/* ==========================================================================
   /assets/site.css — 大阳城登录 共享样式
   未来档案室 · Bento 刊头体系
   ========================================================================== */

/* 1. 设计令牌
   ========================================================================== */
:root {
  --ink-900: #071A2F;
  --ink-850: #0A2038;
  --ink-800: #0C2540;
  --ink-700: #12395C;

  --cyan: #2FE3D0;
  --cyan-soft: #7FF3E6;
  --coral: #FF7A59;
  --coral-soft: #FFA98F;

  --paper: #EAF6FF;
  --mist: #9DB6CC;
  --line: #1E4062;
  --live: #4ADE80;

  --r-xl: 28px;
  --r-lg: 22px;
  --r-md: 16px;
  --r-sm: 12px;
  --pill: 999px;

  --w-max: 1200px;
  --pad: clamp(16px, 4vw, 32px);
  --gap: clamp(16px, 2vw, 24px);
  --sec-y: clamp(48px, 7vw, 96px);

  --dur: .22s;
  --ease: cubic-bezier(.2, .7, .3, 1);

  --shadow-soft: 0 20px 50px rgba(2, 10, 20, .5);
  --glow-cyan: 0 0 0 1px rgba(47, 227, 208, .45), 0 0 34px rgba(47, 227, 208, .18);
  --glow-coral: 0 0 0 1px rgba(255, 122, 89, .45), 0 0 30px rgba(255, 122, 89, .16);

  --font-head: "Noto Sans SC", "HarmonyOS Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

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

body, h1, h2, h3, h4, h5, p, figure, blockquote, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid var(--cyan-soft);
  outline-offset: 3px;
  border-radius: 6px;
}

/* 3. 基底与中文排版
   ========================================================================== */
body {
  position: relative;
  min-height: 100vh;
  background:
    radial-gradient(1100px 560px at 82% -12%, rgba(47, 227, 208, .10), transparent 62%),
    radial-gradient(900px 520px at 6% 10%, rgba(255, 122, 89, .08), transparent 66%),
    var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: .01em;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-image:
    linear-gradient(rgba(30, 64, 98, .34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 64, 98, .34) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 20%, transparent 78%);
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 20%, transparent 78%);
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.2;
  color: var(--paper);
}
h1 { font-size: clamp(30px, 4.4vw, 40px); line-height: 1.18; }
h2 { font-size: clamp(24px, 3vw, 28px); line-height: 1.25; }
h3 { font-size: clamp(17px, 2vw, 18px); line-height: 1.45; }
p { color: var(--paper); }
strong { font-weight: 800; }

.mono {
  font-family: var(--font-mono);
  font-size: .8em;
  letter-spacing: .08em;
  text-transform: uppercase;
}

/* 4. 布局与通用容器
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section { padding-block: var(--sec-y); position: relative; }

.section--alt {
  background: linear-gradient(180deg, rgba(12, 37, 64, .85), rgba(7, 26, 47, .25));
  border-top: 1px solid rgba(30, 64, 98, .55);
  border-bottom: 1px solid rgba(30, 64, 98, .55);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.stack { display: flex; flex-direction: column; gap: var(--gap); }
.stack--sm { gap: 12px; }

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 48px);
  background: linear-gradient(90deg, rgba(30, 64, 98, 0), var(--line) 20%, var(--line) 80%, rgba(30, 64, 98, 0));
}

/* 5. 文字组件
   ========================================================================== */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(47, 227, 208, 0));
}

.lead {
  max-width: 68ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 62ch;
  margin-bottom: clamp(24px, 3vw, 40px);
}
.section-head__title { margin: 0; }

.prose { max-width: 68ch; }
.prose p { margin-bottom: 1.1em; color: var(--mist); }
.prose h2 { margin-block: 1.6em .6em; }
.prose h3 { margin-block: 1.4em .5em; }
.prose ul { display: flex; flex-direction: column; gap: 8px; margin-bottom: 1.2em; }
.prose li { position: relative; padding-left: 20px; color: var(--mist); }
.prose li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: .78em;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--cyan);
}

/* 6. 卡片 / 展签 / 按钮 / 徽标 / 数据
   ========================================================================== */
.card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(20px, 2.2vw, 28px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(18, 57, 92, .92), rgba(10, 32, 56, .88));
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(47, 227, 208, .5);
  box-shadow: var(--glow-cyan);
}
.card--focus {
  background: radial-gradient(120% 120% at 12% 0%, rgba(47, 227, 208, .18), rgba(18, 57, 92, .9) 55%, rgba(10, 32, 56, .95));
  border-color: rgba(47, 227, 208, .35);
}
.card__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}
.card__title { margin: 0; }
.card__text { font-size: 15px; line-height: 1.8; color: var(--mist); }

