/* ============================================================
   优德赛事 · 高原夜赛数据台
   /assets/site.css — 共享外壳：reset / 变量 / 排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

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

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

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

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

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

button { font: inherit; color: inherit; background: none; border: 0; }

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

table { border-collapse: collapse; }

/* ---------- 2. Tokens ---------- */
:root {
  /* 色彩 */
  --c-night: #070D1F;
  --c-deep: #101A3C;
  --c-dust: #9AA8C7;
  --c-snow: #F5F8FF;
  --c-teal: #2DD4BF;
  --c-ember: #FF9F43;
  --c-flag-blue: #4C8DFF;
  --c-flag-red: #F2646A;
  --c-flag-green: #42D392;
  --c-flag-yellow: #F4C95D;
  --c-mist: #5E6A8F;

  /* 线条与面板 */
  --line-faint: rgba(154, 168, 199, 0.12);
  --line-soft: rgba(154, 168, 199, 0.18);
  --line-strong: rgba(154, 168, 199, 0.32);
  --panel-fill: linear-gradient(158deg, rgba(16, 26, 60, 0.94), rgba(9, 15, 36, 0.9));

  /* 字体 */
  --font-display: "Arial Narrow", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Songti SC", "Noto Serif CJK SC", "SimSun", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  /* 尺度 */
  --gutter: clamp(16px, 4vw, 48px);
  --shell-max: 1320px;
  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--c-night);
  background-image:
    radial-gradient(1180px 620px at 84% -10%, rgba(76, 141, 255, 0.16), transparent 62%),
    radial-gradient(900px 520px at 6% 2%, rgba(45, 212, 191, 0.10), transparent 60%),
    radial-gradient(760px 440px at 52% 108%, rgba(255, 159, 67, 0.08), transparent 66%);
  color: var(--c-snow);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--c-snow);
  text-wrap: balance;
}
h1 { font-size: clamp(2.1rem, 5vw, 4.25rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.15rem); }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.4rem); }
h4 { font-size: 1rem; letter-spacing: 0.04em; }

p { text-wrap: pretty; }

main { display: block; }

#main-content { display: block; scroll-margin-top: 132px; }
[data-section] { scroll-margin-top: 124px; }

.kicker {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.8125rem;
  letter-spacing: 0.2em;
  color: var(--c-dust);
  margin-bottom: 10px;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- 4. 焦点与可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--c-teal);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -84px;
  z-index: 90;
  padding: 10px 18px;
  border-radius: 0 0 var(--radius-m) var(--radius-m);
  background: var(--c-teal);
  color: #04121c;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: top 0.18s var(--ease);
}
.skip-link:focus { top: 0; }

/* ---------- 5. 布局原语 ---------- */
.wrap {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: 880px; }

.grid { display: grid; gap: clamp(18px, 2.4vw, 32px); }

.grid--split { display: grid; gap: clamp(18px, 2.4vw, 36px); grid-template-columns: minmax(0, 1fr); }

.grid--halves { display: grid; gap: clamp(18px, 2.4vw, 32px); grid-template-columns: minmax(0, 1fr); }

.grid--auto { display: grid; gap: clamp(16px, 2vw, 26px); grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }

.prose {
  max-width: 72ch;
  font-size: 1.0313rem;
  line-height: 1.9;
  color: #DCE3F4;
}
.prose > * + * { margin-top: 1.05em; }
.prose h2 { margin-top: 2.1em; font-size: clamp(1.35rem, 2.2vw, 1.75rem); }
.prose h3 { margin-top: 1.7em; }
.prose ul { list-style: none; display: grid; gap: 0.6em; }
.prose ul li { position: relative; padding-left: 1.35em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-teal);
}
.prose a { color: var(--c-teal); border-bottom: 1px solid rgba(45, 212, 191, 0.45); }
.prose a:hover { border-bottom-color: var(--c-teal); }
.prose strong { color: var(--c-snow); }

