/* ==========================================================================
   雷火体育 · 共享样式表 /assets/site.css
   视觉原型：夜间数据档案室 × 赛场记分牌
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --ink-900: #111418;
  --ink-800: #1C2126;
  --ink-850: #22282E;
  --ink-700: #2A3138;
  --mist: #E8ECEF;
  --steel: #93A1AD;
  --lava: #FF4D00;
  --lava-soft: rgba(255, 77, 0, 0.08);
  --bolt: #FFD400;
  --wire: #2D9CFF;
  --red-card: #E01B24;
  --paper: #F4F6F7;
  --paper-ink: #14181C;
  --paper-sub: #46525C;
  --soil: #7A2A0A;

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

  --step-xs: 12px;
  --step-sm: 14px;
  --step-md: 17px;
  --step-lg: 22px;
  --step-xl: 32px;
  --step-2xl: 56px;
  --step-3xl: 104px;

  --shell-max: 1240px;
  --gutter: 24px;
  --header-h: 104px;
  --dur: 180ms;
  --dur-slow: 420ms;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

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

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

input, select, textarea { font: inherit; color: inherit; }

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

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

summary { cursor: pointer; }

hr { border: 0; border-top: 1px solid var(--ink-700); }

/* ---------- 3. 基础中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, rgba(42, 49, 56, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 49, 56, 0.55) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: var(--step-md);
  font-weight: 500;
  line-height: 1.9;
  letter-spacing: 0.01em;
}

h1, h2, h3, h4 { line-height: 1.25; font-weight: 800; }

p + p { margin-top: 1.2em; }

strong { font-weight: 800; }

::selection { background: var(--lava); color: #ffffff; }

.shell {
  width: min(var(--shell-max), 100% - (var(--gutter) * 2));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 200;
  padding: 12px 18px;
  background: var(--bolt);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 2px solid var(--ink-900);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { top: 12px; }

:focus-visible {
  outline: 2px solid var(--bolt);
  outline-offset: 3px;
}

/* ---------- 4. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink-900);
  border-bottom: 1px solid var(--ink-700);
}

.header-utility { border-bottom: 1px solid var(--ink-700); }

.header-utility__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  padding-block: 8px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
}

.brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--lava) 0%, var(--bolt) 100%);
  color: var(--ink-900);
  font-size: 18px;
  font-weight: 900;
  line-height: 1;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand__name {
  font-size: var(--step-md);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.mono-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 28px;
  padding: 7px 10px;
  border: 1px solid var(--ink-700);
  background: rgba(255, 212, 0, 0.06);
  color: var(--bolt);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1;
  white-space: nowrap;
}

.mono-chip--muted {
  color: var(--steel);
  background: transparent;
}

.mono-chip--wire {
  color: var(--wire);
  border-color: rgba(45, 156, 255, 0.4);
  background: rgba(45, 156, 255, 0.06);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--ink-700);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover { border-color: var(--lava); color: var(--bolt); }

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

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--bolt);
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease),
    bottom var(--dur) var(--ease);
}

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

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

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

.header-nav {
  background: var(--ink-900);
}

.header-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 48px;
}

.nav-list {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
  gap: 2px;
}

.nav-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 16px;
  border-bottom: 3px solid transparent;
  color: var(--mist);
  font-size: 15px;
  font-weight: 700;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.nav-list a:hover {
  color: var(--bolt);
  background: var(--ink-800);
}

.nav-list a[aria-current="page"] {
  color: var(--lava);
  border-bottom-color: var(--lava);
}

.nav-quick {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 8px 14px;
  border: 1px solid var(--ink-700);
  color: var(--wire);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.nav-quick:hover {
  border-color: var(--wire);
  background: rgba(45, 156, 255, 0.08);
  color: var(--bolt);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--lava) 0%, var(--bolt) 100%);
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
  pointer-events: none;
}

/* ---------- 5. 页脚 ---------- */
.site-footer {
  margin-top: clamp(64px, 8vw, 120px);
  background: var(--ink-800);
  border-top: 1px solid var(--ink-700);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.3fr;
  gap: 40px;
  padding-block: 64px 40px;
}

.footer-col { min-width: 0; }

.footer-col--brand { display: flex; flex-direction: column; align-items: flex-start; }

