/* =========================================================
   博业体育看台 · 共享样式 /assets/site.css
   母题：夜间球场看台 + 数据指挥中心
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; background-color: #0A0F0E; }

body { margin: 0; }

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

h1, h2, h3, h4, p, figure, blockquote { margin: 0; }

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

a { color: inherit; text-decoration: none; }

button { font: inherit; color: inherit; }

:root {
  --bh-black: #0A0F0E;
  --bh-ink: #0F2A24;
  --bh-ink-2: #17403A;
  --bh-line: #24332F;
  --bh-cyan: #35E6D0;
  --bh-orange: #FF7A2F;
  --bh-rose: #FF3D7F;
  --bh-muted: #A9B6B3;
  --bh-paper: #F2F7F5;
  --bh-gold: #F5C664;
  --bh-font-body: system-ui, -apple-system, "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --bh-font-display: "Oswald", "Barlow Condensed", "Arial Narrow", "Noto Sans SC", system-ui, sans-serif;
  --bh-font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Noto Sans SC", monospace;
  --bh-shell: 1240px;
  --bh-radius: 14px;
  --bh-radius-lg: 26px;
  --bh-ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 基础排版 ---------- */

body {
  min-height: 100vh;
  background-color: var(--bh-black);
  background-image:
    radial-gradient(90% 55% at 80% -8%, rgba(53, 230, 208, .10), transparent 62%),
    radial-gradient(65% 45% at 2% 6%, rgba(255, 122, 47, .07), transparent 64%),
    linear-gradient(to right, rgba(36, 51, 47, .40) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 51, 47, .40) 1px, transparent 1px);
  background-size: auto, auto, 88px 88px, 88px 88px;
  color: var(--bh-muted);
  font-family: var(--bh-font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

main { position: relative; z-index: 1; display: block; }

h1, h2, h3, h4 {
  color: var(--bh-paper);
  font-family: var(--bh-font-display);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: .01em;
}

h1 { font-size: clamp(38px, 7vw, 88px); letter-spacing: -.005em; }
h2 { font-size: clamp(26px, 3.6vw, 48px); }
h3 { font-size: clamp(19px, 2vw, 26px); font-weight: 600; }

strong { color: var(--bh-paper); font-weight: 600; }

::selection { background: rgba(53, 230, 208, .28); color: var(--bh-paper); }

/* ---------- 通用工具 ---------- */

.bh-shell {
  width: 100%;
  max-width: var(--bh-shell);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 40px);
}

.bh-section { padding-block: clamp(56px, 7vw, 96px); }
.bh-section--tight { padding-block: clamp(34px, 4.5vw, 64px); }

.bh-divider {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, rgba(53, 230, 208, .55), rgba(36, 51, 47, .25) 48%, transparent);
}

.bh-eyebrow {
  display: inline-block;
  font-family: var(--bh-font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--bh-cyan);
}

.bh-index {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border: 1px solid rgba(53, 230, 208, .38);
  border-radius: 999px;
  font-family: var(--bh-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--bh-cyan);
  background: rgba(53, 230, 208, .06);
}

.bh-display {
  font-family: var(--bh-font-display);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--bh-paper);
}

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

.bh-lede { font-size: 18px; line-height: 1.8; color: var(--bh-muted); }

.bh-prose { max-width: 68ch; font-size: 17px; line-height: 1.85; }
.bh-prose p + p { margin-top: 1.05em; }
.bh-prose a { color: var(--bh-cyan); text-decoration: underline; text-underline-offset: 3px; }
.bh-prose ul, .bh-prose ol { margin-top: 1em; padding-left: 1.1em; list-style: disc; }
.bh-prose li + li { margin-top: .5em; }

.bh-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

/* ---------- 按钮 ---------- */

.bh-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--bh-font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  cursor: pointer;
  transition: transform var(--bh-fast) var(--bh-ease), background-color var(--bh-fast) var(--bh-ease),
              border-color var(--bh-fast) var(--bh-ease), color var(--bh-fast) var(--bh-ease),
              box-shadow var(--bh-fast) var(--bh-ease);
}

