/* ============================================================
   快盈3 CN · 共享外壳样式 /assets/site.css
   画框式导航 + 展览画册节奏 + 仪表盘等宽读数
   ============================================================ */

:root {
  --void: #050A18;
  --panel: #0B1B3A;
  --panel-deep: #071026;
  --line: #1E3A6B;
  --cyan: #22E0D6;
  --cyan-deep: #0E7F7E;
  --gold: #F2A83B;
  --gold-deep: #D98A1E;
  --ink: #EEF4FF;
  --mist: #8A9CC0;
  --paper: #F5F7FA;
  --green: #3DD68C;

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

  --frame-w: 1360px;
  --edge: 28px;
  --header-total: 122px;
  --hard-shadow: 8px 8px 0 rgba(3, 6, 15, 0.9);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 150px;
}

body {
  margin: 0;
  padding-top: var(--header-total);
  background: var(--void);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.9;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  color: var(--ink);
  text-wrap: balance;
}

h1 { font-size: clamp(32px, 4.8vw, 60px); }
h2 { font-size: clamp(26px, 3.2vw, 40px); }
h3 { font-size: clamp(19px, 1.9vw, 24px); }
h4 { font-size: 17px; letter-spacing: 0.01em; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0 0 1em; padding-left: 1.25em; }
li { margin-bottom: 0.35em; }

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

a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--ink); }

button { font: inherit; color: inherit; }

strong, b { font-weight: 800; }

.mono,
time,
[data-year] {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

#main-content { display: block; }
#main-content:focus { outline: none; }

/* ---------- 跳过导航 ---------- */
.skip-link {
  position: fixed;
  left: 16px;
  top: -90px;
  z-index: 200;
  padding: 11px 20px;
  background: var(--cyan);
  color: #03211F;
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 2px solid #03211F;
  transition: top 0.2s var(--ease);
}
.skip-link:focus {
  top: 14px;
  color: #03211F;
}

/* ---------- 通用容器 ---------- */
.frame {
  width: 100%;
  max-width: var(--frame-w);
  margin: 0 auto;
  padding-inline: var(--edge);
}

.section {
  padding-block: clamp(48px, 7vw, 96px);
}

.section-head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(26px, 3.4vw, 44px);
  max-width: 74ch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--cyan);
}

.section-title { color: var(--ink); }

.section-lede {
  color: var(--mist);
  font-size: 16px;
  max-width: 64ch;
}

.prose { max-width: 68ch; }
.prose p { color: var(--mist); }
.prose h3 { margin: 1.6em 0 0.5em; color: var(--ink); }
.prose ul { color: var(--mist); }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  padding-block: 22px 0;
}
.breadcrumb a {
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.breadcrumb .sep { color: var(--line); }
.breadcrumb [aria-current="page"] { color: var(--ink); }

/* ---------- 网格 ---------- */
.grid-8 {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 30px);
}
.col-span-3 { grid-column: span 3; }
.col-span-4 { grid-column: span 4; }
.col-span-5 { grid-column: span 5; }
.col-span-8 { grid-column: span 8; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 2px solid transparent;
  border-radius: 0;
  background: var(--panel);
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease),
    background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.btn:hover { color: var(--ink); }

.btn-gold {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-deep) 100%);
  border-color: var(--gold);
  color: #1A1205;
  box-shadow: 5px 5px 0 rgba(242, 168, 59, 0.22);
}
.btn-gold:hover {
  color: #1A1205;
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(242, 168, 59, 0.3);
}

.btn-cyan {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #03211F;
  box-shadow: 5px 5px 0 rgba(34, 224, 214, 0.2);
}
.btn-cyan:hover {
  color: #03211F;
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(34, 224, 214, 0.26);
}

.btn-ghost {
  background: rgba(34, 224, 214, 0.05);
  border-color: var(--line);
  color: var(--ink);
}
.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(34, 224, 214, 0.1);
}

/* ---------- 卡片 / 索引条 / 数据块 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 2.2vw, 28px);
  background: linear-gradient(160deg, var(--panel) 0%, var(--panel-deep) 100%);
  border: 2px solid var(--line);
  box-shadow: var(--hard-shadow);
  color: var(--ink);
}
.card > h3 { margin-bottom: 0.5em; }
.card p { color: var(--mist); font-size: 15px; }

