/* =========================================================
   雷竞技赛事 · 共享样式 /assets/site.css
   1 reset  2 tokens  3 基础排版  4 通用组件  5 header  6 footer
   7 响应式  8 可访问性
   ========================================================= */

/* ---------- 1. reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; overflow-x: hidden; }
h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; }
img, svg, video { display: block; max-width: 100%; }
h1, h2, h3, h4 { text-wrap: balance; }

/* ---------- 2. tokens ---------- */
:root {
  --ink-950: #020A14;
  --ink-900: #061426;
  --ink-800: #0B223D;
  --cyan: #22D3EE;
  --cyan-soft: rgba(34, 211, 238, .14);
  --orange: #FF8A3D;
  --violet: #A78BFA;
  --mist: #E6F7FF;
  --silver: #9FB3C8;
  --green: #34D399;
  --yellow: #FBBF24;

  --line: rgba(230, 247, 255, .12);
  --line-soft: rgba(230, 247, 255, .07);
  --glass: rgba(11, 34, 61, .55);
  --glass-strong: rgba(8, 26, 47, .92);

  --shell: 1240px;
  --rail-w: 196px;
  --rail-gap: 240px;
  --header-space: 104px;
  --radius: 16px;

  --font-display: "Noto Sans SC", "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", SFMono-Regular, ui-monospace, "Courier New", monospace;

  --ease: cubic-bezier(.22, .7, .28, 1);
  --t-fast: 180ms;
  --t-mid: 240ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  letter-spacing: .01em;
  color: var(--mist);
  background:
    radial-gradient(920px 540px at 84% -10%, rgba(34, 211, 238, .17), transparent 62%),
    radial-gradient(780px 480px at 4% 102%, rgba(167, 139, 250, .14), transparent 62%),
    linear-gradient(180deg, #061426 0%, #051120 48%, #020A14 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 6rem);
  font-weight: 900;
  line-height: .96;
  letter-spacing: -.02em;
}
h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 3.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.01em;
}
h3 {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 1.6vw, 1.5rem);
  font-weight: 700;
  line-height: 1.35;
}
p { text-wrap: pretty; }

main { display: block; padding-top: var(--header-space); padding-bottom: clamp(24px, 4vw, 48px); }

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 40px);
}

.mono { font-family: var(--font-mono); letter-spacing: .06em; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(34, 211, 238, 0));
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: clamp(22px, 3vw, 38px);
}

.section-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  line-height: .85;
  letter-spacing: -.03em;
  color: rgba(34, 211, 238, .2);
  -webkit-text-stroke: 1px rgba(34, 211, 238, .55);
}

.vertical-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--silver);
}

.divider {
  height: 1px;
  border: 0;
  margin: clamp(30px, 4vw, 56px) 0;
  background: linear-gradient(90deg, rgba(34, 211, 238, .45), rgba(167, 139, 250, .3) 46%, transparent 100%);
}

/* ---------- 4. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-size: .92rem;
  font-weight: 700;
  letter-spacing: .02em;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease);
}
.btn--primary {
  background: linear-gradient(118deg, var(--orange), #FF6B2E);
  color: #200D02;
  box-shadow: 0 14px 30px -16px rgba(255, 138, 61, .95);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 20px 38px -16px rgba(255, 138, 61, 1); }
.btn--ghost {
  background: rgba(230, 247, 255, .045);
  border-color: var(--line);
  color: var(--mist);
}
.btn--ghost:hover { border-color: rgba(34, 211, 238, .55); color: #fff; transform: translateY(-2px); }
.btn--cyan { background: var(--cyan); color: #031722; box-shadow: 0 14px 30px -18px rgba(34, 211, 238, .9); }
.btn--cyan:hover { transform: translateY(-2px); }
.btn--sm { padding: 9px 17px; font-size: .82rem; }
.btn--block { width: 100%; }

.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(11, 34, 61, .94), rgba(6, 20, 38, .94));
  transition: border-color var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}
.card:hover {
  border-color: rgba(34, 211, 238, .38);
  box-shadow: 0 24px 48px -34px rgba(34, 211, 238, .8);
}
.card--glass {
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
}
.card--cut {
  border-radius: var(--radius) 0 var(--radius) var(--radius);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(230, 247, 255, .04);
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: .64rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  white-space: nowrap;
}
.tag--cyan { color: #9BEEFF; border-color: rgba(34, 211, 238, .45); background: rgba(34, 211, 238, .12); }
.tag--orange { color: #FFC79C; border-color: rgba(255, 138, 61, .45); background: rgba(255, 138, 61, .12); }
.tag--violet { color: #CFC2FF; border-color: rgba(167, 139, 250, .45); background: rgba(167, 139, 250, .12); }
.tag--green { color: #A7F3D0; border-color: rgba(52, 211, 153, .45); background: rgba(52, 211, 153, .12); }
.tag--yellow { color: #FDE68A; border-color: rgba(251, 191, 36, .45); background: rgba(251, 191, 36, .12); }

