease); }
.matrix.is-focus [data-matrix-col]:not(.is-active) { opacity: 0.36; }

/* ---------- 12. 横向滚动带 ---------- */
.rail-wrap { position: relative; }

.rail-wrap::before,
.rail-wrap::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 22px;
  width: 46px;
  z-index: 2;
  pointer-events: none;
}

.rail-wrap::before {
  left: 0;
  background: linear-gradient(90deg, var(--c-paper), rgba(245, 241, 232, 0));
}

.rail-wrap::after {
  right: 0;
  background: linear-gradient(270deg, var(--c-paper), rgba(245, 241, 232, 0));
}

.rail-wrap--on-ink::before {
  background: linear-gradient(90deg, var(--c-ink), rgba(22, 17, 13, 0));
}

.rail-wrap--on-ink::after {
  background: linear-gradient(270deg, var(--c-ink), rgba(22, 17, 13, 0));
}

.rail {
  display: flex;
  gap: clamp(14px, 1.8vw, 22px);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  padding: 6px var(--gutter) 22px;
  scrollbar-width: thin;
  scrollbar-color: rgba(200, 145, 47, 0.55) transparent;
}

.rail > * {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.rail::-webkit-scrollbar { height: 6px; }
.rail::-webkit-scrollbar-thumb { background: rgba(200, 145, 47, 0.5); border-radius: 99px; }
.rail::-webkit-scrollbar-track { background: rgba(51, 69, 78, 0.08); }

/* ---------- 13. 响应式图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-gold);
  background: linear-gradient(145deg, var(--c-night) 0%, var(--c-ink) 52%, var(--c-amber) 132%);
}

.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--3x4 { aspect-ratio: 3 / 4; }
.media--21x9 { aspect-ratio: 21 / 9; }

.media--tint::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(22, 17, 13, 0) 38%, rgba(22, 17, 13, 0.64) 100%);
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 18px 22px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: rgba(245, 241, 232, 0.9);
}

.media--fallback::before {
  content: attr(data-note);
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 22px;
  z-index: 1;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: rgba(235, 199, 126, 0.78);
}

/* ---------- 14. 标签 / 筛选 / 清单 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-gold);
  background: rgba(200, 145, 47, 0.08);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-amber);
}

.tag--cinnabar {
  border-color: rgba(196, 52, 28, 0.4);
  background: rgba(196, 52, 28, 0.07);
  color: var(--c-cinnabar);
}

.tag--on-ink {
  border-color: rgba(235, 199, 126, 0.4);
  background: rgba(235, 199, 126, 0.08);
  color: var(--c-sand-lt);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 7px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-ink);
  background: transparent;
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: var(--c-steel);
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
}

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

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

.checklist {
  display: grid;
  gap: 10px;
}

.checklist__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-ink);
  background: rgba(255, 255, 255, 0.6);
  font-size: 14.5px;
  line-height: 1.7;
}

.checklist__item.is-done {
  border-color: var(--c-sand);
  background: rgba(200, 145, 47, 0.1);
}

.checklist__box {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  border-radius: 6px;
  border: 1.5px solid var(--c-steel-lt);
}

.checklist__item.is-done .checklist__box {
  background: var(--c-sand);
  border-color: var(--c-sand);
}

.checklist__item.is-done .checklist__box::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border-right: 2px solid var(--c-ink);
  border-bottom: 2px solid var(--c-ink);
  transform: rotate(42deg);
}

/* ---------- 15. 时间轴 / 统计 / 面包屑 ---------- */
.timeline {
  position: relative;
  padding-left: 26px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-sand), rgba(200, 145, 47, 0.08));
}

.timeline__item {
  position: relative;
  padding-bottom: 26px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-paper);
  border: 2px solid var(--c-sand);
}

.timeline__title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.timeline__meta {
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--c-steel-lt);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat__num {
  font-family: var(--font-num);
  font-size: clamp(30px, 4.4vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-sand);
  font-variant-numeric: tabular-nums;
}

.stat__label {
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--c-steel-lt);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--c-steel-lt);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(126, 143, 151, 0.6);
}

.breadcrumb a { transition: color var(--t-fast) var(--ease); }
.breadcrumb a:hover { color: var(--c-sand); }

/* ---------- 16. 渐显 ---------- */
[data-reveal].is-armed {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}

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

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }

  .site-header__chapter { display: none; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h);
    z-index: 85;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 12px var(--gutter) 28px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: var(--c-ink);
    border-top: 1px solid rgba(200, 145, 47, 0.32);
    border-bottom: 1px solid rgba(200, 145, 47, 0.2);
    transform: translateY(-14px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease),
                visibility var(--t-base);
  }

  .site-nav[data-open] {
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

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

  .site-nav__list li + li { border-top: 1px solid rgba(235, 199, 126, 0.12); }

  .site-nav__link {
    display: block;
    padding: 15px 2px;
    font-size: 17px;
    color: rgba(245, 241, 232, 0.9);
  }

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

  .site-nav__link[aria-current="page"] {
    padding-left: 14px;
    color: var(--c-sand-lt);
  }

  .site-nav__link[aria-current="page"]::before { width: 4px; }

  .site-nav__actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-top: 20px;
    padding: 18px 0 0;
    border-left: 0;
    border-top: 1px solid rgba(235, 199, 126, 0.2);
  }

  .site-nav__actions .pill { width: 100%; }
}

@media (max-width: 900px) {
  .grid--split,
  .grid--asym,
  .grid--halves,
  .grid--thirds { grid-template-columns: minmax(0, 1fr); }

  .site-footer__main { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  body { font-size: 15.5px; }

  .site-header__inner { padding-block: 11px; }

  .site-footer__main { grid-template-columns: minmax(0, 1fr); }

  .site-footer__legal { padding-block: 20px 34px; }

  .matrix { min-width: 560px; }

  .to-top { padding: 10px 18px; font-size: 13px; }
}

@media (max-width: 460px) {
  .brand__line { font-size: 10.5px; letter-spacing: 0.1em; }
  .nav-toggle__text { display: none; }
  .rail-wrap::before,
  .rail-wrap::after { width: 26px; }
}

/* ---------- 18. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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