/* ==========================================================================
   PG游艺 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 按钮 / 容器 / 基础组件
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body {
  margin: 0;
  background: var(--ink-950);
  color: var(--text-dark-bg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, pre { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg { max-width: 100%; }
img { display: block; height: auto; }
a { color: inherit; }
button { font: inherit; color: inherit; }
table { border-collapse: collapse; border-spacing: 0; }
main { display: block; }

::selection { background: var(--amber-500); color: #14100B; }

:focus-visible {
  outline: 2px solid var(--amber-300);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(7, 20, 38, .55);
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink-950: #071426;
  --ink-900: #0A1B30;
  --ink-800: #0E2440;
  --ink-600: #1D3A5C;
  --paper-100: #F5EEDF;
  --paper-200: #E7DCC8;
  --amber-500: #FF8A1F;
  --amber-300: #FFB35C;
  --celadon-500: #56B79A;
  --celadon-100: #CDE9DF;
  --black-900: #211D19;

  --text-dark-bg: #EDE6D8;
  --text-dark-mute: rgba(233, 226, 214, .66);
  --text-dark-faint: rgba(233, 226, 214, .42);
  --text-paper: #211D19;
  --text-paper-mute: rgba(33, 29, 25, .68);

  --line-dark: rgba(245, 238, 223, .16);
  --line-dark-soft: rgba(245, 238, 223, .09);
  --line-paper: rgba(33, 29, 25, .16);

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: 1320px;
  --gutter: 28px;
  --cut: 22px;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 3. 排版阶梯 ---------- */
.t-display {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 6vw, 76px);
  line-height: 1.06;
  letter-spacing: .05em;
}

.t-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.18;
  letter-spacing: .04em;
}

.t-h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.35;
  letter-spacing: .03em;
}

.t-lead {
  font-size: clamp(17px, 1.5vw, 19px);
  line-height: 1.72;
  color: var(--text-dark-mute);
}

.t-mono {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
}

.t-index {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber-300);
  text-transform: uppercase;
}

/* ---------- 4. 布局容器 ---------- */
.shell {
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.section { padding: 76px 0; }
.section--tight { padding: 44px 0; }

.section--paper {
  background: var(--paper-100);
  color: var(--text-paper);
}

.grid { display: grid; gap: var(--grid-gap, 24px); }
.grid--cards { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.grid--index {
  display: grid;
  grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

.stack { display: grid; gap: var(--stack, 20px); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }

.on-paper {
  background: var(--paper-100);
  color: var(--text-paper);
}
.on-paper .t-lead,
.on-paper .figure__cap { color: var(--text-paper-mute); }
.on-paper .t-index { color: #A95200; }
.on-paper :focus-visible {
  outline-color: var(--ink-800);
  box-shadow: 0 0 0 4px rgba(245, 238, 223, .85);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}

.btn:focus-visible {
  outline: 2px solid var(--paper-100);
  outline-offset: -6px;
  box-shadow: none;
}

.btn--primary { background: var(--amber-500); color: #14100B; }
.btn--primary:hover { background: var(--amber-300); }

.btn--ghost {
  background: transparent;
  color: var(--paper-100);
  border-color: var(--line-dark);
}
.btn--ghost:hover { border-color: var(--amber-500); color: var(--amber-300); }

.btn--quiet {
  background: rgba(245, 238, 223, .09);
  color: var(--text-dark-bg);
}
.btn--quiet:hover { background: rgba(245, 238, 223, .16); }

.btn--sm { padding: 9px 15px; font-size: 13px; }
.btn--block { width: 100%; }

/* ---------- 6. 状态标签 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .1em;
  line-height: 1.6;
  text-transform: uppercase;
}

.chip--amber {
  border-color: rgba(255, 138, 31, .5);
  background: rgba(255, 138, 31, .12);
  color: var(--amber-300);
}

.chip--celadon {
  border-color: rgba(86, 183, 154, .5);
  background: rgba(86, 183, 154, .14);
  color: var(--celadon-500);
}

.chip--quiet {
  border-color: var(--line-dark);
  color: var(--text-dark-mute);
}

.on-paper .chip--amber { color: #A95200; background: rgba(255, 138, 31, .16); }
.on-paper .chip--celadon {
  color: #1E6B57;
  background: var(--celadon-100);
  border-color: rgba(30, 107, 87, .3);
}
.on-paper .chip--quiet { color: var(--text-paper-mute); border-color: var(--line-paper); }

