/* =========================================================
   平博赛场 — 共享样式 / assets/site.css
   深空黑基底 · 赛道红锚点 · 荧光青数据 · 电子橙操作
   ========================================================= */

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

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

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

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

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

button { font: inherit; color: inherit; }

a { color: inherit; }

table { border-collapse: collapse; width: 100%; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink-void: #0A0C10;
  --ink-carbon: #141A21;
  --ink-graphite: #2B333D;
  --red-track: #E1231C;
  --red-deep: #4A100D;
  --orange-electric: #FF7A18;
  --cyan-neon: #2CF2D0;
  --mist-white: #F1F4F7;
  --steel-blue: #97A3B0;
  --fog-light: #E8ECF0;

  --rail-w: 72px;
  --rail-w-open: 240px;
  --shell-max: 1280px;
  --trigger-h: 64px;

  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shadow-hard: 6px 6px 0 var(--ink-graphite);
  --shadow-hard-red: 6px 6px 0 var(--red-deep);

  --t-fast: 140ms;
  --t-base: 200ms;
  --ease-out: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. Base ---------- */
body {
  background: var(--ink-void);
  color: var(--mist-white);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 焦点样式：荧光青外描边 */
:focus-visible {
  outline: 2px solid var(--cyan-neon);
  outline-offset: 2px;
}

::selection {
  background: var(--cyan-neon);
  color: var(--ink-void);
}

/* ---------- 4. 排版 ---------- */
.h-display {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(28px, 6vw, 56px);
  line-height: 1.08;
  letter-spacing: -.02em;
  transform: skew(-5deg);
  transform-origin: left bottom;
}

.h-1 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.15;
  letter-spacing: -.02em;
  transform: skew(-4deg);
  transform-origin: left bottom;
}

.h-2 {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.25;
  letter-spacing: -.015em;
}

.h-3 {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -.01em;
}

.h-serif {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0;
  transform: none;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--orange-electric);
  text-transform: uppercase;
}

.kicker::before {
  content: "";
  width: 20px;
  height: 3px;
  background: var(--orange-electric);
  flex: none;
}

.rule-red {
  display: block;
  width: 48px;
  height: 3px;
  background: var(--red-track);
  border: 0;
}

/* ---------- 5. 布局 ---------- */
body { padding-inline-start: 0; }

@media (min-width: 1024px) {
  body { padding-inline-start: var(--rail-w); }
}

@media (max-width: 1023.98px) {
  body { padding-block-end: var(--trigger-h); }
}

.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: 20px;
}

@media (min-width: 768px) {
  .container { padding-inline: 28px; }
}

.section { padding-block: 56px; }

@media (min-width: 1024px) {
  .section { padding-block: 88px; }
}

.section--tight { padding-block: 32px; }

@media (min-width: 1024px) {
  .section--tight { padding-block: 48px; }
}

.band {
  background: var(--ink-carbon);
  border-block: 2px solid var(--ink-graphite);
}

.page-head {
  padding-block: 36px 22px;
  border-bottom: 2px solid var(--ink-graphite);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--ink-graphite);
}

.prose {
  max-width: 72ch;
  font-size: 16px;
  line-height: 1.75;
}

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

.prose h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 24px;
  line-height: 1.4;
  margin-top: 2em;
}

.prose h3 {
  font-weight: 800;
  font-size: 18px;
  margin-top: 1.6em;
}

/* ---------- 6. 网格 ---------- */
.grid { display: grid; gap: 24px; }

.grid--2,
.grid--3 { grid-template-columns: 1fr; }

@media (min-width: 768px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--5-7 { grid-template-columns: 5fr 7fr; }
  .grid--7-5 { grid-template-columns: 7fr 5fr; }
  .grid--3-9 { grid-template-columns: 3fr 9fr; }
  .grid--9-3 { grid-template-columns: 9fr 3fr; }
  .grid--8-4 { grid-template-columns: 8fr 4fr; }
  .grid--4-8 { grid-template-columns: 4fr 8fr; }
  .grid--6-6 { grid-template-columns: 6fr 6fr; }
}

/* ---------- 7. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 300;
  padding: 12px 20px;
  background: var(--cyan-neon);
  color: var(--ink-void);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  border: 2px solid var(--ink-void);
  box-shadow: 4px 4px 0 var(--red-track);
  transition: top var(--t-base) var(--ease-out);
}

.skip-link:focus {
  top: 16px;
}

/* ---------- 8. 头部外壳 ---------- */
.site-header {
  position: relative;
  z-index: 60;
}