.idx-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.idx-item {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 16px 6px;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.18s var(--ease), padding-left 0.18s var(--ease);
}
.idx-item:hover {
  background: rgba(34, 224, 214, 0.06);
  padding-left: 12px;
}
.idx-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan-deep);
  min-width: 2.4em;
}
.idx-title {
  font-weight: 800;
  font-size: 16.5px;
  color: var(--ink);
}
.idx-meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
  letter-spacing: 0.08em;
  text-align: right;
}

.stat-block {
  padding: 20px 0;
  border-top: 2px solid var(--line);
}
.stat-block strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--gold);
  font-weight: 700;
}
.stat-block span {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  color: var(--mist);
  line-height: 1.6;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1.5px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
  text-transform: uppercase;
}
.tag::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--green);
}
.tag-cyan { color: var(--cyan); border-color: var(--cyan-deep); }
.tag-gold { color: var(--gold); border-color: rgba(242, 168, 59, 0.5); }

/* ---------- 纸白主题带 ---------- */
.band {
  background: var(--paper);
  color: var(--panel);
  border-block: 2px solid var(--panel);
  padding-block: clamp(40px, 6vw, 84px);
}
.band .section-title,
.band h1,
.band h2,
.band h3,
.band h4 { color: var(--panel); }
.band .section-lede,
.band p { color: #33456B; }
.band .eyebrow { color: var(--cyan-deep); }
.band .eyebrow::before { background: var(--cyan-deep); }
.band .stat-block { border-top-color: rgba(11, 27, 58, 0.25); }
.band .stat-block strong { color: var(--gold-deep); }
.band .stat-block span { color: #33456B; }

/* ---------- 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  border: 2px solid var(--line);
  background:
    linear-gradient(140deg, var(--panel) 0%, var(--panel-deep) 60%, var(--void) 100%);
  box-shadow: var(--hard-shadow);
}
.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    repeating-linear-gradient(90deg, rgba(30, 58, 107, 0.45) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(0deg, rgba(30, 58, 107, 0.28) 0 1px, transparent 1px 46px);
  opacity: 0.7;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(115deg, transparent 38%, rgba(34, 224, 214, 0.14) 50%, transparent 62%);
}
.media-frame img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame figcaption {
  position: relative;
  z-index: 4;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  background: rgba(5, 10, 24, 0.86);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
}
.ratio-16x9 { aspect-ratio: 16 / 9; }
.ratio-4x3 { aspect-ratio: 4 / 3; }
.ratio-1x1 { aspect-ratio: 1 / 1; }

/* ---------- 喀斯特峰林线稿 ---------- */
.karst {
  height: 74px;
  opacity: 0.22;
  pointer-events: none;
  background-image:
    linear-gradient(to top right, transparent 49.5%, var(--cyan) 50%, transparent 50.5%),
    linear-gradient(to top left, transparent 49.5%, var(--cyan) 50%, transparent 50.5%);
  background-size: 132px 100%, 132px 100%;
  background-position: 0 0, 66px 0;
  background-repeat: repeat-x;
  background-color: transparent;
}

/* ---------- 进入视口渐显 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease);
}
.has-js [data-reveal][data-in="true"] {
  opacity: 1;
  transform: none;
}

/* ============================================================
   头部：画框式双轨导航
   ============================================================ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  color: var(--ink);
  background: linear-gradient(180deg, rgba(5, 10, 24, 0.98) 0%, rgba(11, 27, 58, 0.94) 100%);
  border-bottom: 2px solid var(--line);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.site-header::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-deep) 55%, rgba(14, 127, 126, 0) 100%);
  pointer-events: none;
}
.site-header::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 260px;
  height: 100%;
  pointer-events: none;
  background: linear-gradient(118deg, transparent 44%, rgba(34, 224, 214, 0.12) 50%, transparent 56%);
}

.header-rail {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: var(--frame-w);
  margin: 0 auto;
  padding: 10px var(--edge) 10px calc(var(--edge) + 6px);
  min-height: 76px;
  transition: min-height 0.24s var(--ease), padding 0.24s var(--ease);
}

