/* ==========================================================================
   NOUYA SPORTS · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 头部 / 页脚 / 按钮 / 基础组件
   ========================================================================== */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol { margin: 0; }

ul[class],
ol[class] { list-style: none; padding: 0; }

h1, h2, h3, h4 { line-height: 1.24; font-weight: 600; letter-spacing: -0.012em; }

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

button { font: inherit; color: inherit; }

a { color: inherit; }

::selection { background: rgba(53, 242, 214, 0.28); color: #eaf2f8; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-0: #071426;
  --ink-1: #0d2036;
  --panel: #16324f;
  --line: #21456a;
  --cyan: #35f2d6;
  --cyan-soft: #9cf4e4;
  --orange: #ff7a2f;
  --paper: #eaf2f8;
  --muted: #7f94aa;
  --pool: #0f3b3a;

  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "Noto Serif SC", Georgia, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --max: 1280px;
  --rail: 96px;
  --radius: 14px;
  --radius-organic: 18px 18px 18px 4px;
  --pad-x: clamp(16px, 2.6vw, 28px);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ---------- 3. 中文排版与页面底色 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.85;
  font-weight: 400;
  color: var(--paper);
  letter-spacing: 0.008em;
  background-color: var(--ink-0);
  background-image:
    radial-gradient(1200px 640px at 82% -12%, rgba(53, 242, 214, 0.075), transparent 62%),
    radial-gradient(920px 560px at 4% 8%, rgba(22, 50, 79, 0.62), transparent 66%),
    repeating-linear-gradient(90deg, rgba(33, 69, 106, 0.34) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(33, 69, 106, 0.22) 0 1px, transparent 1px 96px),
    linear-gradient(180deg, #071426 0%, #08182b 46%, #071426 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-serif); }

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

strong { color: var(--cyan-soft); font-weight: 600; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

#main-content { scroll-margin-top: 104px; }

/* ---------- 4. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: -72px;
  left: 14px;
  z-index: 300;
  padding: 11px 20px;
  background: var(--cyan);
  color: #04161c;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 0 0 10px 10px;
  transition: top 0.18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { top: 0; }

/* ---------- 5. 头部框架导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(7, 20, 38, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(53, 242, 214, 0) 44%, rgba(255, 122, 47, 0.95) 86%, rgba(255, 122, 47, 0) 100%);
  pointer-events: none;
}

.site-header__frame {
  max-width: var(--max);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 28px);
  padding: 12px var(--pad-x);
  min-height: 78px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--paper);
  padding-right: 18px;
  border-right: 1px solid var(--line);
}

.brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--cyan);
  border-radius: 10px 10px 10px 3px;
  background: linear-gradient(150deg, rgba(53, 242, 214, 0.18), rgba(15, 59, 58, 0.1));
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.brand__mark::before {
  content: "";
  width: 13px;
  height: 13px;
  border: 1.5px solid var(--cyan);
  border-radius: 50%;
}

.brand__mark::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -4px;
  width: 9px;
  height: 9px;
  background: var(--orange);
  border-radius: 2px;
}

.brand:hover .brand__mark { border-color: var(--cyan-soft); transform: translateY(-1px); }

.brand__text { display: flex; flex-direction: column; line-height: 1.16; }

.brand__name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.brand__sub {
  font-family: var(--font-sans);
  font-size: 9.5px;
  letter-spacing: 0.22em;
  color: var(--muted);
  text-transform: uppercase;
}

.header-tagline {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  white-space: nowrap;
  padding-left: 2px;
  border-left: 1px solid var(--line);
  padding-left: 18px;
}

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 0.7vw, 10px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__item { list-style: none; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 10px 11px;
  font-size: 15px;
  line-height: 1.4;
  color: var(--paper);
  text-decoration: none;
  border-radius: 8px;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  transition: color 0.18s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 4px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease);
}

.site-nav__link:hover { color: var(--cyan-soft); }
.site-nav__link:hover .site-nav__idx { color: var(--cyan); }
.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] { color: var(--cyan); }
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--orange); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

/* 移动面板内的副区（桌面隐藏） */
.site-nav__foot { display: none; }

.site-nav__domain {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.quick-links__link {
  display: inline-block;
  padding: 7px 13px;
  font-size: 13px;
  text-decoration: none;
  color: var(--cyan-soft);
  background: rgba(15, 59, 58, 0.55);
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.quick-links__link:hover { border-color: var(--cyan); color: var(--cyan); }

/* 右侧行动区 */
.header-cta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  margin-left: clamp(6px, 1vw, 16px);
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 13px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--paper);
  cursor: pointer;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan-soft); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: background-color 0.18s var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.22s var(--ease), top 0.22s var(--ease);
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.nav-toggle__label { font-size: 13px; letter-spacing: 0.08em; }

.site-header[data-open] .nav-toggle { border-color: var(--cyan); color: var(--cyan); }
.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* 滚动进度 */
.site-header__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  pointer-events: none;
  background: transparent;
}