.bh-btn--primary { background: var(--bh-orange); color: #170A02; }
.bh-btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 34px -16px rgba(255, 122, 47, .85); }

.bh-btn--ghost {
  background: rgba(23, 64, 58, .42);
  border-color: var(--bh-line);
  color: var(--bh-paper);
}
.bh-btn--ghost:hover { border-color: rgba(53, 230, 208, .6); color: var(--bh-cyan); transform: translateY(-2px); }

/* ---------- 卡片 / 标签 / 图片容器 ---------- */

.bh-card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--bh-line);
  border-radius: var(--bh-radius);
  background: linear-gradient(158deg, rgba(23, 64, 58, .78), rgba(15, 42, 36, .92) 62%);
  transition: transform var(--bh-fast) var(--bh-ease), border-color var(--bh-fast) var(--bh-ease),
              box-shadow var(--bh-fast) var(--bh-ease);
}
.bh-card:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 230, 208, .5);
  box-shadow: 0 22px 46px -30px rgba(53, 230, 208, .8);
}

.bh-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid rgba(53, 230, 208, .36);
  border-radius: 999px;
  font-family: var(--bh-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--bh-cyan);
  background: rgba(53, 230, 208, .06);
}
.bh-tag--orange { border-color: rgba(255, 122, 47, .42); color: var(--bh-orange); background: rgba(255, 122, 47, .08); }
.bh-tag--rose { border-color: rgba(255, 61, 127, .42); color: var(--bh-rose); background: rgba(255, 61, 127, .08); }
.bh-tag--gold { border-color: rgba(245, 198, 100, .42); color: var(--bh-gold); background: rgba(245, 198, 100, .08); }

.bh-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--bh-line);
  border-radius: var(--bh-radius-lg);
  background: linear-gradient(150deg, #123129, #0A0F0E 68%);
}
.bh-media--wide { aspect-ratio: 21 / 9; }
.bh-media--tall { aspect-ratio: 4 / 5; }

.bh-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.5) contrast(1.06) brightness(.78);
}

.bh-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(53, 230, 208, .16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(53, 230, 208, .16) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity: .55;
}

.bh-media__caption {
  position: absolute;
  left: 16px;
  bottom: 14px;
  z-index: 2;
  font-family: var(--bh-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--bh-cyan);
}

.bh-media__label {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  border: 1px dashed rgba(53, 230, 208, .34);
  border-radius: var(--bh-radius-lg);
  font-family: var(--bh-font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: rgba(53, 230, 208, .8);
  text-transform: uppercase;
}

/* ---------- 面包屑 ---------- */

.bh-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--bh-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--bh-muted);
}
.bh-breadcrumb a { color: var(--bh-muted); transition: color var(--bh-fast) var(--bh-ease); }
.bh-breadcrumb a:hover { color: var(--bh-cyan); }
.bh-breadcrumb__sep { color: var(--bh-line); }
.bh-breadcrumb [aria-current="page"] { color: var(--bh-cyan); }

/* ---------- 标签页 ---------- */

.bh-tabs__list {
  display: flex;
  gap: 6px;
  padding: 6px;
  overflow-x: auto;
  border: 1px solid var(--bh-line);
  border-radius: 999px;
  background: rgba(15, 42, 36, .72);
  scrollbar-width: none;
}
.bh-tabs__list::-webkit-scrollbar { display: none; }

.bh-tabs__tab {
  flex: none;
  padding: 9px 18px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--bh-muted);
  font-size: 13px;
  letter-spacing: .12em;
  cursor: pointer;
  transition: background-color var(--bh-fast) var(--bh-ease), color var(--bh-fast) var(--bh-ease);
}
.bh-tabs__tab:hover { color: var(--bh-paper); background: rgba(53, 230, 208, .10); }
.bh-tabs__tab[aria-selected="true"] {
  background: var(--bh-cyan);
  color: #04110F;
  box-shadow: 0 0 24px -8px rgba(53, 230, 208, .9);
}

