/* ==========================================================================
   新豪门娱乐站 — 共享样式 /assets/site.css
   深夜数据舱 × 复古印刷叠纸
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --ink-950: #08131F;
  --ink-900: #0B1B2B;
  --ink-800: #14304A;
  --cream-50: #F3ECE0;
  --cream-100: #E3D9C6;
  --brown-900: #241C14;
  --brown-500: #6E6252;
  --cyan-400: #35E0D2;
  --cyan-700: #147F82;
  --amber-400: #F2A94B;
  --amber-600: #B96E22;
  --ember-500: #C4472A;

  --line-dark: rgba(243, 236, 224, .14);
  --line-dark-strong: rgba(243, 236, 224, .32);
  --line-print: rgba(36, 28, 20, .22);
  --scrim: rgba(8, 19, 31, .76);
  --text-dim: rgba(243, 236, 224, .62);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Menlo, Consolas, monospace;

  --ease: cubic-bezier(.2, .7, .3, 1);
  --r-sm: 2px;
  --r-md: 10px;

  --gut: clamp(16px, 4vw, 44px);
  --shell: 1180px;
}

/* ---------- 2. reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: var(--ink-950);
  color: var(--cream-50);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.85;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { max-width: 100%; }
button { font: inherit; color: inherit; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}
.paper :focus-visible { outline-color: var(--ember-500); }

/* ---------- 3. 排版 ---------- */
.num,
.metric-value,
[data-number] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .06em;
}

.label {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.note,
.annotation {
  font-size: 13px;
  font-weight: 300;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--text-dim);
}

.lede {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.75;
  color: rgba(243, 236, 224, .86);
}

.term {
  border-bottom: 1px dashed var(--amber-600);
  cursor: help;
}

.prose { max-width: 68ch; }
.prose p { margin-bottom: 1.05em; }
.prose h2,
.prose h3 { margin: 1.6em 0 .55em; font-weight: 500; }
.prose ul,
.prose ol { margin: 0 0 1.1em 1.1em; list-style: disc; }
.prose li { margin-bottom: .4em; }

/* ---------- 4. 容器与节奏 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.band { width: 100%; padding-block: clamp(44px, 7vw, 96px); }
.band--ink-900 { background: var(--ink-900); }
.band--ink-800 { background: var(--ink-800); }

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line-dark);
}

.chapter { padding-block: clamp(48px, 8vw, 112px); }

.chapter-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(14px, 3vw, 34px);
  align-items: start;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-dark);
  margin-bottom: clamp(24px, 4vw, 46px);
}

.chapter-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .18em;
  line-height: 2.4;
  color: rgba(243, 236, 224, .26);
  transition: color .24s var(--ease);
}
.chapter.is-inview .chapter-num,
.chapter:hover .chapter-num { color: var(--cyan-400); }

.chapter-title {
  font-size: clamp(34px, 6vw, 76px);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--cream-50);
}

.chapter-note {
  margin-top: 12px;
  font-size: 13px;
  font-weight: 300;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--text-dim);
}

/* ---------- 5. 网格 ---------- */
.grid-2 {
  display: grid;
  gap: clamp(20px, 3vw, 42px);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.asym {
  display: grid;
  gap: clamp(20px, 3.4vw, 52px);
  grid-template-columns: minmax(0, 62fr) minmax(0, 34fr);
  align-items: start;
}

.aside-rail {
  border-left: 2px solid var(--cyan-700);
  padding-left: clamp(14px, 2vw, 22px);
}

/* ---------- 6. 纸面 ---------- */
.paper {
  position: relative;
  background: var(--cream-50);
  color: var(--brown-900);
  border: 1px solid var(--line-print);
  border-radius: var(--r-sm);
  padding: clamp(20px, 3vw, 40px);
  box-shadow: 4px 4px 0 rgba(227, 217, 198, .10);
}
.paper .label { color: var(--ember-500); }
.paper .note,
.paper .annotation { color: var(--brown-500); }
.paper .lede { color: var(--brown-900); }
.paper .term { border-bottom-color: var(--amber-600); }

.paper-stack { position: relative; }
.paper-stack::before {
  content: "";
  position: absolute;
  inset: 6px -6px -6px 6px;
  background: var(--cream-100);
  border: 1px solid var(--line-print);
  border-radius: var(--r-sm);
  z-index: -1;
  transition: transform .16s var(--ease);
}
.paper-stack:hover::before { transform: translate(2px, 2px); }