/* 品牌锁定 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--ink);
  text-decoration: none;
}
.brand:hover { color: var(--ink); }

.brand-mark {
  position: relative;
  display: block;
  width: 34px;
  height: 34px;
  border: 2px solid var(--cyan);
  background: var(--panel);
  box-shadow: 4px 4px 0 rgba(34, 224, 214, 0.18);
}
.brand-mark::before {
  content: "";
  position: absolute;
  left: 6px;
  right: 6px;
  top: 6px;
  height: 3px;
  background: var(--cyan);
  box-shadow: 0 7px 0 var(--cyan), 0 14px 0 var(--gold);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--mist);
  text-transform: uppercase;
}

/* 版本线徽标 */
.rail-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1.5px solid var(--line);
  background: rgba(34, 224, 214, 0.06);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  white-space: nowrap;
}
.rail-dot {
  width: 7px;
  height: 7px;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(61, 214, 140, 0.16);
}

.header-note {
  margin: 0;
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: opacity 0.2s var(--ease);
}

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

/* 检索 / 收藏胶囊 */
.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(34, 224, 214, 0.1), rgba(11, 27, 58, 0.62));
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease),
    box-shadow 0.18s var(--ease), background 0.18s var(--ease);
}
.tool-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 224, 214, 0.12);
}
.tool-btn[aria-pressed="true"] {
  border-color: var(--gold);
  color: var(--gold);
  background: linear-gradient(135deg, rgba(242, 168, 59, 0.2), rgba(11, 27, 58, 0.62));
  box-shadow: 0 0 0 3px rgba(242, 168, 59, 0.14);
}

.tool-icon {
  position: relative;
  display: block;
  width: 13px;
  height: 13px;
  flex: 0 0 auto;
}
.tool-icon-search {
  width: 11px;
  height: 11px;
  border: 1.5px solid currentColor;
  border-radius: 50%;
  margin-right: 2px;
}
.tool-icon-search::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -2px;
  width: 6px;
  height: 1.5px;
  background: currentColor;
  transform: rotate(45deg);
}
.tool-icon-pin {
  width: 12px;
  height: 12px;
  background: currentColor;
  clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
}

.tool-text { white-space: nowrap; }

.header-cta {
  padding: 10px 18px;
  font-size: 13px;
  white-space: nowrap;
}

/* 移动栏目按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  background: rgba(34, 224, 214, 0.07);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  cursor: pointer;
}
.nav-toggle-bar {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: var(--cyan);
  transition: transform 0.2s var(--ease);
}
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 2px;
  background: var(--cyan);
  transition: transform 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar {
  transform: translateY(2.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after {
  transform: translateY(-5px) rotate(-90deg);
}
.nav-toggle-text { white-space: nowrap; }

/* 栏目轨 */
.site-nav {
  position: relative;
  z-index: 2;
  border-top: 1px solid rgba(30, 58, 107, 0.7);
  background: linear-gradient(90deg, rgba(11, 27, 58, 0.92) 0%, rgba(5, 10, 24, 0.55) 100%);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: var(--frame-w);
  margin: 0 auto;
  padding: 0 var(--edge) 0 calc(var(--edge) + 6px);
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-item { margin: 0; }

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 2px solid transparent;
  color: var(--mist);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan-deep);
  transition: color 0.2s var(--ease);
}
.nav-link::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width 0.24s var(--ease);
}
.nav-link:hover {
  color: var(--ink);
  background: rgba(34, 224, 214, 0.07);
}
.nav-link:hover::before { width: 100%; }
.nav-link:hover .nav-index { color: var(--cyan); }

.nav-link[aria-current="page"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  background: linear-gradient(180deg, rgba(34, 224, 214, 0.16), rgba(34, 224, 214, 0));
}
.nav-link[aria-current="page"]::before { width: 100%; }
.nav-link[aria-current="page"] .nav-index { color: var(--gold); }

.nav-hint {
  margin: 0 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(138, 156, 192, 0.75);
  white-space: nowrap;
}