/* ---------- 6. 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.8438rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform 0.16s 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:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--c-teal); outline-offset: 3px; }

.btn--primary {
  background: var(--c-ember);
  color: #0A1022;
}
.btn--primary:hover {
  background: #FFB05E;
  box-shadow: 0 8px 24px rgba(255, 159, 67, 0.28);
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--c-snow);
  background: rgba(16, 26, 60, 0.4);
}
.btn--ghost:hover {
  border-color: rgba(45, 212, 191, 0.6);
  color: var(--c-teal);
  background: rgba(45, 212, 191, 0.08);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--c-dust);
  white-space: nowrap;
}
.tag--teal { border-color: rgba(45, 212, 191, 0.5); color: var(--c-teal); }
.tag--ember { border-color: rgba(255, 159, 67, 0.5); color: var(--c-ember); }

/* ---------- 7. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(7, 13, 31, 0.97), rgba(7, 13, 31, 0.9));
  border-bottom: 1px solid var(--line-soft);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}
.site-header[data-scrolled="true"] {
  border-bottom-color: rgba(154, 168, 199, 0.3);
  box-shadow: 0 18px 42px rgba(3, 7, 18, 0.6);
}

/* 遥测轨道 */
.header-rail {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px var(--gutter);
  border-bottom: 1px solid var(--line-faint);
  background-color: rgba(16, 26, 60, 0.42);
  background-image:
    repeating-linear-gradient(90deg, rgba(154, 168, 199, 0.3) 0 1px, transparent 1px 16px),
    linear-gradient(180deg, rgba(16, 26, 60, 0.72), rgba(7, 13, 31, 0));
  background-size: 100% 6px, 100% 100%;
  background-position: left bottom, left top;
  background-repeat: no-repeat;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}
.header-rail__lane {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.header-rail__note {
  color: var(--c-dust);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.header-rail__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--c-mist);
  white-space: nowrap;
}
.header-rail__edition {
  color: var(--c-dust);
  padding: 2px 8px;
  border: 1px solid var(--line-soft);
  border-radius: 4px;
}
.header-rail__divider {
  width: 18px;
  height: 1px;
  background: var(--line-strong);
}
.header-rail__env { color: var(--c-mist); }

/* 经幡五色状态点 */
.flag-dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.flag-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-mist);
  flex: none;
}
.flag-dot--blue { background: var(--c-flag-blue); box-shadow: 0 0 6px rgba(76, 141, 255, 0.7); }
.flag-dot--white { background: var(--c-snow); box-shadow: 0 0 6px rgba(245, 248, 255, 0.5); }
.flag-dot--red { background: var(--c-flag-red); box-shadow: 0 0 6px rgba(242, 100, 106, 0.7); }
.flag-dot--green { background: var(--c-flag-green); box-shadow: 0 0 6px rgba(66, 211, 146, 0.7); }
.flag-dot--yellow { background: var(--c-flag-yellow); box-shadow: 0 0 6px rgba(244, 201, 93, 0.7); }

/* 品牌行 */
.header-main {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 13px var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: none;
  padding: 2px 4px 2px 0;
  border-radius: var(--radius-s);
}
.brand__mark {
  display: grid;
  gap: 4px;
  place-content: center;
  justify-items: center;
  width: 34px;
  height: 34px;
  padding: 0 7px;
  border-radius: 11px;
  border: 1px solid rgba(45, 212, 191, 0.36);
  background: linear-gradient(152deg, rgba(45, 212, 191, 0.22), rgba(76, 141, 255, 0.14));
}
.brand__mark-line {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--c-teal);
}
.brand__mark-line:nth-child(1) { width: 19px; }
.brand__mark-line:nth-child(2) { width: 12px; background: var(--c-ember); }
.brand__mark-line:nth-child(3) { width: 16px; background: var(--c-flag-blue); }
.brand__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  line-height: 1.05;
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1875rem;
  letter-spacing: 0.14em;
  color: var(--c-snow);
}
.brand__descriptor {
  font-family: var(--font-serif);
  font-size: 0.7188rem;
  letter-spacing: 0.2em;
  color: var(--c-dust);
}