.footer-brand {
  font-size: var(--step-lg);
  font-weight: 800;
  line-height: 1.35;
}

.footer-tagline {
  margin-top: 10px;
  color: var(--steel);
  font-size: 15px;
  max-width: 26ch;
}

.footer-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.footer-title {
  display: block;
  margin-bottom: 16px;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.footer-list li + li { margin-top: 10px; }

.footer-list a {
  display: inline-block;
  padding-block: 2px;
  border-bottom: 1px solid transparent;
  color: var(--mist);
  font-size: 15px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-list a:hover {
  color: var(--bolt);
  border-bottom-color: var(--bolt);
}

.footer-contact li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 15px;
  color: var(--mist);
}

.footer-contact li + li { margin-top: 10px; }

.footer-contact__label {
  flex: none;
  min-width: 42px;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.08em;
}

.footer-contact span:last-child { word-break: break-word; }

.footer-note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 2px solid var(--soil);
  color: var(--steel);
  font-size: var(--step-sm);
  line-height: 1.8;
  max-width: 34ch;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 20px 32px;
  border-top: 1px solid var(--ink-700);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.06em;
}

.footer-base__copy { color: var(--steel); }

.footer-base__list {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-base__list a {
  color: var(--wire);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-base__list a:hover {
  color: var(--bolt);
  border-bottom-color: var(--bolt);
}

/* ---------- 6. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-align: center;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.btn--primary {
  background: var(--lava);
  color: #ffffff;
}

.btn--primary:hover {
  background: #FF6A26;
  box-shadow: inset 0 0 0 1px var(--bolt);
}

.btn--bolt {
  background: var(--bolt);
  color: var(--ink-900);
}

.btn--bolt:hover { background: #FFE24D; }

.btn--ghost {
  background: transparent;
  border-color: var(--ink-700);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: var(--step-sm);
  font-weight: 500;
  letter-spacing: 0.06em;
}

.btn--ghost:hover {
  border-color: var(--lava);
  color: var(--bolt);
}

.btn--sm {
  min-height: 36px;
  padding: 6px 14px;
  font-size: var(--step-xs);
}

/* ---------- 7. 分区与标题 ---------- */
.section { padding-block: clamp(56px, 8vw, 112px); }

.section--paper {
  background: var(--paper);
  color: var(--paper-ink);
  background-image: none;
}

.section--soil {
  background: linear-gradient(135deg, var(--soil) 0%, #4A1A07 100%);
  border-block: 1px solid rgba(255, 212, 0, 0.18);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.section-label {
  display: inline-block;
  color: var(--lava);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-label::before { content: "[ "; }
.section-label::after { content: " ]"; }

.section--paper .section-label { color: #B23A00; }
.section--soil .section-label { color: var(--bolt); }

.font-display {
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.display-xl {
  font-size: clamp(44px, 7vw, var(--step-3xl));
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.display-lg {
  font-size: clamp(32px, 4vw, var(--step-2xl));
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.015em;
}

.display-md {
  font-size: clamp(20px, 2.4vw, var(--step-xl));
  font-weight: 800;
  line-height: 1.3;
}

.section--paper h1,
.section--paper h2,
.section--paper h3,
.section--paper h4 { color: #0E1216; }

.divider {
  height: 1px;
  background: var(--ink-700);
  border: 0;
}

.section--paper .divider { background: #D3D9DE; }

/* ---------- 8. 正文与面包屑 ---------- */
.content-container { max-width: 72ch; }

.prose { max-width: 72ch; }

.prose p + p { margin-top: 1.2em; }

.prose h2 {
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  font-size: clamp(22px, 2.6vw, var(--step-xl));
}

.prose h3 {
  margin-top: 1.6em;
  margin-bottom: 0.5em;
  font-size: var(--step-lg);
}

.prose ul,
.prose ol {
  margin-top: 1em;
  padding-left: 1.3em;
  list-style: square;
}

.prose li + li { margin-top: 0.5em; }

.prose strong { color: var(--bolt); }

.prose a { color: var(--wire); border-bottom: 1px solid rgba(45, 156, 255, 0.45); }