.plate {
  position: relative;
  padding: 14px 18px 14px 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(12, 37, 64, .72);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}
.plate::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--cyan), rgba(47, 227, 208, 0));
}
.plate__title {
  display: block;
  margin-bottom: 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: var(--pill);
  border: 1px solid transparent;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: .01em;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur), color var(--dur), border-color var(--dur);
}
.btn:hover { transform: translateY(-2px); }
.btn--primary {
  background: linear-gradient(135deg, var(--cyan), var(--cyan-soft));
  color: #04202B;
  box-shadow: 0 10px 30px rgba(47, 227, 208, .22);
}
.btn--ghost {
  border-color: rgba(47, 227, 208, .45);
  background: rgba(47, 227, 208, .06);
  color: var(--cyan-soft);
}
.btn--coral {
  background: linear-gradient(135deg, var(--coral), var(--coral-soft));
  color: #2A0F07;
  box-shadow: 0 10px 30px rgba(255, 122, 89, .2);
}
.btn--quiet {
  border-color: var(--line);
  color: var(--mist);
}
.btn--quiet:hover { border-color: rgba(47, 227, 208, .45); color: var(--cyan-soft); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--pill);
  border: 1px solid var(--line);
  background: rgba(18, 57, 92, .6);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--mist);
}
.badge--cyan {
  border-color: rgba(47, 227, 208, .45);
  background: rgba(47, 227, 208, .08);
  color: var(--cyan-soft);
}
.badge--coral {
  border-color: rgba(255, 122, 89, .45);
  background: rgba(255, 122, 89, .1);
  color: var(--coral-soft);
}

.dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--live);
  box-shadow: 0 0 10px rgba(74, 222, 128, .8);
}

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--cyan);
}
.stat__label { font-size: 13px; color: var(--mist); }

/* 7. 面包屑
   ========================================================================== */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}
.crumbs__link { color: var(--mist); transition: color var(--dur); }
.crumbs__link:hover { color: var(--cyan-soft); }
.crumbs__sep { color: var(--line); }
.crumbs__current { color: var(--paper); }

/* 8. 分段切换（标签页）
   ========================================================================== */
.tabs { display: flex; flex-direction: column; gap: clamp(18px, 2.4vw, 28px); }
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  width: fit-content;
  max-width: 100%;
  padding: 6px;
  border-radius: var(--pill);
  border: 1px solid var(--line);
  background: rgba(12, 37, 64, .72);
}
.tabs__tab {
  padding: 10px 18px;
  border-radius: var(--pill);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  color: var(--mist);
  transition: color var(--dur), background var(--dur), box-shadow var(--dur);
}
.tabs__tab:hover { color: var(--cyan-soft); }
.tabs__tab[aria-selected="true"] {
  background: linear-gradient(135deg, var(--cyan), var(--cyan-soft));
  color: #04202B;
  box-shadow: 0 8px 22px rgba(47, 227, 208, .2);
}
.tabs__panel { animation: fadeUp .28s var(--ease) both; }
.tabs__panel[hidden] { display: none; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* 9. 折叠面板
   ========================================================================== */
.accordion { display: flex; flex-direction: column; gap: 12px; }
.accordion__item {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(12, 37, 64, .6);
  overflow: hidden;
  transition: border-color var(--dur);
}
.accordion__item[open] { border-color: rgba(47, 227, 208, .4); }
.accordion__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}
.accordion__summary::-webkit-details-marker { display: none; }
.accordion__summary::after {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}
.accordion__item[open] .accordion__summary::after { transform: rotate(-135deg); }
.accordion__body {
  padding: 0 20px 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* 10. 图片 / 视觉容器基础规则
   ========================================================================== */
.media {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 120% at 15% 0%, rgba(47, 227, 208, .16), rgba(12, 37, 92, .92) 55%, rgba(7, 26, 47, .98));
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .6;
  background-image:
    linear-gradient(rgba(47, 227, 208, .12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 227, 208, .12) 1px, transparent 1px);
  background-size: 32px 32px;
}
.media > img,
.media > svg,
.media > picture,
.media > picture > img,
.media > video {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--21x9 { aspect-ratio: 21 / 9; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }

.media__caption {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--mist);
}
.media__caption::before {
  content: "展签";
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan);
}

/* 11. 侧边章节索引
   ========================================================================== */
.spy { display: flex; flex-direction: column; gap: 4px; font-size: 14px; }
.spy__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--r-sm);
  border-left: 2px solid transparent;
  color: var(--mist);
  transition: color var(--dur), background var(--dur), border-color var(--dur);
}
.spy__link:hover { color: var(--cyan-soft); background: rgba(47, 227, 208, .06); }
.spy__link[aria-current="true"] {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: rgba(47, 227, 208, .1);
}

/* 12. 显现动画与返回顶部
   ========================================================================== */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }

.to-top {
  position: fixed;
  right: clamp(16px, 3vw, 28px);
  bottom: clamp(16px, 3vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  border-radius: var(--pill);
  border: 1px solid rgba(47, 227, 208, .4);
  background: rgba(12, 37, 64, .9);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }

/* ==========================================================================
   13. 页头
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(9, 31, 56, .97), rgba(7, 26, 47, .88));
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.skip-link {
  position: absolute;
  left: 50%;
  top: -120px;
  z-index: 200;
  transform: translateX(-50%);
  padding: 12px 22px;
  border-radius: var(--pill);
  background: var(--cyan);
  color: #04141F;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 14px;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  z-index: 2;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  background: linear-gradient(90deg, var(--cyan), var(--cyan-soft) 45%, var(--coral));
}

/* --- 刊头 --- */
.masthead {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(30, 64, 98, .7);
}
.masthead::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -32%;
  width: 32%;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(47, 227, 208, .16), transparent);
  animation: scan 1.6s var(--ease) 1 both;
}
@keyframes scan {
  from { transform: translateX(0); }
  to { transform: translateX(430%); }
}

.masthead__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 20px;
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 18px var(--pad);
}

.mast-index {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 13px;
  color: var(--mist);
}
.mast-index__item {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 4px 2px;
  transition: color var(--dur);
}
.mast-index__item:hover { color: var(--cyan-soft); }
.mast-index__num { font-size: 11px; color: var(--cyan); }

.mast-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-align: center;
  min-width: 0;
}
.mast-brand__eyebrow {
  font-size: 10.5px;
  letter-spacing: .24em;
  color: var(--mist);
}
.mast-brand__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: -.02em;
  line-height: 1.15;
  color: var(--paper);
  transition: color var(--dur);
}
.mast-brand__name:hover { color: var(--cyan-soft); }
.mast-brand__line {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

.mast-side { display: flex; justify-content: flex-end; }

.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--pill);
  border: 1px solid rgba(255, 122, 89, .45);
  background: linear-gradient(135deg, rgba(255, 122, 89, .16), rgba(255, 169, 143, .06));
  color: var(--coral-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  white-space: nowrap;
  animation: breathe 4.5s ease-in-out infinite;
}
.version-badge__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--live);
  box-shadow: 0 0 10px rgba(74, 222, 128, .85);
}
@keyframes breathe {
  0%, 100% { box-shadow: 0 0 0 rgba(255, 122, 89, 0); }
  50% { box-shadow: 0 0 22px rgba(255, 122, 89, .3); }
}

/* --- 主导航 --- */
.nav-bar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 2px var(--pad);
}

.site-nav { display: block; }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 16px 16px 18px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 15px;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}
.site-nav__link:hover { color: var(--cyan-soft); }
.site-nav__link[aria-current="page"] { color: var(--paper); }
.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 9px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--cyan-soft));
  box-shadow: 0 0 12px rgba(47, 227, 208, .7);
}

.nav-toggle { display: none; }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.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) { transform: translateY(-6px) rotate(-45deg); }

/* ==========================================================================
   14. 页脚
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(12, 37, 64, .78), rgba(7, 26, 47, 1));
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: clamp(28px, 3.5vw, 44px);
  max-width: var(--w-max);
  margin-inline: auto;
  padding: clamp(36px, 5vw, 64px) var(--pad) clamp(24px, 3vw, 36px);
}

.index-bar { display: flex; flex-direction: column; gap: 16px; }
.index-bar__title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: .02em;
  color: var(--mist);
}
.index-bar__title .mono { font-size: 11px; letter-spacing: .2em; color: var(--cyan); }

