/* ==========================================================
   博奥体育版 / BOAO SPORTS — 共享站点样式
   文件路径: /assets/site.css
   设计协议: 技术蓝图式网格 · 左右分置导航 · 连续画布结构
   ========================================================== */

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

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

body {
  margin: 0;
  font-family: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 15px;
  line-height: 1.8;
  color: #1A2530;
  background: #F0F7FF;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: #00C2FF;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

a:hover {
  color: #FF5A36;
}

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

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em;
  font-family: "Arial Black", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-weight: 900;
  line-height: 1.25;
  color: #0A1B2A;
  transform: skewX(-6deg);
}

h1 { font-size: 40px; }
h2 { font-size: 32px; }
h3 { font-size: 22px; }
h4 { font-size: 18px; }

p {
  margin: 0 0 1em;
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 2px solid #00C2FF;
  outline-offset: 3px;
}

::selection {
  background: #00C2FF;
  color: #0A1B2A;
}

:root {
  --boo-blue: #00C2FF;
  --boo-orange: #FF5A36;
  --boo-night: #0A1B2A;
  --boo-ice: #F0F7FF;
  --boo-green: #00E0A8;
  --boo-gold: #FFB020;
  --boo-ink: #1A2530;
  --boo-gray: #6B7A8D;
  --boo-line: #D0D8DE;
  --boo-danger: #E34A6A;
  --boo-font-body: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --boo-font-head: "Arial Black", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --boo-font-num: "SF Mono", "Cascadia Mono", "Roboto Mono", "JetBrains Mono", Consolas, monospace;
  --boo-header-h: 64px;
  --boo-topbar-h: 36px;
  --boo-content-w: 1200px;
  --boo-gap: 24px;
}

/* ---------- 2. Container ---------- */
.boo-container {
  width: 100%;
  max-width: var(--boo-content-w);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ---------- 3. Skip Link ---------- */
.boo-skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 200;
  display: inline-block;
  padding: 8px 16px;
  background: var(--boo-orange);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 14px;
  line-height: 1.6;
  transition: top 0.2s ease;
}

.boo-skip-link:focus {
  top: 8px;
}

/* ---------- 4. Topbar ---------- */
.boo-topbar {
  background: var(--boo-night);
  border-bottom: 2px solid var(--boo-blue);
  position: relative;
  z-index: 95;
}

.boo-topbar__inner {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  min-height: var(--boo-topbar-h);
}

.boo-topbar__label {
  margin-right: auto;
  font-family: var(--boo-font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: rgba(240, 247, 255, 0.55);
  text-transform: uppercase;
  white-space: nowrap;
}

.boo-topbar__link {
  display: block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--boo-ice);
  background: rgba(0, 194, 255, 0.08);
  border-left: 2px solid var(--boo-orange);
  line-height: 1.6;
  transition: background 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}

.boo-topbar__link:hover {
  color: var(--boo-night);
  background: var(--boo-blue);
}

/* ---------- 5. Header ---------- */
.boo-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--boo-ice);
  border-bottom: 1px solid var(--boo-line);
  box-shadow: 0 4px 16px rgba(10, 27, 42, 0.08);
}

.boo-header__inner {
  display: flex;
  align-items: center;
  min-height: var(--boo-header-h);
  gap: 16px;
}

/* Brand */
.boo-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--boo-ink);
  transition: opacity 0.2s ease;
}

.boo-brand:hover {
  color: var(--boo-blue);
}

.boo-brand__mark {
  display: inline-block;
  font-family: var(--boo-font-num);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 0.06em;
  padding: 3px 8px 2px;
  background: var(--boo-blue);
  color: var(--boo-night);
  transform: skewX(-6deg);
  line-height: 1.3;
}

.boo-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.boo-brand__name {
  font-family: var(--boo-font-head);
  font-weight: 900;
  font-size: 19px;
  color: var(--boo-ink);
  letter-spacing: 0.04em;
}

.boo-brand__tag {
  font-family: var(--boo-font-num);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--boo-gray);
  text-transform: uppercase;
  margin-top: 2px;
}

/* Nav */
.boo-nav {
  margin-left: auto;
}

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

.boo-nav__item {
  position: relative;
}

.boo-nav__item a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--boo-ink);
  transition: color 0.2s ease;
}

.boo-nav__item a::after {
  content: "";
  display: block;
  height: 2px;
  background: var(--boo-orange);
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.boo-nav__item a:hover {
  color: var(--boo-blue);
}

.boo-nav__item a:hover::after,
.boo-nav__item a[aria-current="page"]::after {
  transform: scaleX(1);
}

.boo-nav__item a[aria-current="page"] {
  color: var(--boo-blue);
}

/* Nav Toggle */
.boo-nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  min-width: 44px;
  min-height: 44px;
  padding: 8px;
  margin-left: auto;
  background: none;
  border: none;
}