/* ---------- 7. 标签与按钮 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  letter-spacing: .16em;
  line-height: 1;
  padding: 6px 10px;
  border: 1px solid var(--line-dark-strong);
  border-radius: var(--r-sm);
  color: var(--text-dim);
}
.tag-cyan { color: var(--cyan-400); border-color: rgba(53, 224, 210, .42); }
.tag-amber { color: var(--amber-400); border-color: rgba(242, 169, 75, .42); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-size: 14px;
  letter-spacing: .08em;
  text-decoration: none;
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}
.btn-cyan { background: var(--cyan-400); color: var(--ink-950); font-weight: 500; }
.btn-cyan:hover { background: #5ff0e3; transform: translateY(-2px); }
.btn-amber { background: var(--amber-400); color: var(--ink-950); font-weight: 500; }
.btn-amber:hover { background: #ffc06a; transform: translateY(-2px); }
.btn-ghost { background: transparent; border-color: var(--line-dark-strong); color: var(--cream-50); }
.btn-ghost:hover { border-color: var(--amber-400); color: var(--amber-400); }

.link-plain {
  position: relative;
  display: inline-block;
  text-decoration: none;
  color: var(--cream-50);
}
.link-plain::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--amber-400);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}
.link-plain:hover::after,
.link-plain:focus-visible::after { transform: scaleX(1); }

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--text-dim);
  padding-block: 16px;
}
.breadcrumb a { text-decoration: none; color: var(--text-dim); transition: color .18s var(--ease); }
.breadcrumb a:hover { color: var(--cyan-400); }
.breadcrumb li::after { content: "／"; margin-left: 8px; color: rgba(243, 236, 224, .28); }
.breadcrumb li:last-child::after { content: ""; }

/* ---------- 9. 数据带与指标 ---------- */
.data-band {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding-block: 18px 24px;
  padding-inline: var(--gut);
  margin-inline: calc(var(--gut) * -1);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.data-band::-webkit-scrollbar { height: 6px; }
.data-band::-webkit-scrollbar-track { background: rgba(243, 236, 224, .07); }
.data-band::-webkit-scrollbar-thumb { background: var(--cyan-700); border-radius: 3px; }

.data-cell {
  flex: 0 0 clamp(180px, 24vw, 256px);
  scroll-snap-align: start;
  border-left: 2px solid var(--cyan-700);
  padding-left: 14px;
}
.data-cell[data-tone="amber"] { border-left-color: var(--amber-600); }
.data-cell .data-key {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--text-dim);
}
.data-cell .data-val {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  letter-spacing: .06em;
  color: var(--cyan-400);
}
.data-cell[data-tone="amber"] .data-val { color: var(--amber-400); }

.metric { display: block; }
.metric-value {
  display: block;
  font-size: clamp(48px, 9vw, 132px);
  font-weight: 500;
  line-height: .94;
  letter-spacing: .02em;
  color: var(--cyan-400);
}
.metric-value.is-amber { color: var(--amber-400); }
.metric-note {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  font-weight: 300;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--text-dim);
}

/* ---------- 10. 表格 ---------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
.spec-table caption {
  text-align: left;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--brown-500);
  padding-bottom: 10px;
}
.spec-table th,
.spec-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-print);
  transition: box-shadow .16s var(--ease), background .16s var(--ease);
}
.spec-table thead th {
  background: var(--cream-100);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
}
.spec-table tbody tr:hover th,
.spec-table tbody tr:hover td,
.spec-table tbody tr:focus-within th,
.spec-table tbody tr:focus-within td {
  background: rgba(227, 217, 198, .5);
  box-shadow: inset 0 1px 0 var(--cyan-700), inset 0 -1px 0 var(--cyan-700);
}
.spec-table td .num { font-size: 15px; }

/* ---------- 11. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--line-dark);
  border-radius: var(--r-md);
}
.media-frame img,
.media-frame > svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.9) contrast(1.06) brightness(.94);
  transition: transform .32s var(--ease);
}
.media-frame:hover img { transform: scale(1.015); }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(8, 19, 31, 0) 55%, rgba(8, 19, 31, .55) 100%),
    repeating-linear-gradient(180deg, rgba(53, 224, 210, .05) 0 1px, transparent 1px 4px);
}
.media-ratio-wide { aspect-ratio: 16 / 9; }
.media-ratio-tall { aspect-ratio: 3 / 4; }
.media-ratio-sq { aspect-ratio: 1 / 1; }
.media-caption {
  margin-top: 10px;
  font-size: 13px;
  font-weight: 300;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--text-dim);
}

/* ---------- 12. 显现动效 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity .5s var(--ease), transform .5s var(--ease);
  }
  .js [data-reveal].is-inview {
    opacity: 1;
    transform: none;
  }
}