.stat { display: flex; flex-direction: column; gap: 6px; }
.stat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--mist);
}
.stat__label {
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--silver);
  text-transform: uppercase;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--silver);
}
.breadcrumbs a { color: var(--silver); transition: color var(--t-fast) var(--ease); }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs li { display: inline-flex; align-items: center; }
.breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(159, 179, 200, .45);
}
.breadcrumbs [aria-current] { color: var(--mist); }

.prose {
  max-width: 72ch;
  font-size: 1.02rem;
  line-height: 1.85;
  color: #CBE3F4;
}
.prose > * + * { margin-top: 1.1em; }
.prose h2, .prose h3 { color: var(--mist); margin-top: 2em; }
.prose strong { color: #fff; font-weight: 700; }
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(34, 211, 238, .4); }
.prose a:hover { border-bottom-color: var(--cyan); }
.prose ul li {
  position: relative;
  padding-left: 22px;
}
.prose ul li + li { margin-top: .5em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(34, 211, 238, .2), rgba(6, 20, 38, .92) 46%, rgba(167, 139, 250, .24)),
    var(--ink-900);
}
.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(90deg, rgba(230, 247, 255, .06) 0 1px, transparent 1px 30px);
  opacity: .7;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.grid { display: grid; gap: clamp(14px, 2vw, 24px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; }
.filter-btn {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(230, 247, 255, .04);
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease);
}
.filter-btn:hover { color: var(--mist); border-color: rgba(34, 211, 238, .5); transform: translateY(-1px); }
.filter-btn[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #031722;
}

.is-hidden { display: none !important; }

html.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
html.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 5. header ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--cyan);
  color: #031722;
  font-weight: 700;
  font-size: .88rem;
  transform: translateY(-160%);
  transition: transform var(--t-fast) var(--ease);
}
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--mist);
  outline-offset: 3px;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 150;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 58%, var(--orange));
  box-shadow: 0 0 14px rgba(34, 211, 238, .7);
  pointer-events: none;
}

.site-header {
  position: fixed;
  inset: 0;
  z-index: 80;
  pointer-events: none;
}

.brand-island {
  position: fixed;
  top: 14px;
  left: 14px;
  right: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(11, 34, 61, .62);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  backdrop-filter: blur(20px) saturate(150%);
  box-shadow: 0 22px 44px -32px rgba(2, 10, 20, .95);
  pointer-events: auto;
  transition: background-color var(--t-mid) var(--ease),
              border-color var(--t-mid) var(--ease),
              box-shadow var(--t-mid) var(--ease);
}
.site-header[data-scrolled] .brand-island {
  background: rgba(6, 20, 38, .88);
  border-color: rgba(34, 211, 238, .26);
  box-shadow: 0 24px 48px -30px rgba(0, 0, 0, 1);
}

.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }
.brand__mark {
  flex: none;
  width: 34px;
  height: 34px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  align-items: end;
  padding: 7px;
  border-radius: 10px;
  border: 1px solid rgba(34, 211, 238, .34);
  background: linear-gradient(150deg, rgba(34, 211, 238, .24), rgba(167, 139, 250, .2));
}
.brand__mark i { display: block; width: 100%; border-radius: 2px; background: var(--cyan); }
.brand__mark i:nth-child(1) { height: 42%; }
.brand__mark i:nth-child(2) { height: 84%; background: var(--orange); }
.brand__mark i:nth-child(3) { height: 62%; background: rgba(230, 247, 255, .8); }

.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: .05em;
  line-height: 1.24;
  color: var(--mist);
}
.brand__line {
  display: block;
  font-family: var(--font-mono);
  font-size: .58rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--silver);
  white-space: nowrap;
}

.island-meta {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--silver);
  white-space: nowrap;
}
.island-meta__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(52, 211, 153, .16);
}
.island-meta__sep { color: rgba(159, 179, 200, .45); }

.island-cta { flex: none; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 9px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(230, 247, 255, .05);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: .64rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  cursor: pointer;
  pointer-events: auto;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: rgba(34, 211, 238, .55); color: #fff; }
.nav-toggle__bars { display: grid; gap: 4px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child { transform: translateY(-3px) rotate(-45deg); }