.site-header__progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width 0.1s linear;
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  border-top: 1px solid var(--line);
  background-image:
    radial-gradient(900px 420px at 12% 0%, rgba(53, 242, 214, 0.07), transparent 62%),
    linear-gradient(180deg, #081a2d 0%, #071426 60%, #050f1d 100%);
  color: var(--paper);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(440px, 68%);
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 242, 214, 0));
}

.site-footer__inner {
  max-width: var(--max);
  margin-inline: auto;
  padding: clamp(38px, 5.4vw, 68px) var(--pad-x) clamp(26px, 3.4vw, 40px);
  display: grid;
  grid-template-columns: minmax(280px, 1.15fr) 2fr;
  gap: clamp(26px, 4vw, 64px);
}

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

.footer-brand__name {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.footer-brand__sub {
  margin-top: 4px;
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--cyan);
  text-transform: uppercase;
}

.footer-brand__tagline {
  margin-top: 14px;
  font-size: 14px;
  color: var(--paper);
}

.footer-brand__domain {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.footer-contact {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid rgba(33, 69, 106, 0.7);
  display: grid;
  gap: 8px;
}

.footer-contact__row {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.7;
}

.footer-contact__key {
  color: var(--muted);
  letter-spacing: 0.04em;
}

.footer-contact__val {
  color: var(--paper);
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 36px);
  align-content: start;
}

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

.footer-col__title {
  font-family: var(--font-sans);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.footer-col__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--paper);
  text-decoration: none;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.footer-link:hover {
  color: var(--cyan);
  border-bottom-color: rgba(53, 242, 214, 0.6);
  transform: translateX(3px);
}

.site-footer__legal {
  max-width: var(--max);
  margin-inline: auto;
  padding: 16px var(--pad-x) 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  border-top: 1px solid rgba(33, 69, 106, 0.7);
}

.legal-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.legal-links__item {
  font-size: 12.5px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.legal-links__item:hover { color: var(--cyan); }

.to-top {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), opacity 0.2s var(--ease);
}

.to-top:hover { color: var(--cyan); border-color: var(--cyan); }

.to-top__arrow { font-family: var(--font-mono); line-height: 1; }

.to-top.is-active { color: var(--cyan-soft); border-color: rgba(53, 242, 214, 0.5); }

/* ---------- 7. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.3;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
              border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.btn--solid { background: var(--cyan); color: #04161c; border-color: var(--cyan); }
.btn--solid:hover { background: var(--cyan-soft); border-color: var(--cyan-soft); transform: translateY(-1px); }

.btn--ghost { background: transparent; color: var(--paper); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn--accent { background: var(--orange); color: #1a0a02; border-color: var(--orange); }
.btn--accent:hover { background: #ff9356; border-color: #ff9356; transform: translateY(-1px); }

.btn--sm { padding: 9px 15px; font-size: 13px; border-radius: 9px; }

/* ---------- 8. 布局与章节 ---------- */
.container {
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  width: 100%;
}

.section {
  position: relative;
  padding-block: clamp(46px, 6.4vw, 92px);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(64px, 96px) minmax(0, 1fr);
  gap: clamp(12px, 2vw, 28px);
  align-items: start;
  padding-bottom: clamp(18px, 2.4vw, 30px);
  margin-bottom: clamp(20px, 2.8vw, 36px);
  border-bottom: 1px solid var(--line);
}

.section-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  padding-top: 4px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 12px;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--orange);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 28px);
}

.grid--split { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); }
.grid--triptych { grid-template-columns: minmax(0, 3fr) minmax(0, 6fr) minmax(0, 3fr); }

/* ---------- 9. 正文、面包屑 ---------- */
.prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--paper);
}

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

.prose h2,
.prose h3 { margin-top: 1.8em; margin-bottom: 0.6em; }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding-block: 18px;
}

.breadcrumbs a { color: var(--muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--cyan); }

.breadcrumbs__sep { color: var(--line); }

/* ---------- 10. 卡片 / 面板 / 标签 / 指标 ---------- */
.card,
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: linear-gradient(160deg, rgba(22, 50, 79, 0.92), rgba(13, 32, 54, 0.92));
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.card:hover { border-color: var(--cyan); transform: translateY(-2px); }

.card__title {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--cyan-soft);
  background: rgba(15, 59, 58, 0.7);
  border: 1px solid rgba(53, 242, 214, 0.28);
  border-radius: 999px;
}

.tag--alert {
  color: var(--orange);
  border-color: rgba(255, 122, 47, 0.45);
  background: rgba(255, 122, 47, 0.1);
}

.stat { display: flex; flex-direction: column; gap: 2px; }

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.8vw, 34px);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.stat--alert .stat__value { color: var(--orange); }

.stat__label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---------- 11. 数据表格 ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
}

.data-table caption {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding-bottom: 10px;
}

