/* ============================================================
   B体育主站 · 共享样式表 /assets/site.css
   深空蓝底 + 荧光青 / 电光橙 / 赛场绿
   斜切 4° 与 8° · 1px 极细描边 · 双层微阴影
   ============================================================ */

/* ---------- 1. reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid var(--bs-cyan); outline-offset: 3px; border-radius: 2px; }

/* ---------- 2. tokens ---------- */
:root {
  --bs-space: #0A1830;
  --bs-night: #12263F;
  --bs-ink: #17110D;
  --bs-paper: #F3E9DA;
  --bs-cyan: #35E0D0;
  --bs-orange: #FF6A2B;
  --bs-green: #3FCE7A;
  --bs-gray: #8FA3B8;
  --bs-white: #F7FAFF;
  --bs-magenta: #FF3D6E;

  --bs-line: rgba(143, 163, 184, .22);
  --bs-line-soft: rgba(143, 163, 184, .13);
  --bs-line-cyan: rgba(53, 224, 208, .34);
  --bs-shadow-1: 0 1px 0 rgba(247, 250, 255, .04), 0 10px 24px rgba(3, 10, 22, .45);
  --bs-shadow-2: 0 1px 0 rgba(247, 250, 255, .05), 0 22px 48px rgba(3, 10, 22, .55);
  --bs-shadow-paper: 0 1px 0 rgba(23, 17, 13, .04), 0 12px 26px rgba(23, 17, 13, .10);

  --bs-font-display: "Impact", "Haettenschweiler", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --bs-font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --bs-font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --bs-header-h: 76px;
  --bs-radius: 14px;
  --bs-radius-lg: 22px;
  --bs-gutter: 24px;
  --bs-maxw: 1280px;
  --bs-slant-a: 4deg;
  --bs-slant-b: 8deg;
}

/* ---------- 3. base / 中文排版 ---------- */
body {
  background-color: var(--bs-space);
  background-image:
    radial-gradient(80% 55% at 78% -10%, rgba(53, 224, 208, .13), transparent 62%),
    radial-gradient(60% 45% at 4% 8%, rgba(255, 106, 43, .10), transparent 60%);
  background-repeat: no-repeat;
  color: var(--bs-white);
  font-family: var(--bs-font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  overflow-x: hidden;
}
html.bs-nav-open { overflow: hidden; }

/* ---------- 4. 排版组件 ---------- */
.bs-display {
  font-family: var(--bs-font-display);
  font-weight: 900;
  font-size: clamp(44px, 9vw, 96px);
  line-height: .94;
  letter-spacing: -.02em;
  text-transform: uppercase;
}
.bs-h2 {
  font-family: var(--bs-font-display);
  font-weight: 900;
  font-size: clamp(28px, 4.4vw, 40px);
  line-height: 1.06;
  letter-spacing: -.015em;
}
.bs-h3 {
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.005em;
}
.bs-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--bs-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--bs-cyan);
}
.bs-eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--bs-orange);
  transform: skewX(-24deg);
}
.bs-lede {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.7;
  color: rgba(247, 250, 255, .84);
  max-width: 60ch;
}
.bs-text { max-width: 68ch; color: rgba(247, 250, 255, .80); }
.bs-text + .bs-text { margin-top: 16px; }
.bs-num {
  font-family: var(--bs-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}
.bs-rule { height: 1px; background: var(--bs-line); border: 0; }
.bs-diag {
  height: 1px;
  background: linear-gradient(90deg, var(--bs-cyan), rgba(53, 224, 208, 0));
  transform: skewY(calc(var(--bs-slant-a) * -1));
  border: 0;
}
.bs-tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--bs-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--bs-space);
  background: var(--bs-cyan);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 90% 100%, 0 100%);
}
.bs-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bs-green);
  box-shadow: 0 0 0 4px rgba(63, 206, 122, .16);
  vertical-align: middle;
}
.bs-sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. 布局容器 ---------- */
.bs-container {
  width: 100%;
  max-width: var(--bs-maxw);
  margin-inline: auto;
  padding-inline: var(--bs-gutter);
}
.bs-main { padding-top: var(--bs-header-h); }
.bs-main--flush { padding-top: 0; }
.bs-section { padding-block: clamp(48px, 7vw, 96px); position: relative; }
.bs-section--night { background: var(--bs-night); border-block: 1px solid var(--bs-line); }
.bs-section--panel { background: rgba(18, 38, 63, .55); border-block: 1px solid var(--bs-line-soft); }
.bs-section--paper {
  background: var(--bs-paper);
  color: var(--bs-ink);
  border-block: 1px solid rgba(23, 17, 13, .12);
}
.bs-section--paper .bs-text,
.bs-section--paper .bs-lede { color: #3A2E24; }
.bs-section--paper .bs-eyebrow { color: #9A4A16; }
.bs-section--paper .bs-eyebrow::before { background: var(--bs-ink); }
.bs-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 28px 24px;
}
.bs-col-3 { grid-column: span 3; }
.bs-col-4 { grid-column: span 4; }
.bs-col-5 { grid-column: span 5; }
.bs-col-6 { grid-column: span 6; }
.bs-col-7 { grid-column: span 7; }
.bs-col-8 { grid-column: span 8; }
.bs-col-9 { grid-column: span 9; }
.bs-col-12 { grid-column: span 12; }

