/* ==========================================================================
   买球中心 · 共享外壳与通用组件  /assets/site.css
   ========================================================================== */

:root {
  --bh-paper: #F4EFE3;
  --bh-ink: #14231B;
  --bh-green: #0B6B3A;
  --bh-green-deep: #064326;
  --bh-orange: #F26B21;
  --bh-orange-deep: #A63E0A;
  --bh-blue: #1D5FA8;
  --bh-blue-pale: #DCE8F5;
  --bh-cream: #FFFCF4;
  --bh-line: #A9B6A4;

  --bh-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --bh-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --bh-container: 1240px;
  --bh-gutter: clamp(16px, 4vw, 48px);
  --bh-ease: cubic-bezier(.22, .61, .36, 1);
}

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

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

body {
  margin: 0;
  background-color: var(--bh-paper);
  color: var(--bh-ink);
  font-family: var(--bh-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

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

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

h1, h2, h3 {
  text-wrap: balance;
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.24;
}

strong, b { font-weight: 800; }

/* ---------- 焦点 ---------- */
:focus-visible {
  outline: 3px solid var(--bh-blue);
  outline-offset: 2px;
}

.bh-header :focus-visible { outline-color: var(--bh-orange-deep); }
.bh-footer :focus-visible { outline: 3px solid var(--bh-orange); outline-offset: 2px; }

.bh-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;
}

/* ---------- 布局基础 ---------- */
.bh-container {
  width: 100%;
  max-width: var(--bh-container);
  margin-inline: auto;
  padding-inline: var(--bh-gutter);
}

.bh-section {
  padding-block: clamp(32px, 5vw, 64px);
}

.bh-rule {
  height: 1px;
  border: 0;
  background-color: var(--bh-line);
}

.bh-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 28px);
}

/* ---------- 跳过链接 ---------- */
.bh-skip {
  position: fixed;
  left: 16px;
  top: -120px;
  z-index: 400;
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--bh-green);
  color: var(--bh-cream);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .08em;
  transition: top .18s var(--bh-ease);
}

.bh-skip:focus {
  top: 12px;
}

/* ---------- 页头 ---------- */
.bh-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--bh-paper);
  border-bottom: 1px solid var(--bh-line);
  color: var(--bh-ink);
  transition: box-shadow .28s var(--bh-ease);
}

.bh-header::before {
  content: "";
  display: block;
  height: 3px;
  background-image: linear-gradient(90deg, var(--bh-green) 0 38%, var(--bh-orange) 38% 64%, var(--bh-blue) 64% 100%);
}

.bh-header.is-stuck {
  box-shadow: 0 14px 34px -26px rgba(20, 35, 27, .85);
}

.bh-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  pointer-events: none;
  overflow: hidden;
}

.bh-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--bh-green), var(--bh-orange) 58%, var(--bh-blue));
  transition: transform .12s linear;
}

.bh-header__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding-block: clamp(10px, 1.6vw, 20px);
  transition: padding .28s var(--bh-ease);
}

.bh-header.is-stuck .bh-header__inner {
  padding-block: 6px;
}

.bh-header__meta {
  min-width: 0;
}

.bh-kicker {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--bh-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: .14em;
  color: var(--bh-green);
  white-space: nowrap;
}

.bh-kicker::before {
  content: "";
  flex: 0 0 18px;
  height: 2px;
  background-color: var(--bh-orange);
}

.bh-brand {
  justify-self: center;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  padding: 2px 8px;
  color: var(--bh-ink);
  text-align: center;
}

.bh-brand__name {
  font-size: clamp(22px, 3.1vw, 34px);
  font-weight: 900;
  letter-spacing: .14em;
  line-height: 1.1;
  transition: font-size .28s var(--bh-ease), color .18s var(--bh-ease);
}

.bh-brand__sub {
  font-family: var(--bh-mono);
  font-size: 10px;
  letter-spacing: .4em;
  text-transform: uppercase;
  color: var(--bh-orange-deep);
  transition: opacity .28s var(--bh-ease);
}

.bh-header.is-stuck .bh-brand__name { font-size: clamp(17px, 2.1vw, 22px); }
.bh-header.is-stuck .bh-brand__sub { opacity: 0; }

