/* ============================================================
   B体育主站 — 共享样式表 /assets/site.css
   ============================================================ */

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

html, body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, dl, dt, dd,
figure, figcaption, blockquote, table, th, td, fieldset {
  margin: 0;
  padding: 0;
}
ul, ol { list-style: none; }
img, svg, video { max-width: 100%; display: block; }
table { border-collapse: collapse; border-spacing: 0; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; }
hr { border: 0; }

/* ---------- 2. Tokens ---------- */
:root {
  /* 色彩：近单色暗夜蓝体系 */
  --bs-deep: #050A14;
  --bs-panel: #0A1626;
  --bs-panel-2: #10233A;
  --bs-line: #1B3A5C;
  --bs-line-soft: rgba(27, 58, 92, 0.5);

  --bs-green: #39FF88;
  --bs-green-soft: #7CFFB2;
  --bs-green-ink: #04140B;
  --bs-amber: #FFA928;
  --bs-amber-dark: #2A1A00;

  --bs-ink: #E8F1F8;
  --bs-muted: #8FA6BC;

  /* 排版 */
  --bs-font-display: "Arial Narrow", "Helvetica Neue", Arial, system-ui,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --bs-font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --bs-font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* 布局 */
  --bs-header-h: 78px;
  --bs-shell: 1240px;
  --bs-shell-narrow: 760px;
  --bs-gutter: clamp(18px, 4vw, 56px);

  --bs-radius: 16px;
  --bs-radius-sm: 8px;

  --bs-ease: cubic-bezier(0.22, 0.7, 0.28, 1);
}

/* ---------- 3. 基础与中文排版 ---------- */
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background-color: var(--bs-deep);
}

body {
  padding-top: var(--bs-header-h);
  min-height: 100vh;
  background-color: var(--bs-deep);
  background-image:
    radial-gradient(1100px 620px at 78% -12%, rgba(57, 255, 136, 0.07), transparent 62%),
    radial-gradient(900px 520px at -10% 18%, rgba(16, 35, 58, 0.85), transparent 66%),
    linear-gradient(180deg, #061020 0%, var(--bs-deep) 58%);
  background-repeat: no-repeat;
  color: var(--bs-ink);
  font-family: var(--bs-font-body);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--bs-font-display);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--bs-ink);
}

h1 { font-size: clamp(2rem, 6vw, 5rem); }
h2 { font-size: clamp(1.6rem, 3.6vw, 2.9rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.55rem); }
h4 { font-size: 1.05rem; letter-spacing: 0.06em; }

p { line-height: 1.75; }

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

code, kbd, samp, .bs-mono { font-family: var(--bs-font-mono); }

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

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

/* ---------- 4. 工具类 ---------- */
.bs-sr-only {
  position: absolute !important;
  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;
}

.bs-shell {
  width: 100%;
  max-width: var(--bs-shell);
  margin-inline: auto;
  padding-inline: var(--bs-gutter);
}

.bs-shell--narrow { max-width: var(--bs-shell-narrow); }

.bs-main { display: block; }

.bs-hero--bleed {
  margin-top: calc(var(--bs-header-h) * -1);
  padding-top: var(--bs-header-h);
}

.bs-skip {
  position: fixed;
  top: 8px;
  left: 50%;
  z-index: 200;
  transform: translate(-50%, -160%);
  padding: 12px 22px;
  background: var(--bs-green);
  color: var(--bs-green-ink);
  font-family: var(--bs-font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-decoration: none;
  border-radius: 4px;
  transition: transform 0.24s var(--bs-ease);
}
.bs-skip:focus { transform: translate(-50%, 0); }

.bs-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 9px;
  border-radius: 50%;
  background: var(--bs-green);
  box-shadow: 0 0 0 4px rgba(57, 255, 136, 0.14);
  vertical-align: middle;
  animation: bs-pulse 2.6s ease-in-out infinite;
}

@keyframes bs-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.82); }
}

/* ---------- 5. 按钮 ---------- */
.bs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 12px 20px;
  border: 1px solid var(--bs-line);
  border-radius: 3px;
  background: transparent;
  color: var(--bs-ink);
  font-family: var(--bs-font-display);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.22s var(--bs-ease),
              border-color 0.22s var(--bs-ease),
              color 0.22s var(--bs-ease),
              transform 0.22s var(--bs-ease);
}
.bs-btn:hover { transform: translateY(-1px); }