.boo-nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--boo-night);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.boo-nav-toggle__label {
  font-size: 10px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--boo-night);
  letter-spacing: 0.1em;
  margin-top: 2px;
}

.boo-nav-toggle[aria-expanded="true"] .boo-nav-toggle__bar:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.boo-nav-toggle[aria-expanded="true"] .boo-nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.boo-nav-toggle[aria-expanded="true"] .boo-nav-toggle__bar:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* Progress Bar */
.boo-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--boo-blue), var(--boo-orange));
  border-radius: 0 2px 2px 0;
  z-index: 6;
}

/* ---------- 6. Mobile Header ---------- */
@media (max-width: 920px) {
  .boo-header {
    box-shadow: none;
  }

  .boo-nav-toggle {
    display: flex;
  }

  .boo-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    background: var(--boo-ice);
    border-top: 2px solid var(--boo-blue);
    border-bottom: 1px solid var(--boo-line);
    box-shadow: 0 16px 32px rgba(10, 27, 42, 0.14);
  }

  .boo-nav[data-open] {
    display: block;
  }

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

  .boo-nav__item a {
    padding: 12px 20px;
    border-left: 3px solid transparent;
  }

  .boo-nav__item a::after {
    display: none;
  }

  .boo-nav__item a:hover {
    background: rgba(0, 194, 255, 0.08);
  }

  .boo-nav__item a[aria-current="page"] {
    border-left-color: var(--boo-orange);
    background: rgba(0, 194, 255, 0.08);
  }
}

@media (max-width: 600px) {
  .boo-topbar__label {
    display: none;
  }

  .boo-topbar__inner {
    justify-content: center;
    gap: 2px;
  }

  .boo-topbar__link {
    padding: 4px 8px;
    font-size: 11px;
  }

  .boo-brand__mark {
    font-size: 15px;
    padding: 2px 6px;
  }

  .boo-brand__name {
    font-size: 16px;
  }

  .boo-brand__tag {
    font-size: 9px;
    letter-spacing: 0.16em;
  }

  .boo-header__inner {
    min-height: 56px;
    gap: 8px;
  }
}

/* ---------- 7. Footer ---------- */
.boo-footer {
  background: var(--boo-night);
  color: rgba(240, 247, 255, 0.72);
  border-top: 4px solid var(--boo-blue);
  background-image:
    linear-gradient(rgba(0, 194, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 194, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  padding: 56px 0 0;
}

.boo-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(0, 194, 255, 0.2);
}

/* Footer Brand Block */
.boo-footer__brand .boo-footer__logo {
  display: inline-block;
  font-family: var(--boo-font-head);
  font-weight: 900;
  font-size: 24px;
  color: var(--boo-ice);
  letter-spacing: 0.06em;
  transform: skewX(-6deg);
  line-height: 1.3;
}

.boo-footer__brand .boo-footer__slogan {
  display: block;
  font-family: var(--boo-font-num);
  font-size: 12px;
  font-weight: 700;
  color: var(--boo-blue);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-top: 4px;
}

.boo-footer__desc {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(240, 247, 255, 0.6);
  max-width: 280px;
  border-left: 3px solid var(--boo-orange);
  padding-left: 12px;
}

/* Footer Titles */
.boo-footer__title {
  font-family: var(--boo-font-head);
  font-weight: 900;
  font-size: 16px;
  color: var(--boo-ice);
  margin-bottom: 16px;
  padding-bottom: 6px;
  position: relative;
}

.boo-footer__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 2px;
  background: var(--boo-blue);
}

/* Footer Links */
.boo-footer__list li {
  margin-bottom: 8px;
}

.boo-footer__list a {
  color: rgba(240, 247, 255, 0.72);
  font-size: 14px;
  position: relative;
  padding-left: 14px;
  transition: color 0.2s ease;
}

.boo-footer__list a::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--boo-orange);
  font-family: var(--boo-font-num);
}

.boo-footer__list a:hover {
  color: var(--boo-blue);
}

/* Footer Contact */
.boo-footer__item {
  font-size: 14px;
  color: rgba(240, 247, 255, 0.72);
  margin-bottom: 8px;
  line-height: 1.6;
}

.boo-footer__note {
  font-family: var(--boo-font-num);
  font-size: 12px;
  color: var(--boo-green);
  margin-top: 12px;
  padding: 6px 10px;
  background: rgba(0, 224, 168, 0.08);
  border-left: 2px solid var(--boo-green);
  display: inline-block;
}

/* Footer Meta */
.boo-footer__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 16px 0 20px;
  font-size: 13px;
  color: rgba(240, 247, 255, 0.45);
}

.boo-footer__meta-slogan {
  font-family: var(--boo-font-num);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: rgba(240, 247, 255, 0.3);
  text-transform: uppercase;
}

