/* ===== 爱体育看台 · 共享样式 /assets/site.css ===== */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ol, ul { margin: 0; }
ol, ul { padding: 0; list-style: none; }
img, svg, video { max-width: 100%; }
img { display: block; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-deep: #06140F;
  --ink-carbon: #0B0E0C;
  --ink-turf: #143228;
  --line-blue: #2C4A3F;
  --neon: #46E3A4;
  --amber: #FFA23A;
  --coral: #FF6A4D;
  --chalk: #ECF5EF;
  --mist: #9BB3A7;
  --paper: #F1EFE4;
  --paper-ink: #10231C;

  --font-title: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-data: "Barlow Condensed", "Oswald", "Arial Narrow", sans-serif;
  --font-num: "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;
  --font-body: "Noto Sans SC", system-ui, "PingFang SC", sans-serif;

  --r-s: 6px;
  --r-m: 14px;
  --r-l: 26px;
  --r-pill: 999px;

  --gap-xs: .5rem;
  --gap-s: .85rem;
  --gap-m: 1.25rem;
  --gap-l: 2rem;
  --gap-xl: 3.25rem;

  --rule: 1px solid var(--line-blue);
  --dur: 180ms;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --page-max: 1200px;
  --shell-max: 1400px;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background: var(--ink-deep);
  color: var(--chalk);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.05vw, 16.5px);
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-title);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.22;
  color: var(--chalk);
}
h1 { font-size: clamp(30px, 4.2vw, 56px); }
h2 { font-size: clamp(20px, 2.6vw, 26px); }
h3 { font-size: clamp(17px, 1.6vw, 20px); }

p { line-height: 1.75; }
strong { color: var(--chalk); }

::selection { background: rgba(70, 227, 164, .28); color: var(--chalk); }

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

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2.2rem);
}

.section { padding-block: clamp(2rem, 4.5vw, 3.5rem); }
.section--tight { padding-block: clamp(1.25rem, 3vw, 2rem); }

.stack { display: grid; gap: var(--gap, var(--gap-m)); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem; }

.grid12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(.75rem, 2vw, 1.5rem);
}
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: 1 / -1; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: start;
}

@media (max-width: 900px) {
  .grid12 { grid-template-columns: 1fr; }
  .grid12 > [class*="span-"] { grid-column: 1 / -1; }
  .split { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 5. 通用容器与装饰 ---------- */
.panel {
  background: var(--ink-carbon);
  border: var(--rule);
  border-radius: var(--r-m);
  padding: clamp(1rem, 2.2vw, 1.6rem);
}
.panel--turf { background: var(--ink-turf); }
.panel--paper { background: var(--paper); color: var(--paper-ink); border-color: transparent; }
.panel--paper h1, .panel--paper h2, .panel--paper h3, .panel--paper strong { color: var(--paper-ink); }
.panel--paper a { color: #0B5A40; }

.rule { height: 1px; border: 0; margin: 0; background: var(--line-blue); }

.tick-scale {
  height: 9px;
  background-image: repeating-linear-gradient(90deg, var(--line-blue) 0 1px, transparent 1px 12px);
}

.blueprint-grid {
  background-image:
    linear-gradient(rgba(44, 74, 63, .55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44, 74, 63, .55) 1px, transparent 1px);
  background-size: 72px 72px;
}

.grid-label {
  font-family: var(--font-num);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
  opacity: .85;
}

.has-blob { position: relative; isolation: isolate; }
.blob {
  position: absolute;
  width: clamp(140px, 22vw, 320px);
  aspect-ratio: 1;
  border-radius: 62% 38% 47% 53% / 45% 55% 45% 55%;
  background: radial-gradient(circle at 35% 30%, rgba(70, 227, 164, .28), rgba(20, 50, 40, .05) 70%);
  pointer-events: none;
  z-index: -1;
}

.slant-divider {
  height: clamp(24px, 4vw, 52px);
  background: var(--ink-turf);
  border-top: var(--rule);
  clip-path: polygon(0 0, 100% 62%, 100% 100%, 0 100%);
}

/* ---------- 6. 按钮 / 链接 / 标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-family: var(--font-data);
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: .6rem 1rem;
  border: 1px solid var(--line-blue);
  border-radius: var(--r-pill);
  color: var(--chalk);
  background: transparent;
  text-decoration: none;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.btn:hover { border-color: var(--neon); color: var(--neon); }

.btn--primary {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--ink-deep);
}
.btn--primary:hover { background: transparent; color: var(--neon); }

.btn--ghost { border-style: dashed; }
.btn--ghost:hover { border-style: solid; }

.btn--amber { border-color: var(--amber); color: var(--amber); }
.btn--amber:hover { background: var(--amber); color: var(--ink-deep); }