.data-table th,
.data-table td {
  padding: 11px 14px;
  text-align: left;
  border-bottom: 1px solid rgba(33, 69, 106, 0.8);
}

.data-table thead th {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.data-table tbody tr:hover { background: rgba(53, 242, 214, 0.06); }

.data-table td.is-num,
.data-table th.is-num { font-family: var(--font-mono); text-align: right; }

/* ---------- 12. 筛选条 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  padding-block: 14px 18px;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.chip {
  padding: 7px 15px;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--paper);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease),
              background-color 0.18s var(--ease);
}

.chip:hover { color: var(--cyan-soft); border-color: rgba(53, 242, 214, 0.55); }

.chip[aria-pressed="true"] {
  color: #04161c;
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 600;
}

.filter-bar__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 13. 图片容器（页面阶段放占位图） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  background-color: var(--ink-1);
  background-image:
    radial-gradient(circle at 24% 18%, rgba(53, 242, 214, 0.14), transparent 46%),
    repeating-linear-gradient(90deg, rgba(33, 69, 106, 0.45) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(0deg, rgba(33, 69, 106, 0.28) 0 1px, transparent 1px 40px);
  aspect-ratio: 16 / 9;
}

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

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-frame__caption {
  position: absolute;
  right: 12px;
  bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
  background: rgba(7, 20, 38, 0.78);
  padding: 3px 8px;
  border-radius: 4px;
}

/* ---------- 14. 左侧数据轨（页面阶段使用） ---------- */
.rail {
  position: fixed;
  top: 78px;
  bottom: 0;
  left: 0;
  width: var(--rail);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 22px 0;
  background: rgba(8, 22, 40, 0.9);
  border-right: 1px solid var(--line);
  z-index: 40;
}

.rail__link {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 10px;
  font-variant-numeric: tabular-nums;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.rail__link:hover { color: var(--cyan-soft); }

.rail__link[aria-current="true"] {
  color: var(--cyan);
  border-color: rgba(53, 242, 214, 0.5);
  background: rgba(15, 59, 58, 0.6);
}

/* ---------- 15. 显现 ---------- */
[data-reveal],
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.42s var(--ease), transform 0.42s var(--ease);
}

[data-reveal].is-revealed,
.reveal.is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1240px) {
  .header-tagline { display: none; }
  .brand { padding-right: 14px; }
}

@media (max-width: 1100px) {
  .header-cta .btn--ghost { display: none; }
  .site-nav__link { font-size: 14.5px; padding-inline: 8px; }
}

@media (max-width: 1024px) {
  .header-cta { display: none; }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    margin: 0;
    padding: 0 var(--pad-x);
    background: var(--ink-1);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height 0.32s var(--ease), opacity 0.22s var(--ease),
                visibility 0.32s var(--ease), padding 0.32s var(--ease);
  }

  .site-header[data-open] .site-nav {
    max-height: min(78vh, 660px);
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
    padding-block: 12px 22px;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__item { border-bottom: 1px solid rgba(33, 69, 106, 0.55); }

  .site-nav__link {
    display: flex;
    width: 100%;
    padding: 15px 2px;
    font-size: 16.5px;
    border-radius: 0;
  }

  .site-nav__link::after {
    left: 2px;
    right: auto;
    width: 24px;
    bottom: 8px;
  }

  .site-nav__foot {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding-top: 18px;
  }

  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--split,
  .grid--triptych { grid-template-columns: minmax(0, 1fr); }
  .rail { display: none; }
}

@media (max-width: 760px) {
  body {
    font-size: 16px;
    background-attachment: scroll;
    background-image:
      radial-gradient(720px 420px at 88% -8%, rgba(53, 242, 214, 0.08), transparent 64%),
      radial-gradient(620px 380px at 0% 6%, rgba(22, 50, 79, 0.6), transparent 68%),
      linear-gradient(180deg, #071426 0%, #08182b 50%, #071426 100%);
  }

  .site-header__frame { min-height: 66px; padding-block: 10px; gap: 10px; }
  .brand { padding-right: 0; border-right: none; }
  .brand__mark { width: 32px; height: 32px; }
  .brand__name { font-size: 18px; }
  .brand__sub { font-size: 8.5px; letter-spacing: 0.18em; }

  .section-head { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .section-num { font-size: 22px; }

  .footer-nav { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-contact__row { grid-template-columns: 72px minmax(0, 1fr); }

  .site-footer__legal { flex-direction: column; align-items: flex-start; gap: 8px; }
  .to-top { margin-left: 0; }

  .data-table { display: block; overflow-x: auto; white-space: nowrap; }

  .filter-bar__count { margin-left: 0; width: 100%; }
}

/* ---------- 17. 可访问性与动效降级 ---------- */
@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;
  }

  [data-reveal],
  .reveal { opacity: 1; transform: none; }

  .card:hover,
  .btn:hover,
  .footer-link:hover { transform: none; }
}