.bh-brand:hover .bh-brand__name { color: var(--bh-green); }

.bh-utility {
  justify-self: end;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.bh-utility__link {
  display: inline-flex;
  align-items: center;
  padding: 7px 13px;
  border: 1px solid var(--bh-ink);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: .08em;
  white-space: nowrap;
  color: var(--bh-ink);
  transition: background-color .18s var(--bh-ease), color .18s var(--bh-ease), border-color .18s var(--bh-ease);
}

.bh-utility__link:hover {
  background-color: var(--bh-ink);
  color: var(--bh-paper);
}

.bh-utility__link--accent {
  background-color: var(--bh-orange);
  border-color: var(--bh-orange);
  color: var(--bh-cream);
}

.bh-utility__link--accent:hover {
  background-color: var(--bh-orange-deep);
  border-color: var(--bh-orange-deep);
  color: var(--bh-cream);
}

/* 移动导航按钮 */
.bh-nav-toggle {
  display: none;
  justify-self: end;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--bh-ink);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
  color: var(--bh-ink);
}

.bh-nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
}

.bh-nav-toggle__bars span {
  display: block;
  height: 2px;
  background-color: var(--bh-ink);
  transition: transform .2s var(--bh-ease), opacity .2s var(--bh-ease);
}

.bh-header[data-open="true"] .bh-nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.bh-header[data-open="true"] .bh-nav-toggle__bars span:nth-child(2) { opacity: 0; }
.bh-header[data-open="true"] .bh-nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 主导航 */
.bh-nav {
  border-top: 1px solid var(--bh-line);
  background-color: rgba(255, 252, 244, .55);
}

.bh-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  justify-content: center;
  gap: clamp(2px, 1.6vw, 24px);
  padding-block: 2px;
}

.bh-nav__item {
  display: block;
}

.bh-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px clamp(6px, 1.1vw, 16px);
  border-bottom: 3px solid transparent;
  font-size: clamp(13px, 1.1vw, 15px);
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--bh-ink);
  transition: color .18s var(--bh-ease), border-color .18s var(--bh-ease), background-color .18s var(--bh-ease);
}

.bh-nav__num {
  font-family: var(--bh-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--bh-blue);
}

.bh-nav__link:hover {
  color: var(--bh-green);
  border-bottom-color: var(--bh-green);
  background-color: rgba(11, 107, 58, .07);
}

.bh-nav__link[aria-current="page"] {
  color: var(--bh-green-deep);
  border-bottom-color: var(--bh-orange);
  background-color: rgba(242, 107, 33, .08);
}

.bh-nav__link[aria-current="page"] .bh-nav__num {
  color: var(--bh-orange-deep);
}

.bh-header.is-stuck .bh-nav__link {
  padding-block: 7px;
}

/* ---------- 页脚 ---------- */
.bh-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background-color: var(--bh-ink);
  color: var(--bh-paper);
  padding-top: clamp(34px, 5vw, 64px);
}

.bh-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background-image: linear-gradient(90deg, var(--bh-green) 0 38%, var(--bh-orange) 38% 66%, var(--bh-blue) 66% 100%);
}

.bh-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.95fr);
  gap: clamp(26px, 5vw, 72px);
  padding-bottom: clamp(26px, 4vw, 44px);
  border-bottom: 1px solid rgba(169, 182, 164, .34);
}

.bh-footer__brand {
  min-width: 0;
}

.bh-footer__eyebrow {
  font-family: var(--bh-mono);
  font-size: 11px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--bh-line);
}

.bh-footer__name {
  margin-top: 6px;
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 900;
  letter-spacing: .12em;
  line-height: 1.2;
  color: var(--bh-cream);
}

.bh-footer__summary {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 239, 227, .76);
}

.bh-footer__brand .bh-btn {
  margin-top: 22px;
}

.bh-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 36px);
  min-width: 0;
}

.bh-footer__coltitle {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(169, 182, 164, .32);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: .18em;
  color: var(--bh-cream);
}

.bh-footer__colnum {
  font-family: var(--bh-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--bh-orange);
}