.btn--sm { padding: .4rem .75rem; font-size: .7rem; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(70, 227, 164, .35);
  padding-bottom: 2px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.link-arrow::after { content: "→"; }
.link-arrow:hover { border-bottom-color: var(--neon); transform: translateX(2px); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-family: var(--font-data);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: .25rem .6rem;
  border: 1px solid var(--line-blue);
  border-radius: var(--r-pill);
  color: var(--chalk);
  background: rgba(236, 245, 239, .03);
}
.tag--live { border-color: var(--neon); color: var(--neon); background: rgba(70, 227, 164, .09); }
.tag--key { border-color: var(--amber); color: var(--amber); background: rgba(255, 162, 58, .1); }
.tag--alert { border-color: var(--coral); color: var(--coral); background: rgba(255, 106, 77, .1); }

.stat { display: grid; gap: .3rem; }
.stat__value {
  font-family: var(--font-num);
  font-size: clamp(28px, 4vw, 64px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--chalk);
  font-variant-numeric: tabular-nums;
}
.stat__label {
  font-family: var(--font-data);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}
.stat--key .stat__value { color: var(--amber); }
.stat--live .stat__value { color: var(--neon); }

/* ---------- 7. 内容型组件 ---------- */
.page-head { padding: clamp(2rem, 5vw, 4rem) 0 clamp(1.25rem, 3vw, 2.25rem); }
.page-head__code {
  display: inline-block;
  font-family: var(--font-num);
  font-size: .78rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--neon);
}
.page-head__title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(30px, 4.2vw, 56px);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: .55rem 0 .8rem;
}
.page-head__lede {
  max-width: 42ch;
  color: var(--mist);
  line-height: 1.75;
}

.prose {
  max-width: 38em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--chalk);
}
.prose h2, .prose h3 { margin: 1.6em 0 .6em; }
.prose p { margin: 0 0 1em; }
.prose ul, .prose ol { padding-left: 1.25em; margin: 0 0 1em; }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li { margin: .35em 0; }
.prose a { color: var(--neon); text-decoration: underline; text-underline-offset: 3px; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .35rem .6rem;
  margin: 0 0 1.25rem;
  font-family: var(--font-data);
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mist);
}
.breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.breadcrumb a:hover { color: var(--neon); border-bottom-color: var(--neon); }
.breadcrumb__sep { color: var(--line-blue); }
.breadcrumb [aria-current="page"] { color: var(--chalk); }

.band {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(.75rem, 2vw, 1.5rem);
  background: var(--ink-turf);
  border: var(--rule);
  border-radius: var(--r-m);
  padding: .85rem clamp(.85rem, 2vw, 1.35rem);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.band:hover { background: var(--ink-carbon); border-color: var(--neon); }
.band__index { font-family: var(--font-num); font-size: .74rem; color: var(--neon); letter-spacing: .08em; }
.band__title { font-family: var(--font-title); font-weight: 800; font-size: clamp(15px, 1.7vw, 19px); margin: 0; }
.band__meta {
  font-family: var(--font-data);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}

.figure-note {
  display: grid;
  gap: .2rem;
  padding: .35rem 0 .35rem .7rem;
  border-left: 2px solid var(--line-blue);
  font-size: .8rem;
  color: var(--mist);
}
.figure-note__key {
  font-family: var(--font-data);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--neon);
}

.timeline { display: grid; gap: 0; }
.timeline__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem 0;
  border-top: var(--rule);
}
.timeline__time {
  font-family: var(--font-num);
  font-size: .85rem;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.details-panel {
  background: var(--ink-carbon);
  border: var(--rule);
  border-radius: var(--r-s);
  overflow: clip;
}
.details-panel > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .75rem 1rem;
  font-family: var(--font-data);
  letter-spacing: .08em;
  cursor: pointer;
  list-style: none;
}
.details-panel > summary::-webkit-details-marker { display: none; }
.details-panel > summary::after {
  content: "+";
  font-family: var(--font-num);
  color: var(--neon);
}
.details-panel[open] > summary::after { content: "–"; }
.details-panel__body {
  padding: .9rem 1rem 1.1rem;
  border-top: var(--rule);
  color: var(--mist);
}
.details-panel__body p { margin: 0 0 .8em; }
.details-panel__body p:last-child { margin-bottom: 0; }

