/* ============================================================
   site.css — 宝威赛场 V2.0 / 夜间记分牌
   共享外壳：reset / 变量 / 中文排版 / 轨道导航 / 页脚 / 通用组件
   ============================================================ */

:root {
  --ink-0: #070C18;
  --ink-1: #0D1526;
  --ink-2: #141F33;
  --line: #2A3A57;
  --muted: #8C9BB5;
  --text: #C7D3E6;
  --white: #F2F7FF;
  --green: #3DF2A4;
  --orange: #FF7A33;
  --cyan: #5EC8FF;
  --green-deep: #0F3A2C;

  --rail-w: 88px;
  --rail-w-open: 240px;
  --header-h: 60px;
  --gutter: clamp(18px, 4vw, 52px);

  --font-display: "Oswald", "Barlow Condensed", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Consolas, "Courier New", monospace;

  --shadow-hard: 8px 8px 0 var(--ink-1);
  --shadow-hard-sm: 4px 4px 0 var(--ink-1);
  --grid-lines:
    repeating-linear-gradient(0deg, rgba(140, 155, 181, 0.10) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(90deg, rgba(140, 155, 181, 0.10) 0 1px, transparent 1px 24px);
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  padding-left: var(--rail-w);
  background-color: var(--ink-0);
  background-image:
    radial-gradient(circle at 82% 0%, rgba(20, 31, 51, 0.85) 0%, transparent 46%),
    radial-gradient(circle at 0% 100%, rgba(15, 58, 44, 0.35) 0%, transparent 42%);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

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

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

strong, b { color: var(--white); font-weight: 700; }

::selection { background: var(--green); color: var(--ink-0); }

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

#main-content { display: block; scroll-margin-top: 84px; }

/* ---------- 排版工具 ---------- */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.u-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  flex: 0 0 auto;
  background: var(--green);
}

.hairline {
  height: 2px;
  border: 0;
  margin-block: clamp(32px, 4vw, 56px);
  background: var(--line);
}

.section-head {
  display: flex;
  align-items: flex-end;
  gap: clamp(12px, 2vw, 22px);
  flex-wrap: wrap;
  margin-bottom: clamp(22px, 3vw, 40px);
  padding-bottom: 14px;
  border-bottom: 2px solid var(--line);
}
.section-head__num {
  font-family: var(--font-mono);
  font-size: clamp(40px, 5.4vw, 76px);
  line-height: 0.78;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--line);
}
.section-head__title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.3vw, 28px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--white);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  line-height: 1;
  text-decoration: none;
  box-shadow: var(--shadow-hard-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}
.btn:hover,
.btn:focus-visible {
  transform: translate(4px, 4px);
  box-shadow: 0 0 0 var(--ink-1);
  border-color: var(--cyan);
  color: var(--white);
}
.btn--primary {
  background: var(--green);
  border-color: var(--green);
  color: var(--ink-0);
  font-weight: 700;
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--white);
  border-color: var(--white);
  color: var(--ink-0);
}
.btn--ghost {
  background: transparent;
  border-color: var(--cyan);
  color: var(--cyan);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(94, 200, 255, 0.1);
  border-color: var(--white);
  color: var(--white);
}

/* ---------- 标签 / 状态 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--muted);
  white-space: nowrap;
}
.chip--green { color: var(--green); border-color: var(--green); }
.chip--orange { color: var(--orange); border-color: var(--orange); }
.chip--cyan { color: var(--cyan); border-color: var(--cyan); }

.tag {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--line);
  background: rgba(20, 31, 51, 0.65);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.live-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 10px rgba(61, 242, 164, 0.55);
  vertical-align: middle;
}
@media (prefers-reduced-motion: no-preference) {
  .live-dot { animation: bw-pulse 2.4s ease-in-out infinite; }
}
@keyframes bw-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.82); }
}

/* ---------- 面包屑 ---------- */
.breadcrumbs { padding-block: 20px 0; }
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.breadcrumbs__item { display: flex; align-items: center; gap: 8px; }
.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  color: var(--line);
}
.breadcrumbs__link { color: var(--muted); }
.breadcrumbs__link:hover,
.breadcrumbs__link:focus-visible { color: var(--green); }