/* 8.1 移动端底部触发器 */
.nav-trigger {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: var(--trigger-h);
  padding: 0 18px;
  background: var(--ink-carbon);
  color: var(--mist-white);
  border: 0;
  border-top: 2px solid var(--red-track);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
  cursor: pointer;
  box-shadow: 0 -6px 0 rgba(43, 51, 61, .45);
}

.nav-trigger__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 22px;
  flex: none;
}

.nav-trigger__bars span {
  display: block;
  height: 2px;
  background: var(--cyan-neon);
  transition: transform var(--t-fast) var(--ease-out), opacity var(--t-fast) linear;
}

.nav-trigger[aria-expanded="true"] .nav-trigger__bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-trigger[aria-expanded="true"] .nav-trigger__bars span:nth-child(2) {
  opacity: 0;
}

.nav-trigger[aria-expanded="true"] .nav-trigger__bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-trigger__text { flex: 1 1 auto; text-align: left; }

.nav-trigger__hint {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--steel-blue);
  border: 1px solid var(--ink-graphite);
  padding: 3px 8px;
}

/* 8.2 轨道导航（移动端：上滑全屏抽屉） */
.rail {
  position: fixed;
  inset: 0;
  z-index: 110;
  display: flex;
  flex-direction: column;
  background: var(--ink-carbon);
  border-top: 3px solid var(--red-track);
  padding: 0 0 84px;
  overflow-y: auto;
  overscroll-behavior: contain;
  visibility: hidden;
  transform: translateY(100%);
  transition: transform 220ms var(--ease-out), visibility 0ms linear 220ms;
}

.rail[data-open] {
  visibility: visible;
  transform: translateY(0);
  transition: transform 220ms var(--ease-out), visibility 0ms linear 0ms;
}

.rail__top {
  flex: none;
  padding: 20px 20px 16px;
  border-bottom: 2px solid var(--ink-graphite);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--mist-white);
}

.brand__badge {
  width: 38px;
  height: 38px;
  flex: none;
  display: grid;
  place-items: center;
  background: var(--red-track);
  color: var(--mist-white);
  font-size: 18px;
  font-weight: 900;
  border: 2px solid var(--ink-void);
  transform: skew(-6deg);
}

.brand__words {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand__mark {
  font-size: 18px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.01em;
  white-space: nowrap;
  transform: skew(-5deg);
  transform-origin: left bottom;
}

.brand__sig {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--steel-blue);
  white-space: nowrap;
}

.rail__list {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 12px;
}

.rail__item { flex: none; }

.rail__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 50px;
  padding: 10px 10px;
  text-decoration: none;
  color: var(--steel-blue);
  background: transparent;
  overflow: hidden;
  white-space: nowrap;
  transition: color var(--t-fast) linear, background var(--t-fast) linear, box-shadow var(--t-fast) linear;
}

.rail__num {
  flex: none;
  width: 26px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--steel-blue);
}

.rail__text {
  flex: none;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .01em;
}

.rail__link:hover,
.rail__link:focus-visible {
  color: var(--mist-white);
  background: var(--ink-void);
  box-shadow: inset 3px 0 0 var(--red-track);
}

.rail__link[aria-current="page"] {
  color: var(--mist-white);
  background: var(--ink-void);
  box-shadow: inset 3px 0 0 var(--red-track);
}

.rail__link[aria-current="page"] .rail__num {
  color: var(--cyan-neon);
}

.rail__foot {
  flex: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 16px 16px 20px;
  border-top: 2px solid var(--ink-graphite);
}

.rail__cta { width: 100%; }

.rail__cta-arrow {
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
}

.rail__status {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--steel-blue);
}

.dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-inline-end: 8px;
  vertical-align: middle;
}

.dot--cyan { background: var(--cyan-neon); }
.dot--orange { background: var(--orange-electric); }
.dot--red { background: var(--red-track); }

/* 8.3 桌面端轨道 */
@media (min-width: 1024px) {
  .nav-trigger { display: none; }

  .rail {
    inset: 0 auto 0 0;
    width: var(--rail-w);
    border-top: 0;
    border-inline-end: 2px solid var(--ink-graphite);
    padding: 0;
    overflow: hidden;
    visibility: visible;
    transform: none;
    transition: width var(--t-base) var(--ease-out);
  }

  .rail::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    width: 3px;
    background: var(--red-track);
    pointer-events: none;
  }

  .rail:hover,
  .rail:focus-within {
    width: var(--rail-w-open);
  }

  .rail[data-open] { transform: none; }

  .rail__top { padding: 22px 0 18px 18px; }

  .brand__words {
    opacity: 0;
    transition: opacity var(--t-base) var(--ease-out);
  }