.prose a:hover { color: var(--bolt); border-bottom-color: var(--bolt); }

.prose--light,
.section--paper .prose { color: var(--paper-sub); }

.section--paper .prose strong { color: #B23A00; }

.section--paper .prose a { color: #0B62B8; }

.section--paper .prose a:hover { color: var(--lava); border-bottom-color: var(--lava); }

.link-wire {
  color: var(--wire);
  border-bottom: 1px solid rgba(45, 156, 255, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.link-wire:hover { color: var(--bolt); border-bottom-color: var(--bolt); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.06em;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--ink-700);
}

.breadcrumb a { color: var(--wire); }

.breadcrumb a:hover { color: var(--bolt); }

.breadcrumb [aria-current="page"] { color: var(--steel); }

.section--paper .breadcrumb { color: var(--paper-sub); }

/* ---------- 9. 网格 ---------- */
.grid {
  display: grid;
  gap: 24px;
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.grid--asym {
  grid-template-columns: minmax(0, 32fr) minmax(0, 68fr);
  gap: 48px;
}

/* ---------- 10. 档案卡片 ---------- */
.archive-card {
  position: relative;
  display: block;
  padding: 24px;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  border-radius: 0;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.archive-card:hover {
  transform: translateY(-2px);
  background: var(--ink-850);
  border-color: var(--lava);
}

.archive-card--accent { border-left: 3px solid var(--lava); }

.archive-card__index {
  display: block;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
}

.archive-card__title {
  margin-top: 8px;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--mist);
}

.archive-card__body {
  margin-top: 10px;
  color: rgba(232, 236, 239, 0.78);
  font-size: 15px;
  line-height: 1.8;
}

.archive-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.section--paper .archive-card {
  background: #FFFFFF;
  border-color: #D3D9DE;
}

.section--paper .archive-card:hover { background: #FFFFFF; }

.section--paper .archive-card__title { color: #0E1216; }

.section--paper .archive-card__body { color: var(--paper-sub); }

.section--paper .archive-card__index { color: #5B6874; }

/* ---------- 11. 数据块 ---------- */
.stat { display: block; }

.stat__value {
  display: block;
  color: var(--bolt);
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.4vw, var(--step-2xl));
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
}

.stat__label {
  display: block;
  margin-top: 10px;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
}

.section--paper .stat__value { color: #C63C00; }

.section--paper .stat__label { color: var(--paper-sub); }

/* ---------- 12. 标签与筛选 ---------- */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--ink-700);
  border-radius: 0;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 500;
  letter-spacing: 0.06em;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.chip:hover { color: var(--mist); border-color: var(--steel); }

.chip[aria-pressed="true"],
.chip.is-active {
  background: var(--lava);
  border-color: var(--lava);
  color: #ffffff;
}

.chip--bolt { color: var(--bolt); border-color: rgba(255, 212, 0, 0.4); }

.chip--red { color: #FF6A6A; border-color: rgba(224, 27, 36, 0.5); }

.section--paper .chip { color: var(--paper-sub); border-color: #D3D9DE; }

.section--paper .chip[aria-pressed="true"],
.section--paper .chip.is-active {
  background: var(--lava);
  border-color: var(--lava);
  color: #ffffff;
}

/* ---------- 13. 表格 ---------- */
.data-table {
  width: 100%;
  border: 1px solid var(--ink-700);
  font-size: 15px;
  text-align: left;
}

.data-table caption {
  padding-bottom: 12px;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.08em;
  text-align: left;
}

.data-table th {
  padding: 12px 16px;
  background: var(--ink-800);
  border-bottom: 1px solid var(--ink-700);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--ink-700);
  vertical-align: top;
}

.data-table tbody tr {
  transition: background-color var(--dur) var(--ease);
}

.data-table tbody tr:hover { background: var(--lava-soft); }

.data-table tbody tr:last-child td { border-bottom: 0; }

.data-table a {
  color: var(--wire);
  border-bottom: 1px solid rgba(45, 156, 255, 0.4);
}

.data-table a:hover { color: var(--bolt); border-bottom-color: var(--bolt); }

.data-table--light {
  border-color: #D3D9DE;
  color: var(--paper-ink);
  background: #FFFFFF;
}

.data-table--light th {
  background: #E7ECEF;
  border-color: #D3D9DE;
  color: var(--paper-sub);
}

