/* ==========================================================================
   火狐体育官网 · /assets/site.css
   共享外壳：命令栏头部、多层页脚、通用积木与响应式
   ========================================================================== */

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

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

body {
  margin: 0;
  background: var(--c-black);
  color: var(--c-white);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .004em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.03em;
  line-height: 1.06;
  color: var(--c-white);
}

p { margin: 0; }

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

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

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

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

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

::selection { background: var(--c-orange); color: #0B0E13; }

/* ---------- 2. Design tokens ---------- */
:root {
  --c-orange: #FF4D1C;
  --c-orange-soft: #FF7A45;
  --c-black: #0B0E13;
  --c-black-2: #11151C;
  --c-black-3: #171C25;
  --c-cyan: #00D8FF;
  --c-ruby: #7A1F3D;
  --c-indigo: #3B2F80;
  --c-teal: #0E3B3A;
  --c-white: #F7F4EF;
  --c-gray: #8B949E;
  --c-amber: #FFB020;

  --line: rgba(247, 244, 239, .14);
  --line-soft: rgba(247, 244, 239, .08);
  --line-strong: rgba(247, 244, 239, .28);
  --glass: rgba(247, 244, 239, .06);

  --font-display: "Archivo Black", "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --wrap: 1320px;
  --gutter: clamp(18px, 4vw, 52px);
  --radius: 14px;
  --ease: cubic-bezier(.22, .7, .3, 1);
  --shadow: 0 24px 60px -30px rgba(0, 0, 0, .9);
}

/* ---------- 3. 基础排版工具 ---------- */
.wrap {
  width: calc(100% - var(--gutter) * 2);
  max-width: var(--wrap);
  margin-inline: auto;
}

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

.lead {
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.72;
  color: rgba(247, 244, 239, .8);
  max-width: 62ch;
}

.divider {
  height: 1px; border: 0; margin-block: clamp(24px, 4vw, 48px);
  background: linear-gradient(90deg, rgba(255, 77, 28, .65), rgba(0, 216, 255, .35) 46%, transparent);
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--c-cyan);
}
.eyebrow::before {
  content: ""; width: 26px; height: 2px; background: var(--c-orange);
}

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent; border-radius: 999px;
  font-family: var(--font-body); font-size: 14px; font-weight: 700;
  letter-spacing: .04em; line-height: 1.2; white-space: nowrap;
  cursor: pointer; text-decoration: none;
  transition: transform .18s var(--ease), background-color .18s ease, color .18s ease, border-color .18s ease;
}
.btn--primary {
  background: var(--c-orange); color: #0B0E13;
  box-shadow: 0 12px 28px -16px rgba(255, 77, 28, .95);
}
.btn--primary:hover { background: var(--c-orange-soft); color: #0B0E13; transform: translateY(-1px); }
.btn--ghost {
  background: rgba(247, 244, 239, .04);
  border-color: var(--line-strong); color: var(--c-white);
}
.btn--ghost:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.btn--cyan { background: var(--c-cyan); color: #04141B; }
.btn--cyan:hover { background: #57E6FF; color: #04141B; transform: translateY(-1px); }

/* ---------- 5. 面包屑 ---------- */
.crumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em;
  color: var(--c-gray);
}
.crumb__item { color: var(--c-gray); }
.crumb__item:hover { color: var(--c-cyan); }
.crumb__item[aria-current="page"] { color: var(--c-white); }
.crumb__sep { color: rgba(139, 148, 158, .6); }