.bh-tabs__panel { padding-top: clamp(20px, 2.6vw, 32px); }
.bh-tabs__panel[hidden] { display: none; }

/* ---------- 时间轴 ---------- */

.bh-timeline { position: relative; padding-left: 34px; }
.bh-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--bh-cyan), rgba(36, 51, 47, .3));
}
.bh-timeline__item { position: relative; padding-bottom: 34px; }
.bh-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 8px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--bh-cyan);
  border-radius: 50%;
  background: var(--bh-black);
}
.bh-timeline__meta {
  display: block;
  margin-bottom: 6px;
  font-family: var(--bh-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--bh-cyan);
}

/* ---------- 显现动效 ---------- */

.bh-js .bh-rise {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .55s var(--bh-ease), transform .55s var(--bh-ease);
}
.bh-js .bh-rise.is-visible { opacity: 1; transform: none; }

/* ---------- 焦点 ---------- */

:focus-visible {
  outline: 2px solid var(--bh-cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 200;
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--bh-cyan);
  color: #04110F;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  transform: translateY(-190%);
  transition: transform .2s var(--bh-ease);
}
.skip-link:focus { transform: translateY(0); }

/* =========================================================
   页头：悬浮胶囊浮岛
   ========================================================= */

.bh-header {
  position: sticky;
  top: 0;
  z-index: 80;
  padding: 12px clamp(10px, 2.4vw, 22px) 0;
}

.bh-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  width: 100%;
  max-width: 1360px;
  min-height: 64px;
  margin-inline: auto;
  padding: 8px 10px 8px 16px;
  border: 1px solid var(--bh-line);
  border-radius: 999px;
  background-color: rgba(15, 42, 36, .88);
  background-image:
    linear-gradient(90deg, rgba(53, 230, 208, .12), rgba(53, 230, 208, 0) 46%),
    linear-gradient(to right, rgba(36, 51, 47, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 51, 47, .55) 1px, transparent 1px);
  background-size: auto, 34px 34px, 34px 34px;
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  box-shadow: 0 20px 44px -30px rgba(0, 0, 0, .95);
  transition: min-height .3s var(--bh-ease), background-color .3s var(--bh-ease),
              border-color .3s var(--bh-ease);
}

.bh-header[data-scrolled="true"] .bh-header__inner {
  min-height: 54px;
  background-color: rgba(10, 15, 14, .95);
  border-color: #2E4B45;
}

.bh-brand { display: inline-flex; align-items: center; gap: 10px; flex: none; }

.bh-brand__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(53, 230, 208, .5);
  border-radius: 12px;
  background: linear-gradient(140deg, rgba(53, 230, 208, .2), rgba(53, 230, 208, 0) 72%);
  color: var(--bh-cyan);
  font-family: var(--bh-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
}

.bh-brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.bh-brand__name { color: var(--bh-paper); font-size: 16px; font-weight: 700; letter-spacing: .06em; }
.bh-brand__sub {
  font-family: var(--bh-font-mono);
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--bh-muted);
}

.bh-nav {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: 0;
}

.bh-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.bh-nav__list::-webkit-scrollbar { display: none; }

.bh-nav__link {
  display: block;
  padding: 9px 14px;
  border-radius: 999px;
  color: var(--bh-muted);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .14em;
  white-space: nowrap;
  transition: color var(--bh-fast) var(--bh-ease), background-color var(--bh-fast) var(--bh-ease);
}
.bh-nav__link:hover { color: var(--bh-paper); background: rgba(53, 230, 208, .10); }
.bh-nav__link[aria-current="page"] {
  color: #04110F;
  background: var(--bh-cyan);
  box-shadow: 0 0 22px -6px rgba(53, 230, 208, .85);
}