.bs-btn--solid {
  background: var(--bs-green);
  border-color: var(--bs-green);
  color: var(--bs-green-ink);
}
.bs-btn--solid:hover {
  background: var(--bs-green-soft);
  border-color: var(--bs-green-soft);
}

.bs-btn--ghost:hover {
  border-color: var(--bs-green);
  color: var(--bs-green);
}

.bs-btn--amber {
  background: var(--bs-amber);
  border-color: var(--bs-amber);
  color: var(--bs-amber-dark);
}
.bs-btn--amber:hover {
  background: #ffbf57;
  border-color: #ffbf57;
}

/* ---------- 6. 页头 ---------- */
.bs-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  height: var(--bs-header-h);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.32s var(--bs-ease),
              border-color 0.32s var(--bs-ease),
              box-shadow 0.32s var(--bs-ease);
}

.bs-header[data-scrolled] {
  background: rgba(5, 10, 20, 0.93);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--bs-line);
  box-shadow: 0 24px 48px -34px rgba(0, 0, 0, 0.95);
}

.bs-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  height: 100%;
  width: 100%;
  max-width: var(--bs-shell);
  margin-inline: auto;
  padding-inline: var(--bs-gutter);
}

/* 品牌 */
.bs-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--bs-ink);
}

.bs-brand__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  background: linear-gradient(140deg, var(--bs-green) 0%, #17935A 100%);
  border-radius: 15px 4px 15px 4px;
  box-shadow: 0 0 0 1px rgba(57, 255, 136, 0.35),
              0 10px 26px -16px rgba(57, 255, 136, 0.9);
}

.bs-brand__glyph {
  font-family: var(--bs-font-display);
  font-size: 21px;
  font-weight: 800;
  line-height: 1;
  color: var(--bs-green-ink);
  letter-spacing: 0;
}

.bs-brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.1;
}

.bs-brand__name {
  font-family: var(--bs-font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  white-space: nowrap;
}

.bs-brand__meta {
  font-family: var(--bs-font-mono);
  font-size: 9px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--bs-muted);
  white-space: nowrap;
}

.bs-brand--footer .bs-brand__mark { width: 38px; height: 38px; }
.bs-brand--footer .bs-brand__glyph { font-size: 19px; }
.bs-brand--footer .bs-brand__name { font-size: 16px; }

/* 在线状态 */
.bs-header__ticker {
  display: none;
  margin-left: auto;
  align-items: center;
  font-family: var(--bs-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bs-muted);
  white-space: nowrap;
}

.bs-header__ticker-dot {
  width: 6px;
  height: 6px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--bs-green);
  box-shadow: 0 0 0 3px rgba(57, 255, 136, 0.16);
  animation: bs-pulse 2.6s ease-in-out infinite;
}

/* 导航 */
.bs-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.bs-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.bs-nav__link {
  position: relative;
  display: block;
  padding: 10px 13px;
  border-radius: 3px;
  color: var(--bs-muted);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--bs-ease), background-color 0.2s var(--bs-ease);
}

.bs-nav__link:hover {
  color: var(--bs-ink);
  background: rgba(16, 35, 58, 0.7);
}

.bs-nav__link[aria-current="page"] { color: var(--bs-green); }

.bs-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 3px;
  height: 2px;
  background: var(--bs-green);
  border-radius: 2px;
}

.bs-nav__actions { display: none; }

/* 移动导航按钮 */
.bs-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 14px;
  border: 1px solid var(--bs-line);
  border-radius: 4px;
  background: rgba(10, 22, 38, 0.75);
  color: var(--bs-ink);
  cursor: pointer;
  transition: border-color 0.2s var(--bs-ease), color 0.2s var(--bs-ease);
}

.bs-nav-toggle:hover { border-color: var(--bs-green); color: var(--bs-green); }

.bs-nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.bs-nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.24s var(--bs-ease), opacity 0.24s var(--bs-ease);
}

.bs-nav-toggle[aria-expanded="true"] .bs-nav-toggle__bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.bs-nav-toggle[aria-expanded="true"] .bs-nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}
.bs-nav-toggle[aria-expanded="true"] .bs-nav-toggle__bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.bs-nav-toggle__label {
  font-family: var(--bs-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
}

/* 滚动进度 */
.bs-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(27, 58, 92, 0.35);
  opacity: 0;
  transition: opacity 0.3s var(--bs-ease);
}