/* ---------- 6. 正文容器 ---------- */
.prose {
  max-width: 74ch;
  font-size: 17px; line-height: 1.85;
  color: rgba(247, 244, 239, .86);
}
.prose p { margin-block: 0 1.15em; }
.prose h2 { font-size: clamp(26px, 3.4vw, 40px); margin-block: 2em .55em; }
.prose h3 { font-size: clamp(20px, 2.4vw, 26px); margin-block: 1.6em .45em; }
.prose ul { margin-block: 0 1.3em; }
.prose li { position: relative; padding-left: 1.15em; margin-block: .42em; }
.prose li::before {
  content: ""; position: absolute; left: 0; top: .78em;
  width: 6px; height: 6px; background: var(--c-orange); transform: rotate(45deg);
}
.prose strong { color: var(--c-white); }
.prose a { border-bottom: 1px solid rgba(0, 216, 255, .45); }
.prose code {
  font-family: var(--font-mono); font-size: .9em;
  background: rgba(0, 216, 255, .12); color: var(--c-cyan);
  padding: .1em .42em; border-radius: 4px;
}

/* ---------- 7. 章节与面板 ---------- */
.section { padding-block: clamp(46px, 7.5vw, 104px); }

.section__head {
  display: flex; flex-direction: column; gap: 14px;
  margin-bottom: clamp(24px, 4vw, 48px);
  max-width: 64ch;
}

.chapter { display: flex; align-items: flex-start; gap: clamp(12px, 2vw, 28px); }
.chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-mono); font-weight: 700;
  font-size: clamp(56px, 11vw, 140px); line-height: .82; letter-spacing: -.05em;
  color: transparent; -webkit-text-stroke: 1.5px rgba(247, 244, 239, .3);
}
.chapter__title { font-size: clamp(24px, 4vw, 46px); }

.panel {
  position: relative;
  padding: clamp(22px, 3.4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--c-black-2);
  overflow: hidden;
}

.panel--glass {
  background: linear-gradient(140deg, rgba(247, 244, 239, .11), rgba(247, 244, 239, .03) 55%, rgba(0, 216, 255, .07));
  border-color: rgba(247, 244, 239, .2);
  -webkit-backdrop-filter: blur(14px) saturate(130%);
  backdrop-filter: blur(14px) saturate(130%);
}

.panel--solid { background: var(--c-white); color: #23282F; border-color: transparent; }
.panel--solid h2, .panel--solid h3, .panel--solid .panel__title { color: #0B0E13; }
.panel--solid .panel__text { color: #474E58; }

.panel--ruby { background: linear-gradient(160deg, #7A1F3D, #340D1C 92%); border-color: rgba(247, 244, 239, .16); }
.panel--indigo { background: linear-gradient(160deg, #3B2F80, #191338 92%); border-color: rgba(247, 244, 239, .16); }
.panel--teal { background: linear-gradient(160deg, #0E3B3A, #051C1B 92%); border-color: rgba(247, 244, 239, .16); }
.panel--amber { background: linear-gradient(160deg, #FFB020, #FF7A00 96%); color: #1A1206; border-color: transparent; }
.panel--amber h2, .panel--amber h3, .panel--amber .panel__title { color: #1A1206; }
.panel--amber .panel__text { color: rgba(26, 18, 6, .78); }

.panel--outline { background: transparent; border-color: var(--line-strong); }
.panel--slant { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), 0 100%); }

.panel__title { font-size: clamp(20px, 2.6vw, 30px); margin-bottom: 10px; }
.panel__text { font-size: 15.5px; line-height: 1.75; color: rgba(247, 244, 239, .75); }

/* ---------- 8. 网格与堆叠 ---------- */
.grid { display: grid; gap: clamp(16px, 2.4vw, 30px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 272px), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 208px), 1fr)); }

.stack { display: flex; flex-direction: column; gap: clamp(14px, 2vw, 26px); }
.stack--tight { gap: 10px; }

/* ---------- 9. 标签与数据 ---------- */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 11px; border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(247, 244, 239, .05);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em;
  color: rgba(247, 244, 239, .8);
}
.tag--cyan { border-color: rgba(0, 216, 255, .5); background: rgba(0, 216, 255, .1); color: var(--c-cyan); }
.tag--amber { border-color: rgba(255, 176, 32, .5); background: rgba(255, 176, 32, .1); color: var(--c-amber); }
.tag--orange { border-color: rgba(255, 77, 28, .55); background: rgba(255, 77, 28, .12); color: var(--c-orange-soft); }