/* ---------- 磁贴卡 / 指标 ---------- */
.card {
  position: relative;
  background: var(--ink-2);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  padding: clamp(16px, 2vw, 26px);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.card:hover {
  transform: translate(4px, 4px);
  box-shadow: var(--shadow-hard-sm);
  border-color: var(--cyan);
}
.card__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 2px solid var(--line);
}
.card__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--green);
}
.card__title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.03em;
  line-height: 1.3;
  color: var(--white);
}
.card__body { font-size: 15px; color: var(--text); }

.stat { display: flex; flex-direction: column; gap: 3px; }
.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--white);
}
.stat__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.stat__delta {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}
.stat__delta--up { color: var(--green); }
.stat__delta--down { color: var(--orange); }

/* ---------- 主题筛选按钮组 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 32px);
}
.filter-btn {
  padding: 8px 14px;
  border: 2px solid var(--line);
  background: var(--ink-1);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  line-height: 1.2;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}
.filter-btn:hover { color: var(--white); border-color: var(--cyan); }
.filter-btn[aria-pressed="true"] {
  background: var(--green-deep);
  border-color: var(--green);
  color: var(--green);
}

/* ---------- 图片容器（页面阶段放置占位图） ---------- */
.media {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--line);
  background:
    var(--grid-lines),
    linear-gradient(160deg, var(--ink-2), var(--ink-0));
  background-size: 24px 24px, 24px 24px, 100% 100%;
  box-shadow: var(--shadow-hard);
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: var(--grid-lines);
  background-size: 24px 24px;
  opacity: 0.55;
}
.media--wide { aspect-ratio: 16 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.82) brightness(0.86) contrast(1.05);
}
.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 6px 10px;
  background: rgba(7, 12, 24, 0.88);
  border-top: 2px solid var(--line);
  border-right: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------- 显现与筛选动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
[data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}
.is-entering {
  animation: bw-filter-in 0.28s ease both;
}
@keyframes bw-filter-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* ============================================================
   跳转链接
   ============================================================ */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--green);
  border: 2px solid var(--ink-0);
  color: var(--ink-0);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transform: translateY(-180%);
  transition: transform 0.16s ease;
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  color: var(--ink-0);
}

/* ============================================================
   头部：左侧常驻轨道
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 60;
  width: var(--rail-w);
  background: linear-gradient(180deg, #0A1120 0%, var(--ink-0) 62%);
  border-right: 2px solid var(--line);
  transition: width 0.28s ease, box-shadow 0.28s ease;
}
.site-header:hover,
.site-header:focus-within {
  width: var(--rail-w-open);
  box-shadow: 10px 0 0 rgba(7, 12, 24, 0.6);
}

.rail {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 16px 0 12px;
}

.rail__head {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-inline: 14px;
}

/* 品牌锁 */
.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  overflow: hidden;
  color: var(--white);
  text-decoration: none;
  transition: color 0.18s ease;
}
.brand:hover { color: var(--white); }
.brand__mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--green);
  background: var(--green-deep);
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  box-shadow: 3px 3px 0 rgba(13, 21, 38, 0.9);
}
.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-6px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
}
.brand__name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.2;
  color: var(--white);
}
.brand__desc {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}
.site-header:hover .brand,
.site-header:focus-within .brand { justify-content: flex-start; }
.site-header:hover .brand__text,
.site-header:focus-within .brand__text {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* 移动导航按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 2px solid var(--line);
  background: var(--ink-1);
  color: var(--white);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}
.nav-toggle:hover { border-color: var(--green); }
.nav-toggle__box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
}
.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--green);
  transition: transform 0.22s ease, opacity 0.22s ease;
}
.site-header[data-open] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 轨道主体 */
.rail-body {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
}

/* 主导航 */
.site-nav {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding-block: 14px 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.site-nav::-webkit-scrollbar { width: 3px; }
.site-nav::-webkit-scrollbar-thumb { background: var(--line); }

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.site-nav__item { display: block; }
.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 8px 10px 26px;
  width: 100%;
  color: var(--text);
  text-decoration: none;
  transition: padding 0.24s ease, color 0.18s ease;
}
.site-header:hover .site-nav__link,
.site-header:focus-within .site-nav__link { padding-left: 20px; }