/* ---------- 6. 按钮 ---------- */
.bs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: transform .18s ease, background-color .18s ease, border-color .18s ease, color .18s ease, box-shadow .18s ease;
}
.bs-btn--primary {
  background: var(--bs-orange);
  color: #1B0B03;
  box-shadow: 0 8px 20px rgba(255, 106, 43, .26);
}
.bs-btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(255, 106, 43, .36); }
.bs-btn--ghost {
  background: transparent;
  border-color: var(--bs-line-cyan);
  color: var(--bs-cyan);
}
.bs-btn--ghost:hover { background: rgba(53, 224, 208, .10); transform: translateY(-2px); }
.bs-btn--quiet {
  background: rgba(247, 250, 255, .06);
  border-color: rgba(247, 250, 255, .16);
  color: var(--bs-white);
}
.bs-btn--quiet:hover { background: rgba(247, 250, 255, .12); }

/* ---------- 7. 卡片 / 媒体 / 面包屑 ---------- */
.bs-card {
  position: relative;
  padding: 24px;
  background: rgba(18, 38, 63, .72);
  border: 1px solid var(--bs-line);
  border-radius: var(--bs-radius);
  box-shadow: var(--bs-shadow-1);
  overflow: hidden;
}
.bs-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 30%, rgba(53, 224, 208, .16) 50%, transparent 68%);
  transform: translateX(-120%);
  transition: transform .6s ease;
  pointer-events: none;
}
.bs-card:hover::after { transform: translateX(120%); }
.bs-card__title { font-size: 20px; font-weight: 800; line-height: 1.3; }
.bs-card__meta {
  font-family: var(--bs-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--bs-gray);
}
.bs-card__body { margin-top: 10px; color: rgba(247, 250, 255, .78); font-size: 15px; }

.bs-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--bs-radius);
  border: 1px solid var(--bs-line);
  background-color: var(--bs-night);
  background-image:
    radial-gradient(120% 80% at 10% 0%, rgba(53, 224, 208, .18), transparent 60%),
    radial-gradient(90% 70% at 100% 100%, rgba(255, 106, 43, .14), transparent 62%),
    repeating-linear-gradient(90deg, rgba(143, 163, 184, .10) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, rgba(143, 163, 184, .10) 0 1px, transparent 1px 48px);
  box-shadow: var(--bs-shadow-1);
}
.bs-media__img { width: 100%; height: 100%; object-fit: cover; }
.bs-media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(247, 250, 255, .82);
  background: linear-gradient(0deg, rgba(10, 24, 48, .92), rgba(10, 24, 48, 0));
}
.bs-media--16x9 { aspect-ratio: 16 / 9; }
.bs-media--4x3 { aspect-ratio: 4 / 3; }
.bs-media--1x1 { aspect-ratio: 1 / 1; }
.bs-media--3x4 { aspect-ratio: 3 / 4; }
.bs-media--tall { min-height: 340px; }

.bs-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--bs-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--bs-gray);
}
.bs-crumbs__item { display: inline-flex; align-items: center; gap: 10px; }
.bs-crumbs__item + .bs-crumbs__item::before { content: "/"; color: var(--bs-line-cyan); }
.bs-crumbs a:hover { color: var(--bs-cyan); }