/* ---------- 7. 面包屑 ---------- */
.crumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}
.crumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.crumbs li { display: inline-flex; align-items: center; gap: 8px; }
.crumbs li + li::before { content: "/"; color: var(--text-dark-faint); }
.crumbs a { color: var(--text-dark-mute); text-decoration: none; }
.crumbs a:hover { color: var(--amber-300); }
.crumbs [aria-current="page"] { color: var(--paper-100); }
.on-paper .crumbs a { color: var(--text-paper-mute); }
.on-paper .crumbs [aria-current="page"] { color: var(--text-paper); }

/* ---------- 8. 面板 ---------- */
.panel {
  position: relative;
  padding: 24px 26px;
  background: var(--ink-800);
  border: 1px solid var(--line-dark);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.panel--paper { background: var(--paper-100); color: var(--text-paper); border-color: var(--line-paper); }
.panel--flat { background: transparent; }
.panel--amber { border-color: rgba(255, 138, 31, .48); }

.panel__index {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--amber-300);
}

.panel__title {
  margin-bottom: 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .03em;
  line-height: 1.4;
}

.panel p { color: var(--text-dark-mute); font-size: 14.5px; }
.panel--paper p { color: var(--text-paper-mute); }
.panel--amber .panel__index { color: var(--amber-500); }

/* ---------- 9. 章节色带 ---------- */
.band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 20px;
  padding: 14px 0;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}
.band__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--amber-300);
}
.band__text { font-size: 14px; color: var(--text-dark-mute); }
.on-paper .band { border-color: var(--line-paper); }
.on-paper .band__num { color: #A95200; }
.on-paper .band__text { color: var(--text-paper-mute); }

/* ---------- 10. 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-dark);
  background: rgba(14, 36, 64, .4);
}

.table {
  width: 100%;
  min-width: 560px;
  font-size: 14px;
  line-height: 1.65;
}

.table th,
.table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-dark-soft);
}

.table thead th {
  background: rgba(29, 58, 92, .6);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-dark-mute);
  white-space: nowrap;
}

.table tbody tr:nth-child(even) { background: rgba(245, 238, 223, .04); }
.table tbody tr:last-child td { border-bottom: 0; }
.table .is-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}
.table td[data-state="ok"] { color: var(--celadon-500); }
.table td[data-state="warn"] { color: var(--amber-300); }

.on-paper .table-wrap { border-color: var(--line-paper); background: transparent; }
.on-paper .table thead th { background: var(--paper-200); color: var(--text-paper-mute); }
.on-paper .table th,
.on-paper .table td { border-bottom-color: var(--line-paper); }
.on-paper .table tbody tr:nth-child(even) { background: rgba(33, 29, 25, .05); }
.on-paper .table td[data-state="ok"] { color: #1E6B57; }
.on-paper .table td[data-state="warn"] { color: #A95200; }

/* ---------- 11. 折叠细则 ---------- */
.fold { border-bottom: 1px solid var(--line-dark); }

.fold__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 2px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .02em;
  cursor: pointer;
  list-style: none;
}
.fold__summary::-webkit-details-marker { display: none; }
.fold__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--amber-500);
  transition: transform .18s var(--ease);
}
.fold[open] .fold__summary::after { transform: rotate(45deg); }
.fold__body {
  max-width: 68ch;
  padding: 0 2px 20px;
  font-size: 15px;
  color: var(--text-dark-mute);
}
.fold__body p + p { margin-top: .8em; }
.on-paper .fold { border-bottom-color: var(--line-paper); }
.on-paper .fold__body { color: var(--text-paper-mute); }

/* ---------- 12. 图片容器基础规则 ---------- */
.figure { display: grid; gap: 12px; margin: 0; }

.figure__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--ink-800);
  border: 1px solid var(--line-dark);
}
.figure__frame > img,
.figure__frame > svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure__frame--wide { aspect-ratio: 21 / 9; }
.figure__frame--tall { aspect-ratio: 4 / 5; }
.figure__frame--paper { background: var(--paper-200); border-color: var(--line-paper); }

.figure__frame--wire {
  background-image:
    repeating-linear-gradient(0deg, rgba(86, 183, 154, .18) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(86, 183, 154, .18) 0 1px, transparent 1px 48px);
}

.figure__tag {
  position: absolute;
  top: 0;
  left: 0;
  padding: 6px 10px;
  background: var(--amber-500);
  color: #14100B;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.figure__cap {
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dark-mute);
}