/* ==========================================================================
   13. 页头
   ========================================================================== */
.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  z-index: 200;
  transform: translate(-50%, -160%);
  background: var(--cyan-400);
  color: var(--ink-950);
  padding: 10px 20px;
  font-size: 13px;
  letter-spacing: .08em;
  text-decoration: none;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink-950);
  color: var(--cream-50);
  border-bottom: 1px solid var(--line-dark);
}

.header-inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gut);
}

/* 刊头 */
.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: baseline;
  gap: 16px;
  padding-block: 18px 12px;
  border-bottom: 1px solid var(--line-dark);
}

.masthead-kicker {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--text-dim);
}

.masthead-brand {
  font-size: clamp(22px, 3.4vw, 40px);
  font-weight: 300;
  letter-spacing: .18em;
  line-height: 1.1;
  text-decoration: none;
  color: var(--cream-50);
  white-space: nowrap;
  text-indent: .18em;
}

.masthead-issue {
  justify-self: end;
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-align: right;
}
.issue-note {
  font-size: 12px;
  font-weight: 300;
  letter-spacing: .02em;
  color: var(--text-dim);
}

/* 栏目行 */
.nav-row {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-block: 6px;
}

.primary-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(10px, 2.2vw, 30px);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 2px;
  font-size: 15px;
  letter-spacing: .04em;
  text-decoration: none;
  color: rgba(243, 236, 224, .82);
  transition: color .18s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 3px;
  height: 1px;
  background: var(--amber-400);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible { color: var(--cream-50); }
.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--cyan-400); }
.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  width: 16px;
  height: 2px;
  transform: translateX(-50%);
  background: var(--cyan-400);
}

/* 口径索引按钮 */
.index-toggle {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  background: transparent;
  border: 1px solid var(--line-dark-strong);
  border-radius: var(--r-sm);
  font-size: 12px;
  letter-spacing: .16em;
  white-space: nowrap;
  cursor: pointer;
  transition: border-color .18s var(--ease), color .18s var(--ease), background .18s var(--ease);
}
.index-toggle:hover,
.index-toggle:focus-visible,
.index-toggle[aria-expanded="true"] {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
  background: rgba(53, 224, 210, .07);
}
.index-toggle-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber-400);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 13px;
  background: transparent;
  border: 1px solid var(--line-dark-strong);
  border-radius: var(--r-sm);
  font-size: 13px;
  letter-spacing: .1em;
  cursor: pointer;
}
.nav-toggle-bars { display: inline-flex; flex-direction: column; gap: 4px; }
.nav-toggle-bars i { display: block; width: 16px; height: 1px; background: currentColor; }

/* 摘要带 */
.ticker {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  border-top: 1px solid var(--line-dark);
  scrollbar-width: none;
}
.ticker::-webkit-scrollbar { display: none; }

.ticker-track {
  display: flex;
  gap: clamp(20px, 3vw, 44px);
  padding-block: 9px;
  white-space: nowrap;
}

.ticker-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  scroll-snap-align: start;
  font-size: 13px;
  font-weight: 300;
  letter-spacing: .02em;
  color: var(--text-dim);
}

.ticker-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan-400);
  border: 1px solid rgba(53, 224, 210, .4);
  border-radius: var(--r-sm);
  padding: 1px 6px;
}

/* 粘条收缩态 */
.site-header[data-stuck] .masthead-kicker,
.site-header[data-stuck] .masthead-issue,
.site-header[data-stuck] .ticker { display: none; }
.site-header[data-stuck] .masthead { padding-block: 3px; border-bottom-color: transparent; }
.site-header[data-stuck] .masthead-brand { font-size: clamp(18px, 2vw, 24px); }
.site-header[data-stuck] .nav-row { padding-block: 5px 8px; }

/* 口径索引抽屉 */
.index-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  width: min(370px, 88vw);
  display: flex;
  flex-direction: column;
  background: var(--ink-900);
  border-left: 1px solid var(--line-dark);
  transform: translateX(102%);
  visibility: hidden;
  transition: transform .34s var(--ease), visibility .34s var(--ease);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.index-drawer[data-open] { transform: none; visibility: visible; }

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px var(--gut);
  border-bottom: 1px solid var(--line-dark);
}

.drawer-close {
  background: transparent;
  border: 1px solid var(--line-dark-strong);
  border-radius: var(--r-sm);
  padding: 6px 12px;
  font-size: 12px;
  letter-spacing: .14em;
  cursor: pointer;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.drawer-close:hover,
.drawer-close:focus-visible { border-color: var(--amber-400); color: var(--amber-400); }