.rail {
  position: fixed;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: var(--rail-w);
  padding: 14px 12px 12px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: var(--glass);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  backdrop-filter: blur(20px) saturate(150%);
  box-shadow: 0 26px 60px -44px rgba(2, 10, 20, .95);
  pointer-events: auto;
  transition: opacity var(--t-mid) var(--ease),
              transform var(--t-mid) var(--ease),
              border-color var(--t-mid) var(--ease),
              visibility var(--t-mid) var(--ease);
}
.rail__title {
  padding: 2px 10px 10px;
  font-family: var(--font-mono);
  font-size: .58rem;
  font-weight: 600;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--silver);
}
.rail__list { display: flex; flex-direction: column; gap: 2px; }
.rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 12px;
  color: var(--silver);
  font-size: .92rem;
  font-weight: 500;
  transition: color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}
.rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  border-radius: 2px;
  background: var(--cyan);
  transform: translateY(-50%);
  transition: height var(--t-fast) var(--ease);
}
.rail__num {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .08em;
  color: rgba(159, 179, 200, .62);
  transition: color var(--t-fast) var(--ease);
}
.rail__label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rail__link:hover { color: var(--mist); background: rgba(230, 247, 255, .05); }
.rail__link:hover .rail__num { color: var(--cyan); }
.rail__link[aria-current="page"] {
  color: #fff;
  background: linear-gradient(90deg, rgba(34, 211, 238, .18), rgba(34, 211, 238, 0));
}
.rail__link[aria-current="page"]::before { height: 20px; }
.rail__link[aria-current="page"] .rail__num { color: var(--cyan); }
.rail__foot {
  margin-top: 12px;
  padding: 11px 10px 2px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .56rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(159, 179, 200, .55);
}

.quickbar {
  display: none;
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 90;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  padding: 8px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(8, 26, 47, .92);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  backdrop-filter: blur(18px) saturate(150%);
  box-shadow: 0 18px 40px -24px rgba(0, 0, 0, 1);
  pointer-events: auto;
}
.quickbar__item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 6px;
  border-radius: 12px;
  color: var(--silver);
  font-size: .76rem;
  font-weight: 600;
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}
.quickbar__item[aria-current="page"] { color: var(--cyan); background: rgba(34, 211, 238, .12); }
.quickbar__dot {
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--cyan);
  transform: rotate(45deg);
  flex: none;
}
.quickbar__text { white-space: nowrap; }

/* ---------- 6. footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 128px);
  padding: clamp(42px, 5vw, 74px) 0 26px;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(660px 320px at 12% 0%, rgba(34, 211, 238, .13), transparent 66%),
    linear-gradient(180deg, rgba(2, 10, 20, 0), rgba(2, 10, 20, .88) 42%, #020A14 100%);
}
.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(34, 211, 238, .6) 22%, rgba(167, 139, 250, .5) 62%, transparent 100%);
}
.site-footer::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 130px;
  pointer-events: none;
  opacity: .55;
  background: repeating-linear-gradient(90deg, rgba(230, 247, 255, .055) 0 1px, transparent 1px 96px);
}

.footer-shell {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 48px);
}

.footer-grid {
  display: grid;
  gap: clamp(28px, 3.4vw, 44px) clamp(18px, 2.6vw, 36px);
  grid-template-columns: minmax(240px, 1.6fr) repeat(3, minmax(104px, .7fr)) minmax(196px, 1.15fr);
  align-items: start;
}

.footer-brand__kicker {
  display: inline-block;
  margin-bottom: 14px;
  padding: 5px 10px;
  border: 1px solid rgba(34, 211, 238, .28);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: .58rem;
  font-weight: 600;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: rgba(34, 211, 238, .92);
}
.footer-brand__name {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 2.6vw, 2.3rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: .02em;
  color: var(--mist);
  background: linear-gradient(100deg, #E6F7FF, #9BEEFF 52%, #A78BFA);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.footer-brand__desc {
  margin-top: 14px;
  max-width: 36ch;
  font-size: .9rem;
  line-height: 1.75;
  color: rgba(195, 220, 237, .8);
}
.footer-brand__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: .64rem;
  font-weight: 600;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--silver);
}
.footer-col__list { display: flex; flex-direction: column; gap: 10px; }
.footer-col__list a {
  display: inline-block;
  font-size: .94rem;
  color: #C3DCED;
  transition: color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.footer-col__list a:hover { color: var(--cyan); transform: translateX(3px); }