.index-bar__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}

.index-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(18, 57, 92, .85), rgba(10, 32, 56, .8));
  transition: transform var(--dur) var(--ease), border-color var(--dur), box-shadow var(--dur);
}
.index-card:hover {
  transform: translateY(-4px);
  border-color: rgba(47, 227, 208, .5);
  box-shadow: var(--glow-cyan);
}
.index-card__num {
  flex: none;
  padding: 4px 8px;
  border-radius: var(--r-sm);
  border: 1px solid rgba(47, 227, 208, .35);
  font-size: 13px;
  color: var(--cyan);
}
.index-card__body { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.index-card__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  color: var(--paper);
}
.index-card__desc { font-size: 12.5px; line-height: 1.6; color: var(--mist); }

.footer-main {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 2fr;
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid rgba(30, 64, 98, .7);
}

.footer-brand { display: flex; flex-direction: column; gap: 8px; }
.footer-brand__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -.02em;
  color: var(--paper);
  transition: color var(--dur);
}
.footer-brand__name:hover { color: var(--cyan-soft); }
.footer-brand__line { font-size: 13px; line-height: 1.7; color: var(--mist); }
.footer-brand__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--coral-soft);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 32px);
}
.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-col__list { display: flex; flex-direction: column; gap: 10px; }
.footer-link {
  font-size: 14px;
  color: var(--mist);
  transition: color var(--dur), padding-left var(--dur);
}
.footer-link:hover { color: var(--cyan-soft); padding-left: 4px; }

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid rgba(30, 64, 98, .7);
  font-size: 13px;
  color: var(--mist);
}
.footer-contact__line { display: inline-flex; align-items: baseline; gap: 8px; }
.footer-contact__value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--paper);
}
.footer-contact__note {
  width: 100%;
  font-size: 12px;
  color: rgba(157, 182, 204, .75);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(30, 64, 98, .7);
  font-size: 12.5px;
  color: var(--mist);
}
.footer-base__version { font-family: var(--font-mono); letter-spacing: .02em; }
.footer-base__legal { font-family: var(--font-mono); color: rgba(157, 182, 204, .8); }

/* ==========================================================================
   15. 响应式
   ========================================================================== */
@media (max-width: 1024px) {
  .span-3, .span-4 { grid-column: span 6; }
  .span-8 { grid-column: span 12; }

  .masthead__grid {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: 14px;
    padding: 16px var(--pad);
  }
  .mast-index { justify-content: center; }
  .mast-side { justify-content: center; }

  .footer-main { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  body { padding-bottom: calc(76px + env(safe-area-inset-bottom)); }

  .mast-index { display: none; }
  .mast-brand__name { font-size: 21px; }
  .mast-brand__line { font-size: 11.5px; }

  .nav-bar { padding: 0; }

  .nav-toggle {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 80;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 15px var(--pad) calc(15px + env(safe-area-inset-bottom));
    border-top: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(12, 37, 64, .94), rgba(7, 26, 47, .99));
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    font-family: var(--font-head);
    font-weight: 700;
    font-size: 14px;
    color: var(--paper);
  }
  .nav-toggle__hint { font-size: 11px; letter-spacing: .18em; color: var(--cyan); }

  .site-nav {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: calc(68px + env(safe-area-inset-bottom));
    z-index: 79;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    background: linear-gradient(180deg, rgba(18, 57, 92, .98), rgba(9, 31, 56, .99));
    box-shadow: var(--shadow-soft);
    opacity: 0;
    visibility: hidden;
    transform: translateY(14px);
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
  }
  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .site-nav__link {
    padding: 14px 16px;
    border-radius: var(--r-sm);
    font-size: 16px;
  }
  .site-nav__link[aria-current="page"] {
    background: rgba(47, 227, 208, .1);
    color: var(--cyan-soft);
  }
  .site-nav__link[aria-current="page"]::after { display: none; }

  .index-bar__grid { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr; gap: 24px; }
  .footer-base { flex-direction: column; }
  .to-top { right: 14px; bottom: calc(84px + env(safe-area-inset-bottom)); }
}

@media (max-width: 640px) {
  .span-3, .span-4, .span-6, .span-8 { grid-column: 1 / -1; }
  .footer-cols { grid-template-columns: 1fr; }
}

/* ==========================================================================
   16. 降级与可访问性
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .masthead::after { display: none; }
  .version-badge { animation: none; }
  .js [data-reveal] { opacity: 1; transform: none; }
}