.site-nav__num {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 2px solid var(--line);
  background: var(--ink-1);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  transition: border-color 0.18s ease, color 0.18s ease, background-color 0.18s ease;
}
.site-nav__label {
  font-size: 14px;
  line-height: 1.3;
  letter-spacing: 0.02em;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-4px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
}
.site-header:hover .site-nav__label,
.site-header:focus-within .site-nav__label {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.site-nav__link:hover .site-nav__num,
.site-nav__link:focus-visible .site-nav__num {
  border-color: var(--cyan);
  color: var(--cyan);
}
.site-nav__link:hover .site-nav__label { color: var(--white); }

.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 24px;
  background: var(--green);
  box-shadow: 0 0 12px rgba(61, 242, 164, 0.5);
}
.site-nav__link[aria-current="page"] .site-nav__num {
  border-color: var(--green);
  background: var(--green-deep);
  color: var(--green);
}
.site-nav__link[aria-current="page"] .site-nav__label { color: var(--white); }

/* 轨道底部：赛程时段 + 联络 */
.rail-meta {
  flex: 0 0 auto;
  margin-top: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 14px 8px 4px;
  border-top: 1px solid var(--line);
  margin-inline: 14px;
}
.period-meter {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 100%;
}
.period-meter__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.18s ease, visibility 0.18s ease;
}
.period-meter__items {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.period-meter__item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}
.period-meter__item::before {
  content: "";
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  background: var(--line);
  transition: background-color 0.18s ease, box-shadow 0.18s ease;
}
.period-meter__item[data-active="true"]::before {
  background: var(--green);
  box-shadow: 0 0 10px rgba(61, 242, 164, 0.65);
}
.period-meter__item[data-active="true"] { color: var(--green); }
.period-meter__name {
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.18s ease, visibility 0.18s ease;
}
.site-header:hover .period-meter__label,
.site-header:focus-within .period-meter__label,
.site-header:hover .period-meter__name,
.site-header:focus-within .period-meter__name {
  opacity: 1;
  visibility: visible;
}
.site-header:hover .period-meter__items,
.site-header:focus-within .period-meter__items { align-items: flex-start; }
.site-header:hover .rail-meta,
.site-header:focus-within .rail-meta { align-items: flex-start; }

.rail-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  overflow: hidden;
  border: 2px solid var(--line);
  background: var(--ink-1);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  white-space: nowrap;
  text-decoration: none;
  transition: width 0.24s ease, border-color 0.18s ease, color 0.18s ease;
}
.rail-link::before { content: "↗"; color: var(--green); }
.site-header:hover .rail-link,
.site-header:focus-within .rail-link {
  width: auto;
  padding-inline: 12px;
  gap: 8px;
  border-color: var(--green);
  color: var(--white);
}
.site-header:hover .rail-link::before,
.site-header:focus-within .rail-link::before { content: "↗ "; }
.rail-link:hover { border-color: var(--green); color: var(--white); }

/* 滚动进度尺 */
.rail-progress {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 3px;
  background: rgba(42, 58, 87, 0.45);
  pointer-events: none;
}
.rail-progress__bar {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--green);
  transform: scaleY(0);
  transform-origin: top center;
  box-shadow: 0 0 12px rgba(61, 242, 164, 0.5);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 8vw, 128px);
  border-top: 2px solid var(--line);
  background: linear-gradient(180deg, var(--ink-1), var(--ink-0));
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--grid-lines);
  background-size: 24px 24px;
  opacity: 0.5;
  pointer-events: none;
}
.footer__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
  padding-block: clamp(40px, 5vw, 76px) clamp(26px, 3vw, 40px);
}
.footer__brand { display: flex; flex-direction: column; gap: 16px; }
.footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  text-decoration: none;
}
.footer__logo:hover { color: var(--white); }
.footer__logo-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 2px solid var(--green);
  background: var(--green-deep);
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.footer__logo-text {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 800;
  letter-spacing: 0.06em;
}
.footer__summary {
  max-width: 32ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}
.footer__contact {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 2;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}
.footer__col { min-width: 0; }
.footer__title {
  padding-bottom: 8px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.footer__list { display: flex; flex-direction: column; gap: 9px; }
.footer__link {
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  text-decoration: none;
  transition: color 0.16s ease, padding-left 0.16s ease;
}
.footer__link:hover,
.footer__link:focus-visible {
  color: var(--green);
  padding-left: 4px;
}
.footer__bottom {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 18px 26px;
  border-top: 1px solid var(--line);
}
.footer__legal {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.footer__top-btn {
  padding: 9px 14px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  transition: border-color 0.16s ease, color 0.16s ease, transform 0.16s ease;
}
.footer__top-btn:hover,
.footer__top-btn:focus-visible {
  border-color: var(--green);
  color: var(--green);
  transform: translateY(-2px);
}