.bs-header[data-scrolled] .bs-progress { opacity: 1; }

.bs-progress__fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--bs-green), var(--bs-amber));
}

/* 右侧刻度轨 */
.bs-rail {
  position: fixed;
  top: 50%;
  right: 14px;
  z-index: 70;
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  transform: translateY(-50%);
  pointer-events: none;
}

.bs-rail__line {
  width: 1px;
  height: 70px;
  background: linear-gradient(180deg, transparent, var(--bs-line), transparent);
}

.bs-rail__tick {
  width: 9px;
  height: 1px;
  background: var(--bs-line);
}

.bs-rail__label {
  font-family: var(--bs-font-mono);
  font-size: 9px;
  letter-spacing: 0.32em;
  color: var(--bs-muted);
  writing-mode: vertical-rl;
  text-transform: uppercase;
}

/* ---------- 7. 页脚 ---------- */
.bs-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 128px);
  border-top: 1px solid var(--bs-line);
  background: linear-gradient(180deg, rgba(10, 22, 38, 0.92) 0%, rgba(5, 10, 20, 1) 72%);
}

.bs-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(360px, 46%);
  height: 1px;
  background: linear-gradient(90deg, var(--bs-green), transparent);
}

.bs-footer__inner {
  width: 100%;
  max-width: var(--bs-shell);
  margin-inline: auto;
  padding: clamp(42px, 5.4vw, 76px) var(--bs-gutter) 0;
}

.bs-footer__grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.25fr;
  gap: clamp(24px, 3.2vw, 52px);
  padding-bottom: clamp(34px, 4.4vw, 58px);
  border-bottom: 1px solid var(--bs-line-soft);
}

.bs-footer__brand { display: flex; flex-direction: column; gap: 16px; }

.bs-footer__tagline {
  font-family: var(--bs-font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bs-green);
}

.bs-footer__note {
  max-width: 42ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--bs-muted);
}

.bs-footer__title {
  margin-bottom: 16px;
  font-family: var(--bs-font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bs-amber);
}

.bs-footer__links { display: grid; gap: 10px; }

.bs-footer__links a {
  display: inline-flex;
  align-items: center;
  font-size: 14.5px;
  color: var(--bs-muted);
  text-decoration: none;
  transition: color 0.2s var(--bs-ease);
}

.bs-footer__links a::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  margin-right: 11px;
  border: 1px solid var(--bs-line);
  border-radius: 50%;
  transition: background-color 0.2s var(--bs-ease), border-color 0.2s var(--bs-ease);
}

.bs-footer__links a:hover { color: var(--bs-ink); }
.bs-footer__links a:hover::before {
  background: var(--bs-green);
  border-color: var(--bs-green);
}

.bs-contact { display: grid; gap: 14px; }

.bs-contact__row { display: grid; gap: 4px; }

.bs-contact__label {
  font-family: var(--bs-font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bs-muted);
}

.bs-contact__value {
  font-family: var(--bs-font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--bs-ink);
  word-break: break-word;
}

.bs-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding-block: 24px;
  font-family: var(--bs-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--bs-muted);
}

.bs-footer__status { display: inline-flex; align-items: center; }

/* ---------- 8. 通用内容组件 ---------- */
.bs-section { padding-block: clamp(48px, 7vw, 108px); }

.bs-section__head {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  align-items: end;
  gap: clamp(18px, 3vw, 44px);
  margin-bottom: clamp(28px, 4vw, 52px);
}

.bs-section__title { margin-top: 14px; }

.bs-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--bs-font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--bs-amber);
}

.bs-eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--bs-amber);
}

.bs-lede {
  max-width: 62ch;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.85;
  color: var(--bs-ink);
}

.bs-panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  border: 1px solid var(--bs-line);
  border-radius: var(--bs-radius);
  background: linear-gradient(158deg, rgba(16, 35, 58, 0.88) 0%, rgba(10, 22, 38, 0.9) 100%);
  transition: border-color 0.24s var(--bs-ease), transform 0.24s var(--bs-ease);
}

.bs-panel:hover {
  border-color: rgba(57, 255, 136, 0.45);
  transform: translateY(-3px);
}

.bs-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid rgba(57, 255, 136, 0.3);
  border-radius: 999px;
  background: rgba(57, 255, 136, 0.1);
  color: var(--bs-green);
  font-family: var(--bs-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.bs-tag--amber {
  border-color: rgba(255, 169, 40, 0.36);
  background: var(--bs-amber-dark);
  color: var(--bs-amber);
}

