/* ==========================================================================
   B体育官方CN站 — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ========================================================================== */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption, blockquote, dl, dd {
  margin: 0;
}

ul, ol { padding: 0; }

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

a { color: inherit; }

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

table { border-collapse: collapse; }

:focus-visible {
  outline: 2px solid #2BE8C8;
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   2. 变量
   -------------------------------------------------------------------------- */
:root {
  /* 色彩 */
  --ink:        #0A1A2F;
  --deep:       #06302B;
  --violet:     #241B3F;
  --wine:       #5A1630;
  --cyan:       #2BE8C8;
  --orange:     #FF7A3C;
  --bone:       #F3F0E7;
  --slate:      #8794A8;
  --mist:       #C9D6D2;
  --carbon:     #12161C;

  /* 结构与边界 */
  --line:       rgba(135, 148, 168, 0.22);
  --line-soft:  rgba(135, 148, 168, 0.12);
  --line-light: rgba(201, 214, 210, 0.16);

  /* 字体 */
  --font-head: "Oswald", "Archivo Narrow", "Arial Narrow", "Source Han Sans SC",
               "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular,
               Menlo, Consolas, monospace;

  /* 尺寸 */
  --rail-w:  236px;
  --strip-h: 34px;
  --bar-h:   52px;
  --shell-w: 1180px;
}

/* --------------------------------------------------------------------------
   3. 页面基底
   -------------------------------------------------------------------------- */
body {
  min-height: 100vh;
  padding-top: calc(var(--strip-h) + var(--bar-h));
  margin: 0;
  background-color: var(--ink);
  color: var(--bone);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

/* 精密网格底纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(135, 148, 168, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(135, 148, 168, 0.05) 1px, transparent 1px);
  background-size: 72px 72px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--bone);
}

h1 { font-size: clamp(34px, 6vw, 64px); }
h2 { font-size: clamp(26px, 4vw, 40px); }
h3 { font-size: clamp(20px, 2.4vw, 28px); }
h4 { font-size: 19px; }

p { line-height: 1.85; }

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

/* --------------------------------------------------------------------------
   4. 跳转链接
   -------------------------------------------------------------------------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: -9999px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.skip-link:focus {
  left: 8px;
}

/* --------------------------------------------------------------------------
   5. 顶部比分坐标条
   -------------------------------------------------------------------------- */
.score-strip {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 70;
  display: flex;
  align-items: center;
  gap: 12px;
  height: var(--strip-h);
  padding: 0 12px;
  background: var(--carbon);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.1em;
  color: var(--mist);
  white-space: nowrap;
  overflow: hidden;
}

.score-strip__label {
  color: var(--cyan);
  flex: none;
}

.score-strip__score {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  flex: none;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.score-strip__score i {
  font-style: normal;
  font-weight: 400;
  color: var(--slate);
}

.score-strip__meta {
  color: var(--slate);
  overflow: hidden;
  text-overflow: ellipsis;
}

.score-strip__chapter {
  margin-left: auto;
  flex: none;
  color: var(--mist);
}

@media (max-width: 639px) {
  .score-strip__meta { display: none; }
}

/* --------------------------------------------------------------------------
   6. 轨道栏（移动端 = 顶部细条）
   -------------------------------------------------------------------------- */
.rail {
  position: fixed;
  top: var(--strip-h);
  left: 0;
  right: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  gap: 12px;
  height: var(--bar-h);
  padding: 0 14px;
  background: var(--carbon);
  border-bottom: 1px solid var(--line);
}

.rail__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  text-decoration: none;
  color: var(--bone);
}

.rail__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 26px;
  height: 26px;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0;
}

.rail__name {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.rail__line { display: none; }

/* 抽屉开关 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--mist);
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.nav-toggle:hover {
  color: var(--bone);
  border-color: var(--cyan);
  background: rgba(43, 232, 200, 0.07);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  flex: none;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: background-color 0.2s ease;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform 0.2s ease;
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after  { top: 5px; }

.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after  { transform: translateY(-5px) rotate(-45deg); }

/* 抽屉内容：移动端 */
.rail__drawer { display: none; }

/* 导航列表（两种视口共用样式） */
.rail-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: railnav;
}

.rail-nav__item {
  counter-increment: railnav;
  border-top: 1px solid var(--line-soft);
}