.bh-nav__by {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border: 1px solid rgba(53, 230, 208, .45);
  border-radius: 999px;
  color: var(--bh-cyan);
  font-family: var(--bh-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  white-space: nowrap;
  transition: background-color var(--bh-fast) var(--bh-ease);
}
.bh-nav__by:hover { background: rgba(53, 230, 208, .12); }

.bh-nav__by-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--bh-orange);
  box-shadow: 0 0 0 3px rgba(255, 122, 47, .18);
}

.bh-cta {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--bh-orange);
  color: #170A02;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  white-space: nowrap;
  transition: transform var(--bh-fast) var(--bh-ease), box-shadow var(--bh-fast) var(--bh-ease);
}
.bh-cta:hover { transform: translateY(-2px); box-shadow: 0 16px 32px -16px rgba(255, 122, 47, .9); }

.bh-nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--bh-line);
  border-radius: 999px;
  background: rgba(23, 64, 58, .6);
  color: var(--bh-paper);
  font-size: 13px;
  letter-spacing: .12em;
  cursor: pointer;
}
.bh-nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; }
.bh-nav-toggle__bars i { display: block; width: 15px; height: 1.5px; background: var(--bh-cyan); transition: transform var(--bh-fast) var(--bh-ease); }
.bh-nav-toggle[aria-expanded="true"] .bh-nav-toggle__bars i:first-child { transform: translateY(4.5px) rotate(45deg); }
.bh-nav-toggle[aria-expanded="true"] .bh-nav-toggle__bars i:last-child { transform: translateY(-4.5px) rotate(-45deg); }
.bh-nav-toggle[aria-expanded="true"] .bh-nav-toggle__bars i:nth-child(2) { opacity: 0; }

.bh-progress {
  display: block;
  height: 2px;
  max-width: 1360px;
  margin: 8px auto 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--bh-cyan), var(--bh-orange) 72%, var(--bh-rose));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .12s linear;
}

/* =========================================================
   页脚
   ========================================================= */

.bh-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(60px, 8vw, 120px);
  border-top: 1px solid var(--bh-line);
  background: linear-gradient(180deg, rgba(15, 42, 36, .9), #0A0F0E 76%);
  color: var(--bh-muted);
  overflow: hidden;
}

.bh-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(36, 51, 47, .5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 51, 47, .5) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .6;
}

.bh-footer__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(44px, 5vw, 76px) 26px;
}

.bh-footer__coord {
  position: absolute;
  top: 22px;
  right: clamp(18px, 4vw, 44px);
  z-index: 2;
  padding: 4px 12px;
  border: 1px solid rgba(53, 230, 208, .36);
  border-radius: 999px;
  font-family: var(--bh-font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--bh-cyan);
}

.bh-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr) minmax(0, .95fr);
  gap: clamp(26px, 4vw, 60px);
  padding-bottom: clamp(30px, 4vw, 52px);
  border-bottom: 1px solid var(--bh-line);
}

.bh-footer__brand { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; }
.bh-footer__tagline { margin: 0; font-size: 15px; color: var(--bh-muted); }
.bh-footer__badge {
  padding: 4px 12px;
  border: 1px solid rgba(245, 198, 100, .38);
  border-radius: 999px;
  font-family: var(--bh-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--bh-gold);
}

.bh-footer__col { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }

.bh-footer__title {
  font-family: var(--bh-font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--bh-cyan);
}

.bh-footer__links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 20px;
  width: 100%;
}

.bh-footer__link {
  display: inline-block;
  padding-block: 4px;
  color: var(--bh-muted);
  font-size: 15px;
  transition: color var(--bh-fast) var(--bh-ease), transform var(--bh-fast) var(--bh-ease);
}
.bh-footer__link:hover { color: var(--bh-cyan); transform: translateX(3px); }