/* ---------- 8. skip link ---------- */
.bs-skip {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 200;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 700;
  color: var(--bs-space);
  background: var(--bs-cyan);
  border-radius: 0 0 var(--bs-radius) var(--bs-radius);
  transition: top .2s ease;
}
.bs-skip:focus { top: 0; }

/* ---------- 9. header ---------- */
.bs-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .2s ease, border-color .2s ease, box-shadow .2s ease, backdrop-filter .2s ease;
}
.bs-header[data-scrolled="true"] {
  background: var(--bs-space);
  border-bottom-color: var(--bs-line);
  box-shadow: 0 14px 32px rgba(3, 10, 22, .5);
}
.bs-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--bs-cyan), var(--bs-orange));
  will-change: transform;
  pointer-events: none;
}
.bs-header__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: var(--bs-maxw);
  min-height: var(--bs-header-h);
  margin-inline: auto;
  padding-inline: var(--bs-gutter);
}

.bs-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}
.bs-brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-family: var(--bs-font-display);
  font-size: 21px;
  font-weight: 900;
  color: var(--bs-space);
  background: var(--bs-cyan);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}
.bs-brand__text { display: block; }
.bs-brand__name {
  display: block;
  font-size: 17px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: .02em;
  color: var(--bs-white);
}
.bs-brand__line {
  display: block;
  margin-top: 2px;
  font-family: var(--bs-font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--bs-cyan);
}
.bs-brand--footer .bs-brand__name { font-size: 18px; }

.bs-nav { margin-left: auto; }
.bs-nav__list { display: flex; align-items: center; gap: 2px; }
.bs-nav__item { position: relative; }
.bs-nav__link {
  position: relative;
  display: block;
  padding: 10px 14px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(247, 250, 255, .78);
  border-radius: 8px;
  transition: color .18s ease, background-color .18s ease;
}
.bs-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  background: var(--bs-cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .22s ease;
}
.bs-nav__link:hover { color: var(--bs-white); background: rgba(247, 250, 255, .05); }
.bs-nav__link:hover::after { transform: scaleX(1); }
.bs-nav__link[aria-current="page"] { color: var(--bs-white); font-weight: 700; }
.bs-nav__link[aria-current="page"]::after { transform: scaleX(1); }
.bs-nav__foot { display: none; }

.bs-header__cta { flex: 0 0 auto; }

.bs-navtoggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border: 1px solid var(--bs-line-cyan);
  border-radius: 10px;
  place-items: center;
}
.bs-navtoggle__bars,
.bs-navtoggle__bars::before,
.bs-navtoggle__bars::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--bs-cyan);
  transition: transform .2s ease, opacity .2s ease;
}
.bs-navtoggle__bars { position: relative; }
.bs-navtoggle__bars::before,
.bs-navtoggle__bars::after { content: ""; position: absolute; left: 0; }
.bs-navtoggle__bars::before { top: -6px; }
.bs-navtoggle__bars::after { top: 6px; }
.bs-navtoggle[aria-expanded="true"] .bs-navtoggle__bars { background: transparent; }
.bs-navtoggle[aria-expanded="true"] .bs-navtoggle__bars::before { transform: translateY(6px) rotate(45deg); background: var(--bs-orange); }
.bs-navtoggle[aria-expanded="true"] .bs-navtoggle__bars::after { transform: translateY(-6px) rotate(-45deg); background: var(--bs-orange); }

/* ---------- 10. footer ---------- */
.bs-footer {
  position: relative;
  margin-top: 0;
  padding-block: clamp(44px, 6vw, 72px) 28px;
  background: var(--bs-night);
  border-top: 1px solid var(--bs-line-cyan);
  color: var(--bs-white);
  overflow: hidden;
}
.bs-footer__glow {
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 180px;
  background:
    linear-gradient(180deg, rgba(53, 224, 208, .10), transparent 70%),
    repeating-linear-gradient(90deg, rgba(143, 163, 184, .10) 0 1px, transparent 1px 56px);
  pointer-events: none;
}
.bs-footer__grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 36px 24px;
}
.bs-footer__brand { grid-column: span 3; }
.bs-footer__col { grid-column: span 2; }
.bs-footer__col--contact { grid-column: span 3; }
.bs-footer__note {
  margin-top: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 250, 255, .70);
  max-width: 34ch;
}
.bs-footer__status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
  font-family: var(--bs-font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--bs-green);
}
.bs-footer__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--bs-cyan);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--bs-line-soft);
}
.bs-footer__list { margin-top: 14px; display: grid; gap: 10px; }
.bs-footer__link {
  font-size: 14px;
  color: rgba(247, 250, 255, .76);
  transition: color .16s ease, padding-left .16s ease;
}
.bs-footer__link:hover { color: var(--bs-cyan); padding-left: 4px; }
.bs-footer__contactline {
  display: grid;
  gap: 2px;
  font-size: 14px;
  line-height: 1.6;
}
.bs-footer__label {
  font-family: var(--bs-font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--bs-gray);
}
.bs-footer__value { color: rgba(247, 250, 255, .84); overflow-wrap: anywhere; }
.bs-footer__legal {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  margin-top: clamp(32px, 4vw, 52px);
  padding-top: 20px;
  border-top: 1px solid var(--bs-line-soft);
}
.bs-footer__legalitem {
  font-family: var(--bs-font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--bs-gray);
}