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__value {
  font-family: var(--font-display);
  font-size: clamp(32px, 6vw, 68px); line-height: .95; letter-spacing: -.04em;
  color: var(--c-orange);
}
.stat__label {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--c-gray);
}

/* ---------- 10. 图片容器基础规则 ---------- */
.frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(120deg, rgba(255, 77, 28, .22), rgba(0, 216, 255, .16)),
    repeating-linear-gradient(135deg, rgba(247, 244, 239, .055) 0 14px, rgba(247, 244, 239, 0) 14px 28px),
    #131820;
}
.frame__img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.frame__cap {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: 12px 16px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em;
  color: var(--c-white);
  background: linear-gradient(180deg, transparent, rgba(11, 14, 19, .9));
}
.frame--wide { aspect-ratio: 16 / 9; }
.frame--tall { aspect-ratio: 3 / 4; }
.frame--square { aspect-ratio: 1 / 1; }
.frame--slant { clip-path: polygon(0 5%, 100% 0, 100% 100%, 0 95%); }

/* ---------- 11. 头部 · 命令栏 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11, 14, 19, .9);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid var(--line);
  color: var(--c-white);
}

.skip-link {
  position: fixed; top: 0; left: 50%; z-index: 200;
  transform: translate(-50%, -130%);
  padding: 10px 22px;
  background: var(--c-orange); color: #0B0E13;
  border-radius: 0 0 10px 10px;
  font-family: var(--font-mono); font-size: 13px; letter-spacing: .08em;
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); color: #0B0E13; }

.cmd-bar {
  display: flex; align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  width: calc(100% - var(--gutter) * 2);
  max-width: var(--wrap);
  margin-inline: auto;
  min-height: 66px;
  padding-block: 6px;
}

.brand {
  display: flex; align-items: center; gap: 11px;
  flex: 0 0 auto;
  padding: 6px 6px 6px 0;
  color: var(--c-white);
}
.brand:hover { color: var(--c-white); }

.brand__mark {
  position: relative;
  display: grid; place-items: center;
  width: 30px; height: 30px; flex: 0 0 auto;
  background: linear-gradient(135deg, var(--c-orange), var(--c-amber));
  clip-path: polygon(50% 0%, 100% 28%, 100% 72%, 50% 100%, 0% 72%, 0% 28%);
  transition: background .2s ease;
}
.brand__mark::after {
  content: "";
  width: 11px; height: 11px;
  background: var(--c-black);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}
.brand:hover .brand__mark { background: linear-gradient(135deg, var(--c-amber), var(--c-orange)); }

.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__name {
  font-family: var(--font-display); font-size: 16px;
  letter-spacing: -.01em; line-height: 1.15;
}
.brand__descriptor {
  margin-top: 3px;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em;
  color: var(--c-gray); white-space: nowrap;
}

.cmd-nav { flex: 1 1 auto; display: flex; justify-content: center; min-width: 0; }
.cmd-nav__list { display: flex; align-items: center; gap: 2px; flex-wrap: nowrap; }
.cmd-nav__item { display: flex; min-width: 0; }

.cmd-nav__link {
  position: relative;
  display: inline-flex; align-items: baseline; gap: 7px;
  padding: 9px 10px;
  border: 1px solid transparent; border-radius: 8px;
  color: rgba(247, 244, 239, .7);
  font-size: 13.5px; line-height: 1.2;
  white-space: nowrap;
  transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}
.cmd-nav__link:hover { color: var(--c-white); background: rgba(247, 244, 239, .07); }

.cmd-nav__idx {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .08em;
  color: rgba(139, 148, 158, .9);
  transition: color .18s ease;
}
.cmd-nav__link:hover .cmd-nav__idx { color: var(--c-cyan); }