.footer-col__list--contact { gap: 14px; }
.footer-col__list--contact li { display: flex; flex-direction: column; gap: 2px; }
.footer-meta {
  font-family: var(--font-mono);
  font-size: .58rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: rgba(159, 179, 200, .7);
}
.footer-text { font-size: .88rem; line-height: 1.6; color: #C3DCED; }
.footer-note {
  margin-top: 16px;
  padding-left: 10px;
  border-left: 2px solid rgba(34, 211, 238, .4);
  font-size: .78rem;
  line-height: 1.7;
  color: rgba(159, 179, 200, .9);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  padding-bottom: 2px;
  border-bottom: 1px dashed rgba(34, 211, 238, .35);
  font-family: var(--font-mono);
  font-size: .86rem;
  letter-spacing: .04em;
  color: #CFE6F5;
  text-align: left;
  cursor: pointer;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.copy-btn:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.copy-btn::after {
  content: "";
  font-family: var(--font-mono);
  font-size: .58rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
  opacity: 0;
  transition: opacity var(--t-fast) var(--ease);
}
.copy-btn[data-copied="ok"]::after { content: "已复制"; opacity: 1; }
.copy-btn[data-copied="fail"]::after { content: "请手动选择"; opacity: 1; color: var(--yellow); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  margin-top: clamp(32px, 4vw, 54px);
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
  font-size: .78rem;
  color: rgba(159, 179, 200, .86);
}
.footer-bottom__legal { letter-spacing: .02em; }
.footer-bottom__icp { font-size: .72rem; letter-spacing: .08em; color: rgba(159, 179, 200, .72); }
.footer-bottom__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.footer-bottom__link { color: var(--silver); transition: color var(--t-fast) var(--ease); }
.footer-bottom__link:hover { color: var(--cyan); }

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(230, 247, 255, .04);
  font-family: var(--font-mono);
  font-size: .64rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--silver);
  cursor: pointer;
  transition: color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease);
}
.to-top::before {
  content: "";
  width: 6px;
  height: 6px;
  border-left: 1px solid currentColor;
  border-top: 1px solid currentColor;
  transform: rotate(45deg);
}
.to-top:hover { color: var(--cyan); border-color: rgba(34, 211, 238, .5); transform: translateY(-2px); }

/* ---------- 7. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 1079px) {
  :root { --header-space: 92px; }
  main { padding-bottom: 108px; }

  .brand-island { top: 12px; left: 12px; right: 12px; padding: 9px 10px 9px 13px; gap: 10px; }
  .nav-toggle { display: inline-flex; }
  .quickbar { display: grid; }

  .rail {
    left: 12px;
    right: 12px;
    top: 74px;
    width: auto;
    max-height: calc(100vh - 176px);
    overflow-y: auto;
    padding: 12px;
    border-radius: 20px;
    background: rgba(8, 26, 47, .96);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
  }
  .rail[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    border-color: rgba(34, 211, 238, .3);
  }
  .rail__title { padding: 4px 10px 8px; }
  .rail__link { padding: 12px; font-size: 1rem; }
  .rail__link[aria-current="page"] { background: rgba(34, 211, 238, .14); }
  .rail__foot { display: none; }
}

@media (max-width: 960px) {
  .island-meta { display: none; }
}

@media (max-width: 860px) {
  .island-cta { display: none; }
}

@media (max-width: 900px) {
  .grid--4, .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col--contact { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-bottom__actions { width: 100%; }
}

@media (max-width: 620px) {
  .grid--4, .grid--3, .grid--2 { grid-template-columns: minmax(0, 1fr); }
  .brand__line { display: none; }
  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 10px 12px; }
  .breadcrumbs { font-size: .62rem; }
  .footer-grid { gap: 26px 18px; }
}

@media (max-width: 380px) {
  .quickbar__text { font-size: .7rem; }
  .brand__name { font-size: .94rem; }
}

/* ---------- 8. 可访问性与桌面增强 ---------- */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (min-width: 1080px) {
  body { padding-left: var(--rail-gap); }
  .site-footer { margin-left: calc(-1 * var(--rail-gap)); }
  .brand-island { left: calc(var(--rail-gap) + 18px); right: 24px; top: 16px; }
  .footer-shell {
    max-width: none;
    margin-inline: 0;
    padding-left: calc(var(--rail-gap) + clamp(20px, 4vw, 48px));
    padding-right: clamp(20px, 4vw, 48px);
  }
  .site-header[data-scrolled] .rail { opacity: .58; }
  .site-header[data-scrolled] .rail:hover,
  .site-header[data-scrolled] .rail:focus-within { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html.js-reveal [data-reveal] { opacity: 1; transform: none; }
}