/* 图片容器：页面阶段放入 <img> 与 .image-frame__caption */
.image-frame {
  position: relative;
  display: block;
  overflow: clip;
  border: var(--rule);
  border-radius: var(--r-m);
  background: linear-gradient(135deg, var(--ink-turf), var(--ink-carbon));
}
.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}
.image-frame--tall img { aspect-ratio: 3 / 4; }
.image-frame--wide img { aspect-ratio: 21 / 9; }
.image-frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(236, 245, 239, .12);
  border-radius: calc(var(--r-m) - 6px);
  pointer-events: none;
  transition: border-color var(--dur) var(--ease);
}
.image-frame:hover::after { border-color: rgba(70, 227, 164, .45); }
.image-frame__caption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .5rem .9rem;
  padding: .6rem .85rem;
  border-top: var(--rule);
  font-size: .78rem;
  color: var(--mist);
}
.image-frame__caption em {
  font-style: normal;
  font-family: var(--font-num);
  color: var(--neon);
}

.index-rail {
  position: fixed;
  top: 50%;
  right: clamp(.5rem, 1.4vw, 1.25rem);
  transform: translateY(-50%);
  z-index: 40;
  display: grid;
  gap: .45rem;
  padding: .7rem .5rem;
  background: rgba(6, 20, 15, .72);
  border: var(--rule);
  border-radius: var(--r-pill);
  font-family: var(--font-num);
  font-size: .68rem;
}
.index-rail a {
  display: grid;
  place-items: center;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.index-rail a:hover { color: var(--ink-deep); background: var(--neon); }
.index-rail a[aria-current="true"] { color: var(--neon); background: rgba(70, 227, 164, .12); }
@media (max-width: 1120px) { .index-rail { display: none; } }

/* ---------- 8. 头部 ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -4.5rem;
  z-index: 120;
  padding: .6rem 1rem;
  background: var(--neon);
  color: var(--ink-deep);
  border-radius: 0 0 8px 8px;
  font-family: var(--font-data);
  letter-spacing: .12em;
  text-transform: uppercase;
  text-decoration: none;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink-deep);
  border-bottom: var(--rule);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.site-header[data-scrolled] {
  background: var(--ink-carbon);
  box-shadow: 0 14px 34px -26px rgba(0, 0, 0, .95);
}

.site-header__inner {
  max-width: var(--shell-max);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: clamp(.6rem, 2vw, 1.5rem);
  padding: .55rem clamp(1rem, 3vw, 2.2rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  flex: 0 0 auto;
  padding: .2rem 0;
  text-decoration: none;
}
.brand__mark {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  font-family: var(--font-num);
  font-size: .78rem;
  color: var(--ink-deep);
  background: var(--neon);
  border-radius: 52% 48% 44% 56% / 46% 54% 46% 54%;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.brand:hover .brand__mark { background: var(--amber); transform: rotate(-6deg); }
.brand__text { display: grid; line-height: 1.15; }
.brand__name {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: .01em;
  color: var(--chalk);
}
.brand__tagline { font-size: .7rem; letter-spacing: .06em; color: var(--mist); }

.cmdbar {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: clamp(.5rem, 1.5vw, 1.25rem);
}
.cmdbar__list {
  display: flex;
  align-items: center;
  gap: .15rem;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.cmdbar__list::-webkit-scrollbar { display: none; }
.cmdbar__item { flex: 0 0 auto; }
.cmdbar__link {
  display: inline-flex;
  align-items: baseline;
  gap: .35rem;
  padding: .45rem .6rem;
  border: 1px solid transparent;
  border-radius: var(--r-s);
  font-size: .86rem;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.cmdbar__index {
  font-family: var(--font-num);
  font-size: .66rem;
  color: var(--line-blue);
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.cmdbar__label { white-space: nowrap; }
.cmdbar__link:hover { color: var(--chalk); border-color: var(--neon); }
.cmdbar__link:hover .cmdbar__index { color: var(--neon); }
.cmdbar__link[aria-current="page"] {
  color: var(--chalk);
  border-color: var(--line-blue);
  background: linear-gradient(180deg, transparent 62%, rgba(70, 227, 164, .18));
}
.cmdbar__link[aria-current="page"] .cmdbar__index { color: var(--neon); }

.cmdbar__utility { display: flex; align-items: center; gap: .5rem; flex: 0 0 auto; }
.util-link {
  font-family: var(--font-data);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
  text-decoration: none;
  padding: .32rem .6rem;
  border: 1px dashed var(--line-blue);
  border-radius: var(--r-pill);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.util-link:hover { color: var(--neon); border-color: var(--neon); border-style: solid; }

.site-header__side { display: flex; align-items: center; gap: .7rem; flex: 0 0 auto; }
.status-light {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-num);
  font-size: .7rem;
  letter-spacing: .04em;
  color: var(--mist);
}
.status-light__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 3px rgba(70, 227, 164, .15);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .45rem .75rem;
  border: 1px solid var(--line-blue);
  border-radius: var(--r-pill);
  font-family: var(--font-data);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--chalk);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--neon); color: var(--neon); }
.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }
.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: var(--neon);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