.bh-footer__hint { font-size: 15px; line-height: 1.7; max-width: 30ch; }

.bh-footer__mid {
  display: grid;
  gap: 10px;
  max-width: 820px;
  padding-block: clamp(28px, 3.5vw, 44px);
}

.bh-contact-list { display: grid; }

.bh-contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  padding-block: 11px;
  border-bottom: 1px dashed rgba(36, 51, 47, .95);
}

.bh-contact-item__label {
  min-width: 76px;
  font-family: var(--bh-font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--bh-cyan);
}

.bh-contact-item__value {
  color: var(--bh-paper);
  font-family: var(--bh-font-mono);
  font-size: 14px;
  word-break: break-word;
}

.bh-copy {
  padding: 4px 12px;
  border: 1px solid var(--bh-line);
  border-radius: 999px;
  background: rgba(23, 64, 58, .6);
  color: var(--bh-muted);
  font-size: 12px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: border-color var(--bh-fast) var(--bh-ease), color var(--bh-fast) var(--bh-ease);
}
.bh-copy:hover { border-color: rgba(53, 230, 208, .6); color: var(--bh-cyan); }

.bh-copy__status { font-family: var(--bh-font-mono); font-size: 12px; color: var(--bh-muted); }
.bh-copy__status.is-ok { color: var(--bh-cyan); }
.bh-copy__status.is-fail { color: var(--bh-rose); }

.bh-footer__note { font-size: 14px; line-height: 1.7; color: var(--bh-muted); }

.bh-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 26px;
  padding-top: 22px;
  border-top: 1px solid var(--bh-line);
  font-family: var(--bh-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}

.bh-legal { display: flex; flex-wrap: wrap; gap: 18px; }
.bh-legal .bh-footer__link { font-family: var(--bh-font-mono); font-size: 13px; letter-spacing: .08em; }

.bh-icp { color: var(--bh-muted); }
.bh-sign { margin-left: auto; color: var(--bh-muted); }

/* =========================================================
   响应式
   ========================================================= */

@media (max-width: 1180px) {
  .bh-nav__by { display: none; }
  .bh-nav__link { padding: 9px 11px; font-size: 12px; letter-spacing: .1em; }
  .bh-footer__coord { display: none; }
}

@media (max-width: 1024px) {
  .bh-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .bh-footer__top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bh-footer__brand { grid-column: 1 / -1; }
  .bh-sign { margin-left: 0; }
}

@media (max-width: 900px) {
  .bh-header { padding-top: 8px; }

  .bh-header__inner {
    flex-wrap: wrap;
    row-gap: 8px;
    padding: 8px 10px 8px 12px;
    border-radius: 26px;
  }

  .bh-brand { order: 1; }
  .bh-cta { order: 2; margin-left: auto; padding: 10px 16px; font-size: 13px; }
  .bh-nav-toggle { order: 3; display: inline-flex; }

  .bh-nav {
    order: 4;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 10px;
    border: 1px solid var(--bh-line);
    border-radius: 20px;
    background: rgba(10, 15, 14, .96);
  }

  .bh-js .bh-nav { display: none; }
  .bh-js .bh-nav[data-open="true"] { display: flex; }

  .bh-nav__list { flex-direction: column; align-items: stretch; gap: 4px; overflow: visible; }
  .bh-nav__link { padding: 12px 14px; border-radius: 14px; font-size: 14px; }
  .bh-nav__by { justify-content: center; margin-top: 4px; padding: 11px 14px; }

  .bh-footer__top { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .bh-footer__brand { grid-column: auto; }
  .bh-footer__bottom { align-items: flex-start; }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .bh-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
  .bh-section { padding-block: 48px; }
  .bh-brand__sub { display: none; }
  .bh-footer__links { grid-template-columns: minmax(0, 1fr); }
  .bh-contact-item__label { min-width: 100%; }
  .bh-btn--primary { width: 100%; }
}

/* =========================================================
   降低动效
   ========================================================= */

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