.bh-footer__list {
  margin-top: 14px;
  display: grid;
  gap: 9px;
}

.bh-footer__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  color: rgba(244, 239, 227, .82);
  transition: color .18s var(--bh-ease);
}

.bh-footer__link::before {
  content: "";
  width: 10px;
  height: 1px;
  background-color: var(--bh-orange);
  transition: width .18s var(--bh-ease);
}

.bh-footer__link:hover { color: var(--bh-cream); }
.bh-footer__link:hover::before { width: 20px; }

.bh-footer__contact {
  padding-block: clamp(20px, 3vw, 30px);
  border-bottom: 1px solid rgba(169, 182, 164, .34);
}

.bh-footer__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px clamp(20px, 3vw, 40px);
}

.bh-fact dt {
  font-family: var(--bh-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--bh-line);
}

.bh-fact dd {
  margin-top: 6px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 239, 227, .92);
  word-break: break-word;
}

.bh-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 18px clamp(20px, 3vw, 30px);
  font-family: var(--bh-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: rgba(244, 239, 227, .62);
}

.bh-to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 13px;
  border: 1px solid rgba(169, 182, 164, .5);
  font-family: var(--bh-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(244, 239, 227, .9);
  transition: background-color .18s var(--bh-ease), border-color .18s var(--bh-ease), color .18s var(--bh-ease);
}

.bh-to-top:hover {
  background-color: var(--bh-green);
  border-color: var(--bh-green);
  color: var(--bh-cream);
}

/* ---------- 按钮 ---------- */
.bh-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid var(--bh-ink);
  background-color: var(--bh-ink);
  color: var(--bh-paper);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .07em;
  line-height: 1.4;
  text-align: center;
  transition: background-color .18s var(--bh-ease), color .18s var(--bh-ease), border-color .18s var(--bh-ease), transform .18s var(--bh-ease);
}

.bh-btn:hover {
  transform: translateY(-2px);
  background-color: var(--bh-green-deep);
  border-color: var(--bh-green-deep);
  color: var(--bh-cream);
}

.bh-btn--orange {
  background-color: var(--bh-orange);
  border-color: var(--bh-orange);
  color: var(--bh-cream);
}

.bh-btn--orange:hover {
  background-color: var(--bh-orange-deep);
  border-color: var(--bh-orange-deep);
  color: var(--bh-cream);
}

.bh-btn--green {
  background-color: var(--bh-green);
  border-color: var(--bh-green);
  color: var(--bh-cream);
}

.bh-btn--green:hover {
  background-color: var(--bh-green-deep);
  border-color: var(--bh-green-deep);
}

.bh-btn--ghost {
  background-color: transparent;
  color: var(--bh-ink);
}

.bh-btn--ghost:hover {
  background-color: var(--bh-ink);
  border-color: var(--bh-ink);
  color: var(--bh-paper);
}

.bh-btn--sm {
  padding: 9px 16px;
  font-size: 12.5px;
  letter-spacing: .1em;
}

/* ---------- 面包屑 ---------- */
.bh-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--bh-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--bh-green);
}

.bh-breadcrumb a {
  color: var(--bh-green);
  border-bottom: 1px solid transparent;
  transition: border-color .18s var(--bh-ease), color .18s var(--bh-ease);
}

.bh-breadcrumb a:hover {
  color: var(--bh-green-deep);
  border-bottom-color: var(--bh-orange);
}

.bh-breadcrumb__sep {
  color: var(--bh-line);
}

.bh-breadcrumb [aria-current="page"] {
  color: var(--bh-ink);
}

/* ---------- 正文 ---------- */
.bh-prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.9;
  color: var(--bh-ink);
}

.bh-prose > * + * { margin-top: 1em; }

.bh-prose h2 {
  margin-top: 2em;
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 900;
  line-height: 1.3;
}

.bh-prose h3 {
  margin-top: 1.7em;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 800;
  line-height: 1.4;
}

.bh-prose ul,
.bh-prose ol {
  display: grid;
  gap: .5em;
  padding-left: 1.3em;
  list-style: disc;
}

.bh-prose ol { list-style: decimal; }

.bh-prose a {
  color: var(--bh-blue);
  border-bottom: 1px solid rgba(29, 95, 168, .4);
}