/* ============================================================
   平板
   ============================================================ */
@media (max-width: 1080px) {
  .footer__grid { grid-template-columns: minmax(0, 1fr); }
  .footer__summary { max-width: 46ch; }
}

/* ============================================================
   移动端：轨道 → 顶部条 + 抽屉
   ============================================================ */
@media (max-width: 900px) {
  body {
    padding-left: 0;
    padding-top: var(--header-h);
  }

  .site-header,
  .site-header:hover,
  .site-header:focus-within {
    top: 0;
    right: 0;
    left: 0;
    bottom: auto;
    width: auto;
    height: var(--header-h);
    box-shadow: none;
    border-right: 0;
    border-bottom: 2px solid var(--line);
    background: rgba(10, 17, 32, 0.97);
  }

  .rail {
    flex-direction: row;
    align-items: center;
    height: var(--header-h);
    padding: 0;
  }

  .rail__head {
    position: relative;
    z-index: 65;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    width: 100%;
    padding: 0 14px;
    margin: 0;
    border-bottom: 0;
  }

  .brand,
  .site-header:hover .brand,
  .site-header:focus-within .brand {
    justify-content: flex-start;
    width: auto;
    gap: 10px;
  }

  .brand__mark {
    width: 36px;
    height: 36px;
    font-size: 12px;
  }

  .brand__text,
  .site-header:hover .brand__text,
  .site-header:focus-within .brand__text {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .brand__name { font-size: 16px; }
  .brand__desc { font-size: 9px; }

  .nav-toggle { display: flex; }

  /* 抽屉 */
  .rail-body {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 55;
    width: min(320px, 86vw);
    padding-top: calc(var(--header-h) + 12px);
    background: var(--ink-1);
    border-right: 2px solid var(--line);
    box-shadow: 12px 0 0 rgba(7, 12, 24, 0.55);
    transform: translateX(-102%);
    transition: transform 0.26s ease;
    overflow-y: auto;
  }
  .site-header[data-open] .rail-body { transform: translateX(0); }

  .site-nav { padding-block: 6px 10px; overflow: visible; }

  .site-nav__link,
  .site-header:hover .site-nav__link,
  .site-header:focus-within .site-nav__link {
    padding: 11px 16px 11px 18px;
    gap: 12px;
  }

  .site-nav__label,
  .site-header:hover .site-nav__label,
  .site-header:focus-within .site-nav__label {
    opacity: 1;
    visibility: visible;
    transform: none;
    font-size: 15px;
  }

  .rail-meta,
  .site-header:hover .rail-meta,
  .site-header:focus-within .rail-meta {
    align-items: stretch;
    margin-inline: 16px;
    padding: 14px 0 20px;
    gap: 12px;
  }

  .period-meter { align-items: flex-start; }
  .period-meter__label {
    opacity: 1;
    visibility: visible;
  }
  .period-meter__items,
  .site-header:hover .period-meter__items,
  .site-header:focus-within .period-meter__items {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
  }
  .period-meter__name {
    opacity: 1;
    visibility: visible;
  }

  .rail-link,
  .site-header:hover .rail-link,
  .site-header:focus-within .rail-link {
    width: 100%;
    height: 40px;
    padding-inline: 12px;
    justify-content: flex-start;
    gap: 8px;
  }

  .rail-progress { display: none; }

  .footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  .section-head__num { font-size: clamp(36px, 9vw, 54px); }
}

@media (max-width: 520px) {
  :root { --gutter: 16px; }
  .footer__cols { grid-template-columns: minmax(0, 1fr); }
  .footer__summary { max-width: none; }
  .card { box-shadow: 5px 5px 0 var(--ink-1); }
  .media { box-shadow: 5px 5px 0 var(--ink-1); }
}

/* ============================================================
   降低动效
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition-property: opacity, color, background-color, border-color !important;
    transition-duration: 0.12s !important;
    transition-delay: 0s !important;
  }
  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
  .site-header { transition: none; }
  .rail-body { transition: none; }
}