/* 检索浮层 */
.site-index {
  position: absolute;
  top: 100%;
  right: var(--edge);
  z-index: 95;
  width: min(540px, calc(100vw - 2 * var(--edge)));
  padding: 22px;
  background: linear-gradient(160deg, var(--panel) 0%, var(--panel-deep) 72%);
  border: 2px solid var(--cyan-deep);
  box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.55);
}
.site-index[hidden] { display: none; }

.index-inner { display: block; }
.index-eyebrow {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}
.index-title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.index-desc {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}
.index-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 16px;
}
.index-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1.5px solid rgba(30, 58, 107, 0.9);
  color: var(--ink);
  font-size: 13.5px;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease),
    color 0.18s var(--ease);
}
.index-link:hover {
  border-color: var(--cyan);
  background: rgba(34, 224, 214, 0.08);
  color: var(--cyan);
}
.index-link-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}
.index-link-text { line-height: 1.3; }

.index-close {
  display: block;
  width: 100%;
  padding: 11px 16px;
  border: 1.5px solid var(--line);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.index-close:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* 滚动进度条 */
.header-progress {
  position: absolute;
  left: 0;
  bottom: -2px;
  display: block;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan-deep) 0%, var(--cyan) 58%, var(--gold) 100%);
  box-shadow: 0 0 12px rgba(34, 224, 214, 0.45);
  transition: width 0.1s linear;
  pointer-events: none;
}

/* 收纳态 */
.site-header[data-shrink="true"] .header-rail {
  min-height: 62px;
  padding-top: 6px;
  padding-bottom: 6px;
}
.site-header[data-shrink="true"] .header-note {
  opacity: 0;
  visibility: hidden;
}
.site-header[data-shrink="true"] .nav-link {
  padding-block: 10px;
}

/* ============================================================
   页脚：最暗的一层
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(60px, 8vw, 120px);
  background-color: var(--void);
  background-image:
    repeating-linear-gradient(90deg, rgba(30, 58, 107, 0.32) 0 1px, transparent 1px 92px),
    repeating-linear-gradient(0deg, rgba(30, 58, 107, 0.22) 0 1px, transparent 1px 92px);
  border-top: 2px solid var(--line);
  color: var(--ink);
}
.site-footer > .karst {
  height: 64px;
  opacity: 0.16;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 0.9fr 0.9fr 0.9fr 1.3fr;
  gap: clamp(24px, 3vw, 44px);
  width: 100%;
  max-width: var(--frame-w);
  margin: 0 auto;
  padding: clamp(40px, 5vw, 72px) var(--edge) clamp(28px, 4vw, 48px);
}

.footer-brand .brand { margin-bottom: 16px; }
.footer-lede {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 34ch;
}
.footer-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: rgba(138, 156, 192, 0.8);
}

.footer-col { min-width: 0; }
.footer-col-title {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(30, 58, 107, 0.9);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.footer-link-list li { margin: 0; }
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 6px 0;
  color: var(--mist);
  font-size: 14.5px;
  text-decoration: none;
  transition: color 0.18s var(--ease);
}
.footer-link::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border: 1.5px solid var(--line);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.footer-link:hover { color: var(--cyan); }
.footer-link:hover::before {
  border-color: var(--cyan);
  background: var(--cyan);
}

.footer-contact { min-width: 0; }
.contact-list {
  margin: 0;
  display: grid;
  gap: 12px;
}
.contact-list dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(138, 156, 192, 0.85);
}
.contact-list dd {
  margin: 3px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
  word-break: break-word;
}

/* 折叠反馈块 */
.footer-fold {
  border-top: 1px solid rgba(30, 58, 107, 0.85);
  background: rgba(11, 27, 58, 0.34);
}
.feedback-fold { border-bottom: 1px solid rgba(30, 58, 107, 0.55); }
.feedback-fold > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 2px;
  cursor: pointer;
  list-style: none;
  color: var(--mist);
  font-size: 13.5px;
  letter-spacing: 0.04em;
  transition: color 0.18s var(--ease);
}
.feedback-fold > summary::-webkit-details-marker { display: none; }
.feedback-fold > summary::before {
  content: "";
  width: 8px;
  height: 8px;
  border: 1.5px solid var(--line);
  flex: 0 0 auto;
}
.feedback-fold > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}
.feedback-fold[open] > summary::after { content: "–"; }
.feedback-fold > summary:hover { color: var(--cyan); }