.bh-prose a:hover {
  border-bottom-color: var(--bh-orange);
}

.bh-prose strong {
  font-weight: 800;
  color: var(--bh-green-deep);
}

/* ---------- 眉题与标签 ---------- */
.bh-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--bh-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--bh-green);
}

.bh-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid rgba(29, 95, 168, .24);
  background-color: var(--bh-blue-pale);
  color: var(--bh-blue);
  font-family: var(--bh-mono);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.6;
}

.bh-tag--blue {
  background-color: var(--bh-blue-pale);
  border-color: rgba(29, 95, 168, .24);
  color: var(--bh-blue);
}

.bh-tag--orange {
  background-color: rgba(242, 107, 33, .14);
  border-color: rgba(242, 107, 33, .34);
  color: var(--bh-orange-deep);
}

/* ---------- 面板 ---------- */
.bh-panel {
  background-color: var(--bh-cream);
  border: 1px solid var(--bh-line);
  padding: clamp(16px, 2.4vw, 28px);
}

.bh-panel__title {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .08em;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--bh-line);
}

/* ---------- 图片容器基础 ---------- */
.bh-media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--bh-green-deep);
  border: 1px solid var(--bh-line);
}

.bh-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bh-media--wide { aspect-ratio: 21 / 9; }
.bh-media--square { aspect-ratio: 1 / 1; }
.bh-media--tall { aspect-ratio: 3 / 4; }

.bh-media--skew {
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
}

.bh-media--field::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, transparent calc(50% - .5px), rgba(255, 252, 244, .28) 50%, transparent calc(50% + .5px)),
    radial-gradient(circle at 50% 50%, transparent 0 58px, rgba(255, 252, 244, .28) 58px 59px, transparent 60px);
}

.bh-media__caption {
  margin-top: 8px;
  font-family: var(--bh-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--bh-green);
}

/* ---------- 平板 ---------- */
@media (max-width: 1023px) {
  .bh-footer__top {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .bh-footer__summary { max-width: 46ch; }
}

/* ---------- 移动导航断点 ---------- */
@media (max-width: 959px) {
  .bh-header__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    padding-block: 10px;
  }

  .bh-header__meta { display: none; }

  .bh-brand {
    justify-self: start;
    align-items: flex-start;
    text-align: left;
    padding-left: 0;
  }

  .bh-brand__name { letter-spacing: .1em; }
  .bh-brand__sub { opacity: 1; }

  .bh-utility { display: none; }

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

  .bh-nav {
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height .32s var(--bh-ease), visibility .32s var(--bh-ease), border-color .32s var(--bh-ease);
    border-top-color: transparent;
    background-color: var(--bh-cream);
  }

  .bh-header[data-open="true"] .bh-nav {
    max-height: calc(100vh - 86px);
    overflow-y: auto;
    visibility: visible;
    border-top-color: var(--bh-line);
  }

  .bh-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 8px 16px;
  }

  .bh-nav__item + .bh-nav__item { border-top: 1px solid rgba(169, 182, 164, .5); }

  .bh-nav__link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 14px 4px;
    border-bottom: 0;
    border-left: 3px solid transparent;
    font-size: 15px;
  }

  .bh-nav__link:hover { border-left-color: var(--bh-green); border-bottom-color: transparent; }

  .bh-nav__link[aria-current="page"] {
    border-left-color: var(--bh-orange);
    border-bottom-color: transparent;
  }

  .bh-nav__num { order: 2; }

  .bh-header.is-stuck .bh-nav__link { padding-block: 14px; }
}

/* ---------- 手机 ---------- */
@media (max-width: 719px) {
  .bh-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }

  .bh-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .bh-footer__legal {
    justify-content: flex-start;
    flex-direction: column;
    align-items: flex-start;
  }

  .bh-prose { font-size: 16px; line-height: 1.85; }
}

@media (max-width: 419px) {
  .bh-footer__cols { grid-template-columns: 1fr; }
  .bh-brand__name { font-size: 21px; }
  .bh-nav-toggle__text { display: none; }
  .bh-btn { width: 100%; }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .bh-progress__bar { transition: none; }
  .bh-btn:hover { transform: none; }
}