.figure-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

/* ---------- 13. 长文 ---------- */
.prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.8;
}
.prose > * + * { margin-top: 1em; }
.prose h2 {
  margin-top: 2em;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 800;
  letter-spacing: .03em;
  line-height: 1.3;
}
.prose h3 {
  margin-top: 1.6em;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .02em;
}
.prose ul { display: grid; gap: .5em; }
.prose li { position: relative; padding-left: 1.2em; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 7px;
  height: 1px;
  background: var(--amber-500);
}
.prose strong { color: var(--paper-100); font-weight: 700; }
.on-paper .prose strong { color: var(--ink-950); }
.prose a { text-decoration: none; border-bottom: 1px solid var(--amber-500); }
.prose a:hover { color: var(--amber-300); }

/* ---------- 14. 章节索引（页面级） ---------- */
.rail {
  position: sticky;
  top: 108px;
  display: grid;
  gap: 2px;
  align-content: start;
}

.rail__title {
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--text-dark-faint);
  text-transform: uppercase;
}

.rail__link {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--text-dark-mute);
  text-decoration: none;
  transition: color .16s var(--ease), background-color .16s var(--ease), border-color .16s var(--ease);
}
.rail__link:hover { color: var(--paper-100); background: rgba(245, 238, 223, .06); }
.rail__link[data-active="true"] {
  color: var(--paper-100);
  border-left-color: var(--amber-500);
  background: rgba(245, 238, 223, .08);
}
.rail__num { font-size: 11px; color: var(--amber-300); }
.rail__link[data-active="true"] .rail__num { color: var(--celadon-500); }
.on-paper .rail__link { color: var(--text-paper-mute); }
.on-paper .rail__link[data-active="true"] { color: var(--text-paper); background: rgba(33, 29, 25, .07); }

/* ---------- 15. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -72px;
  left: 16px;
  z-index: 2000;
  padding: 12px 18px;
  background: var(--amber-500);
  color: #14100B;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 16. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  color: var(--text-dark-bg);
  background: linear-gradient(180deg, rgba(7, 20, 38, .95) 0%, rgba(7, 20, 38, .74) 62%, rgba(7, 20, 38, .46) 100%);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: background-color .24s var(--ease), box-shadow .24s var(--ease);
}

.site-header[data-scrolled] {
  background: rgba(7, 20, 38, .98);
  box-shadow: 0 1px 0 rgba(255, 138, 31, .38), 0 22px 44px -30px rgba(0, 0, 0, .95);
}

.header-strip {
  max-height: 48px;
  overflow: hidden;
  border-bottom: 1px solid var(--line-dark-soft);
  transition: max-height .24s var(--ease), opacity .24s var(--ease), border-color .24s var(--ease);
}

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

.header-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 42px;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.header-strip__note {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--text-dark-mute);
  white-space: nowrap;
}

.header-strip__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--celadon-500);
  box-shadow: 0 0 0 3px rgba(86, 183, 154, .18);
}

.header-strip__links { display: flex; align-items: center; gap: 6px; }

.header-strip__link {
  display: inline-block;
  padding: 4px 8px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--text-dark-mute);
  text-decoration: none;
  transition: color .16s var(--ease);
}
.header-strip__link:hover { color: var(--amber-300); }

.header-bar__inner {
  display: flex;
  align-items: center;
  gap: 26px;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 12px var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper-100);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  background: var(--amber-500);
  color: #0B1524;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .04em;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.brand__text { display: flex; flex-direction: column; line-height: 1.18; }

.brand__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .07em;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--text-dark-faint);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.site-nav__list { display: flex; align-items: center; gap: 2px; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 11px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--text-dark-mute);
  text-decoration: none;
  transition: color .16s var(--ease), background-color .16s var(--ease);
}

.site-nav__link::before {
  content: attr(data-num);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .06em;
  color: rgba(255, 179, 92, .66);
}

.site-nav__link:hover { color: var(--paper-100); background: rgba(245, 238, 223, .07); }

.site-nav__link[aria-current="page"] { color: var(--paper-100); }
.site-nav__link[aria-current="page"]::before { color: var(--celadon-500); }
.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 3px;
  height: 2px;
  background: var(--amber-500);
}

.site-nav__foot { display: none; }

.site-nav__hint {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--text-dark-faint);
}

.header-actions { display: flex; align-items: center; gap: 10px; }

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--amber-500);
  color: #14100B;
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .06em;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background-color .16s var(--ease);
}
.header-cta:hover { background: var(--amber-300); }
.header-cta:focus-visible { outline: 2px solid #14100B; outline-offset: -6px; box-shadow: none; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(245, 238, 223, .06);
  border: 1px solid rgba(245, 238, 223, .28);
  color: var(--paper-100);
  font-size: 12.5px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: border-color .16s var(--ease), background-color .16s var(--ease);
}
.nav-toggle:hover { border-color: var(--amber-500); }