  .rail:hover .brand__words,
  .rail:focus-within .brand__words { opacity: 1; }

  .rail__list { padding: 14px 12px; }

  .rail__text {
    opacity: 0;
    transform: translateX(-8px);
    transition: opacity var(--t-base) var(--ease-out), transform var(--t-base) var(--ease-out);
  }

  .rail:hover .rail__text,
  .rail:focus-within .rail__text {
    opacity: 1;
    transform: translateX(0);
  }

  .rail__foot {
    padding: 16px 14px 20px;
    align-items: stretch;
  }

  .rail__cta {
    justify-content: center;
    padding-inline: 0;
    overflow: hidden;
  }

  .rail__cta-text {
    opacity: 0;
    max-width: 0;
    overflow: hidden;
    white-space: nowrap;
    transition: opacity var(--t-base) var(--ease-out), max-width var(--t-base) var(--ease-out);
  }

  .rail:hover .rail__cta,
  .rail:focus-within .rail__cta {
    justify-content: flex-start;
    padding-inline: 16px;
  }

  .rail:hover .rail__cta-text,
  .rail:focus-within .rail__cta-text {
    opacity: 1;
    max-width: 200px;
  }

  .rail__status {
    opacity: 0;
    transition: opacity var(--t-base) var(--ease-out);
  }

  .rail:hover .rail__status,
  .rail:focus-within .rail__status { opacity: 1; }
}

/* 8.4 频道切换 */
.channel-switch {
  position: fixed;
  top: 14px;
  right: 18px;
  z-index: 70;
  display: none;
  align-items: stretch;
  background: rgba(10, 12, 16, .86);
  border: 2px solid var(--ink-graphite);
  box-shadow: 4px 4px 0 var(--ink-graphite);
}

@media (min-width: 1024px) {
  .channel-switch { display: flex; }
}

.channel-switch__label {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--steel-blue);
  border-inline-end: 2px solid var(--ink-graphite);
}

.channel-switch__opt {
  display: flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .04em;
  text-decoration: none;
  color: var(--steel-blue);
  border-inline-end: 1px solid var(--ink-graphite);
  transition: color var(--t-fast) linear, background var(--t-fast) linear;
}

.channel-switch__opt:last-child { border-inline-end: 0; }

.channel-switch__opt:hover,
.channel-switch__opt:focus-visible {
  color: var(--ink-void);
  background: var(--cyan-neon);
}

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  min-height: 46px;
  background: var(--ink-carbon);
  color: var(--mist-white);
  border: 2px solid var(--ink-graphite);
  box-shadow: var(--shadow-hard);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out),
              background var(--t-fast) linear, border-color var(--t-fast) linear, color var(--t-fast) linear;
}

.btn:hover,
.btn:focus-visible {
  transform: translate(3px, 3px);
  box-shadow: 3px 3px 0 var(--ink-graphite);
}

.btn--primary {
  background: var(--orange-electric);
  color: var(--ink-void);
  border-color: var(--red-deep);
  box-shadow: 6px 6px 0 var(--red-deep);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--red-track);
  color: var(--mist-white);
  border-color: var(--red-deep);
  box-shadow: 3px 3px 0 var(--red-deep);
}

.btn--ghost {
  background: transparent;
  color: var(--mist-white);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--cyan-neon);
  color: var(--cyan-neon);
}

.btn--sm {
  padding: 8px 14px;
  min-height: 38px;
  font-size: 13px;
}

.btn--block {
  width: 100%;
}

/* ---------- 10. 卡片 / 数据 ---------- */
.card {
  background: var(--ink-carbon);
  border: 2px solid var(--ink-graphite);
  padding: 22px;
  box-shadow: 6px 6px 0 rgba(43, 51, 61, .55);
}

.card--flat { box-shadow: none; }

.card--accent {
  border-color: var(--red-track);
  box-shadow: var(--shadow-hard-red);
}

.card__kicker {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--steel-blue);
}

.card__title {
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -.01em;
  margin-bottom: 8px;
}

.stat {
  border-inline-start: 3px solid var(--ink-graphite);
  padding-inline-start: 14px;
}

.stat--cyan { border-inline-start-color: var(--cyan-neon); }
.stat--orange { border-inline-start-color: var(--orange-electric); }
.stat--red { border-inline-start-color: var(--red-track); }

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: .02em;
  color: var(--cyan-neon);
}

.stat--orange .stat__value { color: var(--orange-electric); }
.stat--red .stat__value { color: var(--red-track); }

.stat__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--steel-blue);
  margin-inline-start: 6px;
}

.stat__label {
  margin-top: 8px;
  font-size: 13px;
  color: var(--steel-blue);
  line-height: 1.5;
}