.feedback-body {
  padding: 0 2px 20px;
  max-width: 68ch;
}
.feedback-body p {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}
.footer-inline-link {
  color: var(--cyan);
  border-bottom: 1px solid rgba(34, 224, 214, 0.45);
}
.footer-inline-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* 底部版权条 */
.footer-bottom {
  border-top: 1px solid rgba(30, 58, 107, 0.6);
  background: rgba(3, 7, 16, 0.6);
}
.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 26px;
  padding-block: 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: rgba(138, 156, 192, 0.9);
}
.footer-legal,
.footer-icp,
.footer-note { margin: 0; }
.footer-year { color: var(--ink); }
.footer-icp { color: var(--mist); }
.footer-note { color: rgba(138, 156, 192, 0.7); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1180px) {
  .header-note { display: none; }
  .nav-hint { display: none; }
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
  .footer-contact { grid-column: 1 / -1; }
  .contact-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 26px; }
}

@media (max-width: 960px) {
  :root { --edge: 20px; --header-total: 74px; }

  body { padding-top: var(--header-total); }

  .header-rail {
    min-height: 64px;
    padding: 8px var(--edge) 8px calc(var(--edge) + 6px);
    gap: 12px;
  }
  .site-header[data-shrink="true"] .header-rail { min-height: 60px; }

  .rail-status { display: none; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }
  .tool-btn { padding: 8px 12px; }
  .tool-btn[data-pin-toggle] .tool-text { display: none; }
  .tool-btn[data-pin-toggle] { padding: 8px 11px; }

  /* 移动栏目抽屉 */
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    border-top: 2px solid var(--line);
    background: linear-gradient(180deg, var(--panel) 0%, var(--void) 100%);
    box-shadow: 0 26px 44px rgba(0, 0, 0, 0.62);
  }
  .site-nav[data-open="true"] { display: block; }

  .nav-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--edge) 18px;
  }
  .nav-list { flex-direction: column; gap: 0; }
  .nav-link {
    justify-content: flex-start;
    gap: 14px;
    padding: 14px 6px;
    border-bottom: 1px solid rgba(30, 58, 107, 0.55);
    font-size: 16px;
  }
  .nav-link::before { display: none; }
  .nav-link[aria-current="page"] {
    background: rgba(34, 224, 214, 0.1);
    border-bottom-color: rgba(34, 224, 214, 0.4);
  }
  .nav-index { min-width: 2.2em; }

  .site-index {
    left: var(--edge);
    right: var(--edge);
    width: auto;
    padding: 18px;
    box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.55);
  }
  .index-grid { grid-template-columns: 1fr; }

  .grid-8 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .col-span-3 { grid-column: span 4; }
  .col-span-4 { grid-column: span 4; }
  .col-span-5 { grid-column: span 4; }
  .col-span-8 { grid-column: span 4; }

  .idx-meta { display: none; }

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

@media (max-width: 640px) {
  :root { --edge: 16px; }

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

  .brand-name { font-size: 18px; }
  .brand-sub { font-size: 9.5px; letter-spacing: 0.16em; }
  .brand-mark { width: 30px; height: 30px; }
  .brand-mark::before { left: 5px; right: 5px; top: 5px; box-shadow: 0 6px 0 var(--cyan), 0 12px 0 var(--gold); }

  .header-tools { gap: 8px; }
  .tool-btn { padding: 8px 10px; font-size: 11.5px; }
  .tool-btn .tool-text { display: none; }
  .tool-btn[data-pin-toggle] { padding: 8px 10px; }

  .grid-8 { grid-template-columns: minmax(0, 1fr); }
  .col-span-3,
  .col-span-4,
  .col-span-5,
  .col-span-8 { grid-column: span 1; }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .contact-list { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom-inner { flex-direction: column; align-items: flex-start; gap: 6px; }
  .karst { height: 54px; opacity: 0.18; background-size: 96px 100%, 96px 100%; background-position: 0 0, 48px 0; }
}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .has-js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
  .btn:hover,
  .btn-gold:hover,
  .btn-cyan:hover { transform: none; }
  .idx-item:hover { padding-left: 6px; }
}