.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bars > span {
  display: block;
  height: 2px;
  background: var(--amber-500);
  transition: transform .18s var(--ease), opacity .18s var(--ease), width .18s var(--ease);
}
.nav-toggle__bars > span:nth-child(3) { width: 12px; }

.nav-toggle[aria-expanded="true"] {
  border-color: var(--amber-500);
  background: rgba(255, 138, 31, .14);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(3) { width: 18px; transform: translateY(-6px) rotate(-45deg); }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(245, 238, 223, .14);
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--celadon-500);
  transition: width .12s linear;
}

/* ---------- 17. 页脚 ---------- */
.site-footer {
  background: var(--ink-950);
  color: var(--text-dark-mute);
  border-top: 1px solid var(--line-dark);
}

.footer-main {
  position: relative;
  padding: 88px 0 48px;
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  clip-path: polygon(0 46px, 100% 0, 100% 100%, 0 100%);
}

.footer-main__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 2fr);
  gap: 48px 56px;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.brand--footer { margin-bottom: 16px; }

.footer-brand__line {
  max-width: 26em;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dark-mute);
}

.footer-contact { display: grid; gap: 10px; margin-top: 24px; }

.footer-contact__row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding-top: 10px;
  border-top: 1px solid var(--line-dark-soft);
}
.footer-contact__row:first-child { padding-top: 0; border-top: 0; }

.footer-contact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--celadon-500);
  padding-top: 3px;
}

.footer-contact dd {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--text-dark-bg);
  word-break: break-word;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 34px 24px;
}

.footer-col__title {
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--amber-300);
}

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

.footer-col__link {
  display: inline-block;
  font-size: 14px;
  color: var(--text-dark-mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.footer-col__link:hover { color: var(--paper-100); border-bottom-color: var(--amber-500); }

.footer-bottom { padding: 20px 0 28px; background: var(--ink-950); }

.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--text-dark-faint);
}

.footer-bottom__link { color: var(--amber-300); text-decoration: none; }
.footer-bottom__link:hover { color: var(--paper-100); }

/* ---------- 18. 显现动效 ---------- */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .26s var(--ease), transform .26s var(--ease);
}
html.has-js [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1080px) {
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    margin-left: 0;
    padding: 10px 0 22px;
    background: var(--ink-950);
    border-top: 1px solid var(--line-dark);
    border-bottom: 1px solid rgba(255, 138, 31, .32);
    box-shadow: 0 34px 60px -34px rgba(0, 0, 0, .95);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }

  .site-nav[data-open] { display: block; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0 var(--gutter);
  }

  .site-nav__link {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 2px;
    font-size: 16px;
    border-bottom: 1px solid var(--line-dark-soft);
  }

  .site-nav__link::before { width: 26px; flex: none; font-size: 11px; }

  .site-nav__link[aria-current="page"]::after {
    left: 0;
    right: auto;
    top: 50%;
    bottom: auto;
    width: 3px;
    height: 20px;
    transform: translateY(-50%);
  }

  .site-nav__foot { display: grid; gap: 10px; padding: 18px var(--gutter) 0; }

  .nav-toggle { display: inline-flex; }
  .header-cta { display: none; }
  .header-bar__inner { gap: 16px; }

  .grid--index { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .rail { position: static; display: flex; flex-wrap: wrap; gap: 4px; }
  .rail__title { width: 100%; }
  .rail__link { border-left: 0; border-bottom: 2px solid transparent; padding: 6px 10px; }
  .rail__link[data-active="true"] { border-left: 0; border-bottom-color: var(--amber-500); }

  .footer-main__inner { grid-template-columns: minmax(0, 1fr); gap: 36px; }
}

@media (max-width: 820px) {
  :root { --gutter: 20px; }
  .section { padding: 56px 0; }
  .section--tight { padding: 34px 0; }
  .header-strip__note { letter-spacing: .1em; }
  .footer-main { padding: 72px 0 40px; clip-path: polygon(0 32px, 100% 0, 100% 100%, 0 100%); }
}

@media (max-width: 620px) {
  :root { --gutter: 16px; --cut: 16px; }
  body { font-size: 15.5px; }
  .header-strip__links { gap: 0; }
  .header-strip__note { font-size: 10.5px; letter-spacing: .08em; }
  .brand__mark { width: 38px; height: 38px; font-size: 14px; }
  .brand__name { font-size: 15.5px; }
  .brand__sub { font-size: 9.5px; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 18px; }
  .footer-contact__row { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .footer-contact dt { color: var(--celadon-500); }
  .footer-bottom__inner { justify-content: flex-start; }
  .panel { padding: 20px 18px; }
}

/* ---------- 20. 降低动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  html.has-js [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress__bar { transition: none; }
}