.bs-stat { display: grid; gap: 6px; }

.bs-stat__value {
  font-family: var(--bs-font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bs-green);
  font-variant-numeric: tabular-nums;
}

.bs-stat__label {
  font-family: var(--bs-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bs-muted);
}

.bs-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  font-family: var(--bs-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bs-muted);
}

.bs-crumbs a { color: var(--bs-muted); text-decoration: none; }
.bs-crumbs a:hover { color: var(--bs-green); }
.bs-crumbs__sep { color: var(--bs-line); }
.bs-crumbs [aria-current="page"] { color: var(--bs-ink); }

/* ---------- 9. 图片容器基础规则 ---------- */
.bs-media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--bs-line);
  border-radius: var(--bs-radius);
  background-color: var(--bs-panel-2);
  background-image:
    linear-gradient(140deg, rgba(16, 35, 58, 0.95), rgba(5, 10, 20, 0.95)),
    repeating-linear-gradient(90deg, rgba(27, 58, 92, 0.45) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(0deg, rgba(27, 58, 92, 0.45) 0 1px, transparent 1px 44px);
}

.bs-media > img,
.bs-media > svg,
.bs-media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.bs-media--wide { aspect-ratio: 21 / 9; }
.bs-media--tall { aspect-ratio: 4 / 5; }
.bs-media--square { aspect-ratio: 1 / 1; }

.bs-media__cap {
  position: absolute;
  left: 14px;
  bottom: 12px;
  right: 14px;
  font-family: var(--bs-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bs-muted);
  text-shadow: 0 1px 8px rgba(5, 10, 20, 0.9);
}

/* ---------- 10. 渐入协议 ---------- */
html.bs-js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
}

html.bs-js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  transition: opacity 0.62s var(--bs-ease), transform 0.62s var(--bs-ease);
}

/* ---------- 11. 响应式 ---------- */
@media (min-width: 1200px) {
  .bs-header__ticker { display: inline-flex; }
}

@media (min-width: 1440px) {
  .bs-rail { display: flex; }
}

@media (max-width: 1023px) {
  :root { --bs-header-h: 64px; }

  body { font-size: 16px; }

  .bs-nav-toggle { display: inline-flex; }

  .bs-nav {
    position: fixed;
    top: var(--bs-header-h);
    left: 0;
    right: 0;
    z-index: 85;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    max-height: calc(100vh - var(--bs-header-h));
    max-height: calc(100dvh - var(--bs-header-h));
    overflow-y: auto;
    padding: 20px var(--bs-gutter) 30px;
    border-bottom: 1px solid var(--bs-line);
    background: linear-gradient(180deg, rgba(5, 10, 20, 0.99), rgba(10, 22, 38, 0.99));
    box-shadow: 0 34px 64px -34px rgba(0, 0, 0, 0.95);
  }

  .bs-nav[data-open] { display: flex; }

  .bs-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .bs-nav__list li + li { border-top: 1px solid var(--bs-line-soft); }

  .bs-nav__link {
    padding: 15px 4px;
    font-size: 16.5px;
    font-weight: 600;
    border-radius: 0;
  }

  .bs-nav__link:hover { background: transparent; }

  .bs-nav__link[aria-current="page"]::after {
    left: 4px;
    right: auto;
    width: 22px;
    bottom: 10px;
  }

  .bs-nav__actions {
    display: grid;
    gap: 10px;
    margin-top: 22px;
  }

  .bs-nav__actions .bs-btn { width: 100%; padding: 14px 20px; }

  .bs-section__head {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .bs-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 28px;
  }

  .bs-footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .bs-brand__mark { width: 36px; height: 36px; border-radius: 12px 3px 12px 3px; }
  .bs-brand__glyph { font-size: 18px; }
  .bs-brand__name { font-size: 15px; }
  .bs-brand__meta { font-size: 8.5px; letter-spacing: 0.2em; }

  .bs-nav-toggle__label { display: none; }

  .bs-footer__grid { grid-template-columns: 1fr; gap: 30px; }

  .bs-footer__brand { grid-column: auto; }

  .bs-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}

/* ---------- 12. 无障碍与动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

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

  .bs-btn:hover,
  .bs-panel:hover { transform: none; }
}