.header-progress { height: 2px; overflow: hidden; }
.header-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--neon), var(--amber));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 90ms linear;
}

.header-strip { background: var(--ink-carbon); border-top: var(--rule); }
.header-strip__inner {
  max-width: var(--shell-max);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: clamp(.9rem, 3vw, 2.25rem);
  padding: .4rem clamp(1rem, 3vw, 2.2rem);
  overflow-x: auto;
  scrollbar-width: none;
}
.header-strip__inner::-webkit-scrollbar { display: none; }
.header-strip__tick {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-size: .68rem;
  letter-spacing: .06em;
  color: var(--mist);
  white-space: nowrap;
}
.header-strip__tick::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: .45rem;
  background: var(--neon);
  border-radius: 1px;
  transform: translateY(-1px);
}
.site-header[data-scrolled] .header-strip { display: none; }

@media (max-width: 1080px) {
  .site-header__side .status-light { display: none; }
}

@media (max-width: 900px) {
  .site-header__side { display: none; }
  .nav-toggle { display: inline-flex; margin-left: auto; }
  .site-header[data-open] { background: var(--ink-carbon); }
  .cmdbar {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: .5rem clamp(1rem, 3vw, 2.2rem) 1.1rem;
    background: var(--ink-carbon);
    border-top: var(--rule);
    border-bottom: var(--rule);
    max-height: min(76vh, 560px);
    overflow-y: auto;
  }
  .site-header[data-open] .cmdbar { display: flex; }
  .cmdbar__list { flex-direction: column; align-items: stretch; gap: 0; overflow: visible; }
  .cmdbar__item { border-bottom: 1px solid rgba(44, 74, 63, .55); }
  .cmdbar__link {
    padding: .85rem .2rem;
    font-size: 1rem;
    border-radius: 0;
    border-color: transparent;
  }
  .cmdbar__link[aria-current="page"] { background: linear-gradient(90deg, rgba(70, 227, 164, .16), transparent); }
  .cmdbar__index { font-size: .72rem; color: var(--neon); }
  .cmdbar__utility { flex-direction: column; align-items: stretch; gap: .4rem; margin-top: 1rem; }
  .util-link {
    border: 1px solid transparent;
    border-bottom-color: var(--line-blue);
    border-radius: var(--r-s);
    padding: .6rem .2rem;
  }
  .header-strip { display: none; }
}

@media (max-width: 600px) {
  .brand__tagline { display: none; }
  .cmdbar__link { font-size: .95rem; }
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  margin-top: clamp(3rem, 7vw, 5.5rem);
  background: var(--ink-carbon);
  border-top: var(--rule);
  color: var(--mist);
  font-size: .86rem;
}
.site-footer::before {
  content: "";
  display: block;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--line-blue) 0 1px, transparent 1px 14px);
}

.footer-grid {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(1.75rem, 4vw, 3rem) clamp(1rem, 3vw, 2.2rem) clamp(1.25rem, 3vw, 2rem);
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.footer-brand { display: grid; gap: .6rem; align-content: start; max-width: 36ch; }
.footer-brand__name {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -.01em;
  color: var(--chalk);
}
.footer-brand__tagline {
  font-family: var(--font-data);
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--neon);
}
.footer-contact {
  font-family: var(--font-num);
  font-size: .78rem;
  color: var(--chalk);
  word-break: break-word;
}
.footer-address { color: var(--mist); }
.footer-note { font-size: .78rem; line-height: 1.7; color: var(--mist); }

.footer-col { display: grid; gap: .75rem; align-content: start; }
.footer-col__title {
  font-family: var(--font-data);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--chalk);
  padding-bottom: .5rem;
  border-bottom: var(--rule);
}
.footer-list { display: grid; gap: .45rem; }
.footer-list a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-list a:hover { color: var(--neon); border-bottom-color: var(--neon); }

.footer-legal {
  max-width: var(--shell-max);
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem 1.25rem;
  padding: 1rem clamp(1rem, 3vw, 2.2rem) 1.75rem;
  border-top: var(--rule);
  font-family: var(--font-num);
  font-size: .72rem;
  color: var(--mist);
}
.footer-legal__copy { margin-right: auto; }
.footer-legal__icp { color: var(--mist); }
.footer-legal__links { display: flex; flex-wrap: wrap; gap: 1rem; }
.footer-legal__links a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line-blue);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-legal__links a:hover { color: var(--neon); border-bottom-color: var(--neon); }

@media (max-width: 880px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- 10. 显现与降级 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .link-arrow:hover { transform: none; }
  .brand:hover .brand__mark { transform: none; }
  .header-progress__bar { transition: none; }
}