/* 栏目索引 */
.site-nav { margin-left: auto; }
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.site-nav__item { display: block; }
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 11px;
  border-radius: var(--radius-s);
  font-size: 0.875rem;
  color: var(--c-dust);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.site-nav__index {
  font-family: var(--font-mono);
  font-size: 0.6563rem;
  letter-spacing: 0.04em;
  color: var(--c-mist);
  transition: color 0.18s var(--ease);
}
.site-nav__label { white-space: nowrap; }
.site-nav__link:hover {
  color: var(--c-snow);
  background: rgba(154, 168, 199, 0.08);
}
.site-nav__link:hover .site-nav__index { color: var(--c-teal); }
.site-nav__link[aria-current="page"] { color: var(--c-snow); }
.site-nav__link[aria-current="page"] .site-nav__index { color: var(--c-teal); }
.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-teal), rgba(45, 212, 191, 0));
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
  margin-left: 4px;
}

/* 移动目录按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  color: var(--c-snow);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}
.nav-toggle:hover { border-color: rgba(45, 212, 191, 0.6); color: var(--c-teal); }
.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.18s var(--ease), opacity 0.18s 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); }
.nav-toggle__label { line-height: 1; }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-teal), var(--c-flag-blue) 55%, var(--c-ember));
  opacity: 0.9;
  transition: transform 0.08s linear;
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  margin-top: clamp(56px, 8vw, 110px);
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(76, 141, 255, 0.15), transparent 62%),
    linear-gradient(180deg, #0A1230, var(--c-night) 62%);
  border-top: 1px solid var(--line-soft);
  color: var(--c-dust);
  font-size: 0.875rem;
}

.footer-top {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  grid-template-columns: minmax(0, 1fr);
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(32px, 5vw, 64px) var(--gutter) clamp(24px, 3vw, 40px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  max-width: 46ch;
}
.footer-brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.625rem;
  letter-spacing: 0.14em;
  color: var(--c-snow);
}
.footer-brand__summary {
  font-family: var(--font-serif);
  font-size: 0.875rem;
  line-height: 1.9;
  color: var(--c-dust);
}
.footer-brand__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: rgba(245, 248, 255, 0.78);
}
.footer-brand .btn { margin-top: 2px; }

.footer-index {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 32px);
}
.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--c-mist);
}
.footer-col__list { display: grid; gap: 10px; }
.footer-col__link {
  display: inline-block;
  font-size: 0.875rem;
  color: rgba(245, 248, 255, 0.82);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.footer-col__link:hover { color: var(--c-teal); border-bottom-color: rgba(45, 212, 191, 0.5); }

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 14px clamp(20px, 4vw, 56px);
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 18px var(--gutter);
  border-top: 1px solid var(--line-faint);
  border-bottom: 1px solid var(--line-faint);
  background: linear-gradient(90deg, rgba(16, 26, 60, 0.62), rgba(7, 13, 31, 0));
}
.footer-contact__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 0.6563rem;
  letter-spacing: 0.18em;
  color: var(--c-mist);
}
.footer-contact__value {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--c-snow);
  overflow-wrap: anywhere;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 16px var(--gutter) 30px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--c-mist);
}
.footer-legal__icp { color: var(--c-dust); }
.footer-legal__meta { margin-left: auto; }

/* ---------- 9. 基础组件 ---------- */
.panel {
  padding: clamp(18px, 2.4vw, 28px);
  border-radius: var(--radius-l);
  border: 1px solid var(--line-soft);
  background: var(--panel-fill);
}
.panel--accent {
  border-color: rgba(45, 212, 191, 0.35);
  box-shadow: inset 0 0 0 1px rgba(45, 212, 191, 0.08);
}