.cmd-nav__label { font-weight: 600; }

.cmd-nav__link[aria-current="page"] {
  color: var(--c-white);
  background: linear-gradient(180deg, rgba(255, 77, 28, .26), rgba(255, 77, 28, .07));
  border-color: rgba(255, 77, 28, .55);
}
.cmd-nav__link[aria-current="page"] .cmd-nav__idx { color: var(--c-orange); }
.cmd-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute; left: 10px; right: 10px; bottom: 3px; height: 2px;
  background: var(--c-orange);
}

.cmd-bar__side {
  display: flex; align-items: center; gap: 14px;
  flex: 0 0 auto; margin-left: auto;
}

.cmd-bar__utility {
  margin: 0; padding: 5px 11px;
  border: 1px dashed rgba(139, 148, 158, .45); border-radius: 999px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  color: var(--c-gray); white-space: nowrap;
}

.cmd-bar__cta { font-size: 13px; padding: 9px 16px; }

.nav-toggle {
  display: none; align-items: center; gap: 9px;
  padding: 9px 14px;
  border: 1px solid var(--line-strong); border-radius: 999px;
  background: rgba(247, 244, 239, .05);
  color: var(--c-white); cursor: pointer;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .1em;
  transition: border-color .18s ease, color .18s ease;
}
.nav-toggle:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.nav-toggle__bars { display: grid; gap: 4px; width: 16px; }
.nav-toggle__bars span {
  display: block; height: 2px; width: 16px;
  background: currentColor; border-radius: 2px;
  transition: transform .2s var(--ease), opacity .2s ease, width .2s ease;
}
.nav-toggle__bars span:nth-child(2) { width: 12px; }
.nav-toggle__text { font-family: var(--font-mono); }

.site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); width: 16px; }
.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(-6px) rotate(-45deg); width: 16px; }

.scroll-meter {
  position: relative; height: 2px; overflow: hidden;
  background: rgba(247, 244, 239, .09);
}
.scroll-meter__fill {
  display: block; height: 100%; width: 100%;
  transform: scaleX(0); transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-orange), var(--c-amber) 40%, var(--c-cyan));
}

/* ---------- 12. 页脚 · 多层数据面板 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 140px);
  border-top: 1px solid rgba(255, 77, 28, .35);
  color: rgba(247, 244, 239, .74);
  font-size: 15px;
  background:
    radial-gradient(120% 90% at 6% 0%, rgba(255, 77, 28, .18), transparent 58%),
    radial-gradient(90% 80% at 94% 6%, rgba(0, 216, 255, .12), transparent 60%),
    var(--c-black);
}
.site-footer::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--c-orange) 0%, var(--c-ruby) 32%, var(--c-indigo) 64%, var(--c-teal) 100%);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(220px, 1.5fr) repeat(3, minmax(118px, 1fr)) minmax(198px, 1.3fr);
  gap: clamp(22px, 3vw, 52px);
  width: calc(100% - var(--gutter) * 2);
  max-width: var(--wrap);
  margin-inline: auto;
  padding-block: clamp(40px, 6vw, 76px);
  border-bottom: 1px solid var(--line-soft);
}

.footer-lead { display: flex; flex-direction: column; gap: 12px; }
.footer-brand {
  font-family: var(--font-display); font-size: 22px;
  letter-spacing: -.02em; color: var(--c-white);
}
.footer-line { max-width: 34ch; line-height: 1.7; color: rgba(247, 244, 239, .7); }
.footer-meta {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em;
  color: var(--c-cyan);
}

.footer-col { display: flex; flex-direction: column; min-width: 0; }
.footer-col__title {
  margin-bottom: 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 700;
  letter-spacing: .18em; text-transform: uppercase;
  color: rgba(247, 244, 239, .5);
}
.footer-col__list { display: flex; flex-direction: column; gap: 10px; }
.footer-col__link {
  display: inline-flex; align-items: center; gap: 9px;
  color: rgba(247, 244, 239, .78); font-size: 15px;
  transition: color .16s ease, transform .16s var(--ease);
}
.footer-col__link::before {
  content: ""; width: 10px; height: 1px;
  background: rgba(139, 148, 158, .55);
  transition: width .16s var(--ease), background-color .16s ease;
}
.footer-col__link:hover { color: var(--c-white); transform: translateX(2px); }
.footer-col__link:hover::before { width: 16px; background: var(--c-orange); }
.footer-col__cta { margin-top: 16px; align-self: flex-start; font-size: 13px; padding: 9px 16px; }