/* ---------- 11. 移动短路径条 ---------- */
.bs-dock {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 90;
  display: none;
  gap: 8px;
  padding: 8px;
  background: rgba(18, 38, 63, .94);
  border: 1px solid var(--bs-line-cyan);
  border-radius: var(--bs-radius);
  box-shadow: var(--bs-shadow-2);
  backdrop-filter: blur(10px);
}
.bs-dock__link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--bs-space);
  background: var(--bs-cyan);
  border-radius: 10px;
}
.bs-dock__link--alt {
  color: var(--bs-white);
  background: rgba(247, 250, 255, .08);
  border: 1px solid var(--bs-line);
}

/* ---------- 12. 动效 ---------- */
.bs-js [data-reveal] {
  opacity: 0;
  transform: translate3d(-12px, 12px, 0);
  transition: opacity .32s cubic-bezier(.2, .7, .3, 1), transform .32s cubic-bezier(.2, .7, .3, 1);
}
.bs-js [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1024px) {
  .bs-col-3, .bs-col-4, .bs-col-5 { grid-column: span 6; }
  .bs-col-7, .bs-col-8, .bs-col-9 { grid-column: span 12; }
  .bs-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 28px; }
  .bs-footer__brand,
  .bs-footer__col,
  .bs-footer__col--contact { grid-column: span 1; }
}

@media (max-width: 900px) {
  :root { --bs-header-h: 64px; --bs-gutter: 18px; }
  .bs-header[data-scrolled="true"] { box-shadow: 0 10px 24px rgba(3, 10, 22, .55); }
  .bs-navtoggle { display: grid; }
  .bs-header__cta { display: none; }
  .bs-brand__name { font-size: 16px; }
  .bs-brand__line { font-size: 10px; }

  .bs-nav {
    position: fixed;
    inset-inline: 0;
    top: var(--bs-header-h);
    z-index: 95;
    max-height: calc(100vh - var(--bs-header-h));
    overflow-y: auto;
    padding: 18px 18px 28px;
    background: var(--bs-night);
    border-top: 1px solid var(--bs-line);
    border-bottom: 1px solid var(--bs-line-cyan);
    box-shadow: var(--bs-shadow-2);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
  }
  .bs-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .bs-nav__list { display: grid; gap: 0; }
  .bs-nav__link {
    padding: 14px 4px;
    font-size: 17px;
    border-bottom: 1px solid var(--bs-line-soft);
    border-radius: 0;
  }
  .bs-nav__link::after { left: 0; right: auto; width: 40px; bottom: 8px; }
  .bs-nav__link:hover { background: transparent; }
  .bs-nav__foot { display: block; margin-top: 20px; }
  .bs-nav__cta { width: 100%; }

  .bs-dock { display: grid; grid-template-columns: 1fr 1fr; }
  .bs-footer { padding-bottom: 96px; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .bs-grid { gap: 22px 16px; }
  .bs-col-3, .bs-col-4, .bs-col-5, .bs-col-6 { grid-column: span 12; }
  .bs-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .bs-footer__legal { gap: 6px 18px; }
  .bs-card { padding: 20px; }
}

/* ---------- 14. 降低动效偏好 ---------- */
@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: 0ms !important;
  }
  .bs-js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .bs-card::after { display: none; }
  .bs-btn:hover,
  .bs-footer__link:hover { transform: none; }
}