/* ---------- 11. 标签 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 13px;
  background: var(--ink-carbon);
  border: 1px solid var(--ink-graphite);
  color: var(--steel-blue);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
  transition: border-color var(--t-fast) linear, color var(--t-fast) linear,
              background var(--t-fast) linear, box-shadow var(--t-fast) linear;
}

.chip:hover,
.chip:focus-visible {
  border-color: var(--cyan-neon);
  color: var(--mist-white);
}

.chip[aria-pressed="true"] {
  background: var(--cyan-neon);
  border-color: var(--cyan-neon);
  color: var(--ink-void);
  box-shadow: 3px 3px 0 var(--ink-graphite);
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--steel-blue);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--ink-graphite);
}

.breadcrumb a {
  text-decoration: none;
  color: var(--steel-blue);
  transition: color var(--t-fast) linear;
}

.breadcrumb a:hover { color: var(--cyan-neon); }

/* ---------- 13. 媒体容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background: var(--ink-carbon);
  border: 2px solid var(--ink-graphite);
  box-shadow: 6px 6px 0 rgba(43, 51, 61, .5);
}

.media img,
.media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.12) saturate(.86) brightness(.84);
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--3x4 { aspect-ratio: 3 / 4; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

.media__noise {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(241, 244, 247, .04) 0 1px,
    transparent 1px 3px
  );
}

.media__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 13px;
  background: var(--red-track);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 80px;
  background: var(--ink-void);
}

@media (min-width: 1024px) {
  .site-footer { margin-top: 120px; }
}

.footer__band {
  position: relative;
  background: var(--ink-carbon);
  border-top: 2px solid var(--ink-graphite);
  padding: 56px 0 44px;
}

.footer__speedline {
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 10px;
  display: block;
  background:
    repeating-linear-gradient(96deg,
      var(--red-track) 0 22px,
      var(--ink-graphite) 22px 26px,
      transparent 26px 48px);
  transform: skewY(-1.2deg);
  transform-origin: left top;
}

.footer__inner {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: 20px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 768px) {
  .footer__inner {
    padding-inline: 28px;
    grid-template-columns: 5fr 7fr;
  }
  .footer__contact { grid-column: 1 / -1; }
}

@media (min-width: 1024px) {
  .footer__inner {
    grid-template-columns: 3fr 5fr 4fr;
    gap: 48px;
  }
  .footer__contact { grid-column: auto; }
}

.footer__mark {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.2;
  transform: skew(-5deg);
  transform-origin: left bottom;
  display: inline-block;
}

.footer__sig {
  margin-top: 8px;
  font-size: 13px;
  color: var(--steel-blue);
  letter-spacing: .04em;
}

.footer__legal {
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--steel-blue);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 24px;
}

@media (min-width: 768px) {
  .footer__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.footer__coltitle {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--mist-white);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--ink-graphite);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer__links a {
  font-size: 14px;
  text-decoration: none;
  color: var(--steel-blue);
  transition: color var(--t-fast) linear, padding-inline-start var(--t-fast) var(--ease-out);
}

.footer__links a:hover,
.footer__links a:focus-visible {
  color: var(--cyan-neon);
  padding-inline-start: 6px;
}

.footer__contactlist {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.footer__contactlist li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  align-items: baseline;
}

.footer__k {
  flex: none;
  width: 62px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--red-track);
}

.footer__v {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--mist-white);
  word-break: break-all;
}

.footer__note {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel-blue);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  background: transparent;
  border: 2px solid var(--ink-graphite);
  color: var(--mist-white);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .02em;
  cursor: pointer;
  transition: border-color var(--t-fast) linear, background var(--t-fast) linear,
              color var(--t-fast) linear, box-shadow var(--t-fast) var(--ease-out);
}

.copy-btn:hover,
.copy-btn:focus-visible {
  border-color: var(--cyan-neon);
  box-shadow: 4px 4px 0 var(--ink-graphite);
}

.copy-btn.is-done {
  background: var(--cyan-neon);
  border-color: var(--cyan-neon);
  color: var(--ink-void);
}

.copy-btn__icon {
  font-size: 14px;
  line-height: 1;
}

.footer__baseline {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 22px 20px 40px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--steel-blue);
}

@media (min-width: 768px) {
  .footer__baseline { padding-inline: 28px; }
}

/* ---------- 15. JS 注入组件 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 200;
  background: var(--cyan-neon);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

@media (min-width: 1024px) {
  .scroll-progress { left: var(--rail-w); }
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--t-base) var(--ease-out), transform var(--t-base) var(--ease-out);
}

.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 16. 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .scroll-progress { transition: none; }
}