.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.footer-contact__item { display: flex; flex-direction: column; gap: 2px; }
.footer-contact__key {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em;
  color: var(--c-gray);
}
.footer-contact__value {
  font-size: 14.5px; line-height: 1.6;
  color: rgba(247, 244, 239, .88);
  word-break: break-word;
}
.footer-note {
  margin-top: 14px;
  font-size: 13px; line-height: 1.7;
  color: rgba(139, 148, 158, .95);
}

.copy-btn {
  align-self: flex-start; margin-top: 5px;
  padding: 5px 12px;
  border: 1px solid rgba(0, 216, 255, .45); border-radius: 999px;
  background: rgba(0, 216, 255, .1); color: var(--c-cyan);
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  cursor: pointer;
  transition: background-color .16s ease, color .16s ease, border-color .16s ease;
}
.copy-btn:hover { background: var(--c-cyan); color: #04141B; }
.copy-btn[data-state="done"] { background: var(--c-amber); border-color: var(--c-amber); color: #1A1206; }
.copy-btn[data-state="fail"] { background: transparent; border-color: var(--c-orange); color: var(--c-orange); }

.footer-base {
  display: flex; flex-wrap: wrap; justify-content: space-between;
  gap: 12px 28px;
  width: calc(100% - var(--gutter) * 2);
  max-width: var(--wrap);
  margin-inline: auto;
  padding-block: 22px 32px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em;
  color: var(--c-gray);
}
.footer-base__icp,
.footer-base__copy { margin: 0; }

/* ---------- 13. 显现动效 ---------- */
html.has-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s ease, transform .55s var(--ease);
}
html.has-reveal [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1320px) {
  .cmd-bar__utility { display: none; }
}

@media (max-width: 1180px) {
  .nav-toggle { display: inline-flex; }
  .cmd-bar { min-height: 60px; }
  .site-header { position: sticky; }
  .cmd-nav {
    position: absolute; left: 0; right: 0; top: 100%;
    display: block;
    padding: 12px var(--gutter) 22px;
    background: rgba(11, 14, 19, .98);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    max-height: calc(100vh - 62px);
    overflow-y: auto;
    opacity: 0; visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s ease, transform .22s var(--ease), visibility 0s linear .24s;
  }
  .site-header[data-open] .cmd-nav {
    opacity: 1; visibility: visible; transform: none;
    transition-delay: 0s, 0s, 0s;
  }
  .cmd-nav__list { flex-direction: column; align-items: stretch; gap: 6px; }
  .cmd-nav__link {
    justify-content: space-between;
    padding: 14px 16px; font-size: 16px;
    border-color: var(--line-soft);
    background: rgba(247, 244, 239, .03);
  }
  .cmd-nav__link[aria-current="page"]::after { left: 16px; right: 16px; bottom: 6px; }
}

@media (max-width: 1080px) {
  .footer-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-lead { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .brand__descriptor { display: none; }
}

@media (max-width: 640px) {
  :root { --radius: 12px; }
  .cmd-bar__cta { display: none; }
  .brand__name { font-size: 15px; }
  .footer-inner { grid-template-columns: 1fr; gap: 30px; }
  .footer-base { flex-direction: column; align-items: flex-start; }
}

/* ---------- 15. 焦点与减弱动效 ---------- */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0s !important;
    scroll-behavior: auto !important;
  }
  html.has-reveal [data-reveal] { opacity: 1; transform: none; }
  .scroll-meter__fill { transition: none; }
}