.breadcrumb {
  margin-bottom: clamp(16px, 2vw, 24px);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--c-dust);
}
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumb__link {
  color: var(--c-dust);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.breadcrumb__link:hover { color: var(--c-teal); border-bottom-color: rgba(45, 212, 191, 0.6); }
.breadcrumb__sep { color: var(--c-mist); }
.breadcrumb__current { color: var(--c-snow); }

.data-band {
  display: flex;
  align-items: stretch;
  gap: clamp(18px, 3vw, 44px);
  padding: 16px 2px;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  overflow-x: auto;
  scrollbar-width: thin;
}
.data-band__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: max-content;
}
.data-band__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2.125rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-snow);
}
.data-band__value--teal { color: var(--c-teal); }
.data-band__value--ember { color: var(--c-ember); }
.data-band__label {
  font-size: 0.7188rem;
  letter-spacing: 0.12em;
  color: var(--c-dust);
}

.figure {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
}
.figure__media {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(76, 141, 255, 0.24), transparent 62%),
    radial-gradient(90% 80% at 84% 100%, rgba(255, 159, 67, 0.18), transparent 66%),
    linear-gradient(158deg, #101A3C, #070D1F);
}
.figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure--wide .figure__media { aspect-ratio: 21 / 9; }
.figure--tall .figure__media { aspect-ratio: 4 / 5; }
.figure__caption {
  font-family: var(--font-serif);
  font-size: 0.7813rem;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--c-dust);
}

.toc {
  padding-left: 16px;
  border-left: 1px solid var(--line-soft);
  font-size: 0.8125rem;
}
.toc__list { display: grid; gap: 8px; }
.toc__link {
  display: block;
  padding: 2px 0;
  color: var(--c-dust);
  transition: color 0.16s var(--ease);
}
.toc__link:hover { color: var(--c-snow); }
.toc__link[aria-current="true"] {
  color: var(--c-teal);
  font-weight: 600;
}

/* ---------- 10. 响应式 ---------- */
@media (min-width: 760px) {
  .grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .footer-top { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
}

@media (min-width: 1000px) {
  .grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
}

@media (max-width: 940px) {
  #main-content { scroll-margin-top: 112px; }
  [data-section] { scroll-margin-top: 104px; }

  .nav-toggle { display: inline-flex; }
  .header-actions { margin-left: auto; }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    display: grid;
    margin-left: 0;
    max-height: min(72vh, 540px);
    overflow-y: auto;
    padding: 6px var(--gutter) 20px;
    background: linear-gradient(180deg, #0C1533, var(--c-night));
    border-bottom: 1px solid var(--line-soft);
    box-shadow: 0 26px 52px rgba(3, 7, 18, 0.65);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.16s var(--ease), transform 0.16s var(--ease), visibility 0.16s linear;
  }
  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .site-nav__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 4px;
    border-radius: 0;
    border-bottom: 1px solid var(--line-faint);
    font-size: 0.9375rem;
  }
  .site-nav__link[aria-current="page"]::after {
    left: 0;
    right: auto;
    top: 50%;
    bottom: auto;
    width: 3px;
    height: 18px;
    transform: translateY(-50%);
    background: var(--c-teal);
  }
  .site-nav__item:last-child .site-nav__link { border-bottom: 0; }

  body[data-nav-open="true"] { overflow: hidden; }
}

@media (max-width: 640px) {
  .header-rail__note { font-size: 0.6875rem; }
  .header-rail__env { display: none; }
  .header-rail__divider { display: none; }
  .brand__descriptor { display: none; }
  .brand__name { font-size: 1.0625rem; }
  .footer-index { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-legal { gap: 6px 16px; }
  .footer-legal__meta { margin-left: 0; }
  .prose { font-size: 1rem; }
}

@media (max-width: 560px) {
  .header-actions .btn--primary { display: none; }
}

/* ---------- 11. 减弱动效 ---------- */
@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;
  }
  .site-nav { transform: none !important; }
  .scroll-progress__bar { transition: none !important; }
  .btn:hover,
  .site-nav__link:hover { transform: none !important; }
}