.data-table--light td { border-color: #D3D9DE; }

.data-table--light tbody tr:hover { background: rgba(255, 77, 0, 0.07); }

.data-table--light a { color: #0B62B8; }

.data-table--light a:hover { color: var(--lava); border-bottom-color: var(--lava); }

/* ---------- 14. 时间轴 ---------- */
.timeline {
  position: relative;
  padding-top: 34px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--lava) 0%, var(--bolt) 42%, var(--ink-700) 100%);
}

.timeline__item {
  position: relative;
  padding-left: 22px;
}

.timeline__node {
  position: absolute;
  left: 0;
  top: 12px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 2px solid var(--lava);
}

.timeline__item[data-state="current"] .timeline__node {
  background: var(--lava);
  box-shadow: 0 0 0 4px rgba(255, 77, 0, 0.18);
}

.timeline__version {
  display: block;
  color: var(--bolt);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.timeline__text {
  margin-top: 6px;
  color: rgba(232, 236, 239, 0.8);
  font-size: 15px;
}

/* ---------- 15. 手风琴 ---------- */
.accordion { border-top: 1px solid var(--ink-700); }

.accordion details { border-bottom: 1px solid var(--ink-700); }

.accordion summary {
  position: relative;
  display: block;
  padding: 18px 48px 18px 0;
  font-size: var(--step-md);
  font-weight: 700;
  list-style: none;
}

.accordion summary::-webkit-details-marker { display: none; }

.accordion summary::after {
  content: "+";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--lava);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
}

.accordion details[open] summary::after { content: "\2013"; }

.accordion__body {
  max-width: 72ch;
  padding-bottom: 22px;
  color: rgba(232, 236, 239, 0.8);
  font-size: 15px;
}

.section--paper .accordion { border-color: #D3D9DE; }

.section--paper .accordion details { border-color: #D3D9DE; }

.section--paper .accordion summary { color: #0E1216; }

.section--paper .accordion__body { color: var(--paper-sub); }

/* ---------- 16. 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  aspect-ratio: 16 / 9;
}

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

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame--grid::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(42, 49, 56, 0.9) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 49, 56, 0.9) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.media-frame--glow::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: radial-gradient(120% 90% at 18% 0%, rgba(255, 77, 0, 0.3) 0%, transparent 62%);
  mix-blend-mode: screen;
  pointer-events: none;
}

.media-frame__caption {
  display: block;
  margin-top: 10px;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.06em;
}

/* ---------- 17. 显现与动效降级 ---------- */
.reveal {
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}

.has-js .reveal {
  opacity: 0;
  transform: translateY(12px);
}

.has-js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .has-js .reveal {
    opacity: 1;
    transform: none;
  }

  .archive-card:hover { transform: none; }
}

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1024px) {
  :root { --gutter: 20px; }

  .brand__tagline { display: none; }

  .nav-toggle { display: inline-flex; }

  .header-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: var(--ink-800);
    border-bottom: 2px solid var(--lava);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
  }

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

  .header-nav__inner {
    display: block;
    padding-block: 8px 16px;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-list a {
    min-height: 52px;
    padding-left: 14px;
    border-bottom: 1px solid var(--ink-700);
    border-left: 3px solid transparent;
  }

  .nav-list a:hover { background: rgba(255, 212, 0, 0.06); }

  .nav-list a[aria-current="page"] {
    color: var(--lava);
    background: var(--lava-soft);
    border-bottom-color: var(--ink-700);
    border-left-color: var(--lava);
  }

  .nav-quick {
    justify-content: center;
    width: 100%;
    min-height: 44px;
    margin-top: 14px;
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
    padding-block: 48px 32px;
  }

  .footer-note { max-width: none; }
}

@media (max-width: 900px) {
  .grid--2,
  .grid--3,
  .grid--asym { grid-template-columns: minmax(0, 1fr); }

  .grid--asym { gap: 32px; }
}

@media (max-width: 760px) {
  .mono-chip--muted { display: none; }
}

@media (max-width: 600px) {
  :root { --gutter: 16px; }

  body { font-size: 16px; line-height: 1.85; }

  .login-link { display: none; }

  .brand__mark { width: 32px; height: 32px; font-size: 16px; }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .archive-card { padding: 18px; }

  .data-table { font-size: var(--step-sm); }

  .data-table th,
  .data-table td { padding: 10px 12px; }
}