.drawer-body { padding: 8px var(--gut) 36px; }

.drawer-group { padding-block: 18px; border-bottom: 1px solid var(--line-dark); }
.drawer-group:last-child { border-bottom: 0; }

.drawer-title {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.drawer-list { display: grid; gap: 2px; }

.drawer-link {
  position: relative;
  display: block;
  padding: 9px 0 9px 16px;
  font-size: 15px;
  text-decoration: none;
  color: rgba(243, 236, 224, .84);
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}
.drawer-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--cyan-700);
  transform: translateY(-50%);
  transition: width .18s var(--ease), background .18s var(--ease);
}
.drawer-link:hover,
.drawer-link:focus-visible { color: var(--cyan-400); padding-left: 22px; }
.drawer-link:hover::before,
.drawer-link:focus-visible::before { width: 14px; background: var(--cyan-400); }

.drawer-scrim {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: var(--scrim);
  opacity: 0;
  visibility: hidden;
  transition: opacity .28s var(--ease), visibility .28s var(--ease);
}
.drawer-scrim[data-open] { opacity: 1; visibility: visible; }

/* ==========================================================================
   14. 页脚
   ========================================================================== */
.site-footer {
  background: var(--ink-900);
  color: var(--cream-50);
  border-top: 1px solid var(--line-dark);
}

.footer-inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 76px) var(--gut) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 4vw, 52px);
  padding-bottom: clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--line-dark);
}

.footer-mark {
  display: inline-block;
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 300;
  letter-spacing: .18em;
  text-decoration: none;
  color: var(--cream-50);
  margin-bottom: 16px;
}

.footer-lede {
  max-width: 42ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.footer-trust {
  margin-top: 14px;
  padding-left: 12px;
  border-left: 2px solid var(--amber-600);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(243, 236, 224, .5);
}

.footer-heading {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--cyan-400);
  margin-bottom: 16px;
}

.footer-list { display: grid; gap: 10px; }

.footer-list a {
  position: relative;
  display: inline-block;
  font-size: 14px;
  text-decoration: none;
  color: rgba(243, 236, 224, .78);
  transition: color .18s var(--ease);
}
.footer-list a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--amber-600);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}
.footer-list a:hover,
.footer-list a:focus-visible { color: var(--amber-400); }
.footer-list a:hover::after,
.footer-list a:focus-visible::after { transform: scaleX(1); }

.footer-list-plain li {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

.footer-legal {
  display: grid;
  gap: 8px;
  padding-block: clamp(24px, 4vw, 38px);
}

.footer-legal-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}
.footer-legal-line .label { color: rgba(53, 224, 210, .7); min-width: 74px; }

.footer-bottom {
  background: var(--ink-950);
  border-top: 1px solid var(--line-dark);
  padding: 16px var(--gut);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(243, 236, 224, .5);
}
.footer-copy-note { font-family: var(--font-sans); letter-spacing: .02em; }

/* ==========================================================================
   15. 响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .asym { grid-template-columns: minmax(0, 1fr); }
  .aside-rail { border-left: 0; border-top: 2px solid var(--cyan-700); padding-left: 0; padding-top: 16px; }
}

@media (max-width: 900px) {
  .masthead {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
    text-align: center;
    row-gap: 4px;
    padding-block: 14px 10px;
  }
  .masthead-issue { justify-self: center; text-align: center; }

  .nav-row { justify-content: space-between; padding-block: 8px; }
  .nav-toggle { display: inline-flex; }
  .index-toggle { position: static; transform: none; }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 70;
    display: block;
    background: var(--ink-900);
    border-top: 1px solid var(--line-dark);
    border-bottom: 1px solid var(--line-dark);
    max-height: 0;
    overflow: hidden;
    transition: max-height .28s var(--ease);
  }
  .primary-nav[data-open] { max-height: 480px; }

  .nav-list { flex-direction: column; align-items: stretch; gap: 0; padding-block: 4px; }
  .nav-list li { border-bottom: 1px solid var(--line-dark); }
  .nav-list li:last-child { border-bottom: 0; }
  .nav-link { display: block; padding: 13px 6px; font-size: 15px; }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { background: rgba(53, 224, 210, .08); }
  .nav-link[aria-current="page"]::before {
    left: 0;
    top: 50%;
    width: 3px;
    height: 18px;
    transform: translateY(-50%);
  }

  .ticker { display: none; }

  .grid-2 { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  body { font-size: 15.5px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .chapter-head { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .chapter-num { line-height: 1.6; }
  .data-cell { flex-basis: 74vw; }
}

/* ==========================================================================
   16. 减弱动效
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .paper-stack:hover::before { transform: none; }
  .media-frame:hover img { transform: none; }
}