@media (max-width: 768px) {
  .boo-footer {
    padding: 40px 0 0;
  }

  .boo-footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-bottom: 32px;
  }

  .boo-footer__meta {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- 8. Common Buttons ---------- */
.boo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 24px;
  font-family: var(--boo-font-head);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.04em;
  border: 2px solid var(--boo-night);
  border-radius: 0;
  color: var(--boo-night);
  background: transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  text-decoration: none;
  cursor: pointer;
}

.boo-btn:hover {
  color: var(--boo-ice);
  background: var(--boo-night);
}

.boo-btn--primary {
  background: var(--boo-orange);
  border-color: var(--boo-orange);
  color: #FFFFFF;
}

.boo-btn--primary:hover {
  background: var(--boo-night);
  border-color: var(--boo-night);
  color: var(--boo-ice);
}

.boo-btn--ghost {
  border-color: var(--boo-blue);
  color: var(--boo-blue);
}

.boo-btn--ghost:hover {
  background: var(--boo-blue);
  border-color: var(--boo-blue);
  color: var(--boo-night);
}

/* ---------- 9. Breadcrumb ---------- */
.boo-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 12px;
  font-size: 13px;
  padding: 12px 0;
  color: var(--boo-gray);
}

.boo-breadcrumb li {
  display: flex;
  align-items: center;
}

.boo-breadcrumb li + li::before {
  content: "/";
  margin-right: 12px;
  color: var(--boo-line);
  font-family: var(--boo-font-num);
  font-weight: 700;
}

.boo-breadcrumb a {
  color: var(--boo-gray);
  font-weight: 500;
  transition: color 0.2s ease;
}

.boo-breadcrumb a:hover {
  color: var(--boo-blue);
}

.boo-breadcrumb li[aria-current="page"] {
  color: var(--boo-ink);
  font-weight: 700;
}

/* ---------- 10. Media (Image Container Base) ---------- */
.boo-media {
  position: relative;
  overflow: hidden;
  background: var(--boo-night);
  background-image:
    linear-gradient(rgba(0, 194, 255, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 194, 255, 0.1) 1px, transparent 1px);
  background-size: 16px 16px;
}

.boo-media::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.boo-media > img,
.boo-media > picture > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.boo-media--4x3::before { padding-top: 75%; }
.boo-media--1x1::before { padding-top: 100%; }
.boo-media--21x9::before { padding-top: 42.86%; }

/* ---------- 11. Tag ---------- */
.boo-tag {
  display: inline-block;
  font-family: var(--boo-font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  background: rgba(0, 194, 255, 0.1);
  border-left: 3px solid var(--boo-blue);
  color: var(--boo-ink);
  text-transform: uppercase;
  line-height: 1.6;
}

/* ---------- 12. Section ---------- */
.boo-section {
  padding: 56px 0;
}

.boo-section--dark {
  background: var(--boo-night);
  color: var(--boo-ice);
}

.boo-section--dark .boo-section__title {
  color: var(--boo-ice);
}

.boo-section--dark .boo-section__lead {
  color: rgba(240, 247, 255, 0.6);
}

.boo-section__title {
  font-size: 32px;
  margin-bottom: 0.25em;
}

.boo-section__lead {
  font-size: 16px;
  color: var(--boo-gray);
  max-width: 640px;
  margin-bottom: 32px;
}

@media (max-width: 600px) {
  .boo-section {
    padding: 32px 0;
  }
}

/* ---------- 13. Grid ---------- */
.boo-grid {
  display: grid;
  gap: var(--boo-gap);
}

.boo-grid--2 { grid-template-columns: repeat(2, 1fr); }
.boo-grid--3 { grid-template-columns: repeat(3, 1fr); }
.boo-grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 920px) {
  .boo-grid--3,
  .boo-grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .boo-grid--2,
  .boo-grid--3,
  .boo-grid--4 { grid-template-columns: 1fr; }
}

/* ---------- 14. Callout ---------- */
.boo-callout {
  position: relative;
  padding: 16px 20px 16px 44px;
  background: rgba(0, 194, 255, 0.08);
  border-left: 4px solid var(--boo-blue);
  font-size: 14px;
  line-height: 1.7;
  color: var(--boo-ink);
  margin-bottom: 24px;
}

.boo-callout::before {
  content: "!";
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--boo-blue);
  color: #FFFFFF;
  font-family: var(--boo-font-num);
  font-weight: 800;
  font-size: 13px;
  text-align: center;
  line-height: 20px;
}

.boo-callout[data-type="warn"] {
  background: rgba(255, 90, 54, 0.08);
  border-left-color: var(--boo-orange);
}

.boo-callout[data-type="warn"]::before {
  background: var(--boo-orange);
  content: "!";
}

.boo-callout[data-type="info"] {
  background: rgba(0, 224, 168, 0.08);
  border-left-color: var(--boo-green);
}

.boo-callout[data-type="info"]::before {
  background: var(--boo-green);
  content: "i";
}

/* ---------- 15. Main Scaffold ---------- */
.boo-main {
  min-height: 70vh;
}

/* ---------- 16. Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}