.rail-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 8px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.3;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.rail-nav__link::before {
  content: counter(railnav, decimal-leading-zero);
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--slate);
  transition: color 0.18s ease;
}

.rail-nav__tick {
  flex: none;
  margin-left: auto;
  width: 8px;
  height: 1px;
  background: var(--line);
  transition: width 0.18s ease, background-color 0.18s ease;
}

.rail-nav__link:hover {
  color: var(--bone);
  background: rgba(43, 232, 200, 0.06);
}

.rail-nav__link:hover::before { color: var(--cyan); }
.rail-nav__link:hover .rail-nav__tick { width: 20px; background: var(--cyan); }

.rail-nav__link[aria-current="page"],
.rail-nav__link[data-active] {
  color: var(--cyan);
  background: rgba(43, 232, 200, 0.09);
  border-left-color: var(--orange);
}

.rail-nav__link[aria-current="page"]::before,
.rail-nav__link[data-active]::before { color: var(--orange); }

.rail-nav__link[aria-current="page"] .rail-nav__tick,
.rail-nav__link[data-active] .rail-nav__tick { width: 20px; background: var(--cyan); }

/* 行动按钮组 */
.rail__actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* 移动端抽屉展开 */
@media (max-width: 1023px) {
  .rail { overflow: visible; }

  .site-header[data-open] .rail__drawer {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--strip-h) - var(--bar-h));
    overflow-y: auto;
    padding: 8px 14px 20px;
    background: var(--ink);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 28px 44px rgba(0, 0, 0, 0.5);
  }

  .site-header[data-open] .rail__actions {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--line-soft);
  }
}

/* --------------------------------------------------------------------------
   7. 按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 16px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.2;
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease,
              border-color 0.2s ease, transform 0.2s ease;
}

.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  font-weight: 700;
}

.btn--primary:hover {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(135, 148, 168, 0.45);
  color: var(--mist);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--bone);
  background: rgba(43, 232, 200, 0.08);
}

/* --------------------------------------------------------------------------
   8. 页脚
   -------------------------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: 96px;
  background: var(--violet);
  border-top: 1px solid var(--line);
  color: var(--mist);
}

.footer-axis {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line-light);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(201, 214, 210, 0.5);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 48px 20px 36px;
}

/* 品牌区 */
.footer-brand__mark {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: var(--bone);
}

.footer-brand__line {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.footer-brand__note {
  margin-top: 14px;
  max-width: 22em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

/* 栏目 */
.footer-col__title {
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line-light);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.12em;
  color: var(--slate);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 9px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col a {
  font-size: 15px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s ease, padding-left 0.18s ease;
}

.footer-col a:hover {
  color: var(--cyan);
  padding-left: 6px;
}

/* 联系信息 */
.footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.footer-contact__k {
  display: inline-block;
  min-width: 3.6em;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.footer-contact__note {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--slate);
}

/* 底部条 */
.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 18px;
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 18px 20px 30px;
  border-top: 1px solid var(--line-light);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.footer-base__icp { color: var(--slate); }
.footer-base__copy { color: rgba(201, 214, 210, 0.65); }

/* --------------------------------------------------------------------------
   9. 通用基础组件（页面阶段复用）
   -------------------------------------------------------------------------- */
.container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--shell-w);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  position: relative;
  z-index: 1;
  padding: 72px 0;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 20px;
  padding-bottom: 16px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.section-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.lede {
  max-width: 36em;
  font-size: 18px;
  line-height: 1.85;
  color: var(--mist);
}

.rule {
  height: 1px;
  margin: 32px 0;
  border: 0;
  background: var(--line);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 20px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.breadcrumb a {
  color: var(--slate);
  text-decoration: none;
  transition: color 0.18s ease;
}

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

.breadcrumb__sep { color: rgba(135, 148, 168, 0.5); }

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

.panel {
  position: relative;
  padding: 22px;
  background: rgba(18, 22, 28, 0.6);
  border: 1px solid var(--line);
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.panel:hover,
.panel:focus-within {
  transform: translateY(-2px);
  border-color: rgba(43, 232, 200, 0.55);
  background: rgba(18, 22, 28, 0.86);
}

.panel__title {
  margin-bottom: 10px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat__value {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--slate);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.badge,
.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.6;
}

.badge {
  color: var(--cyan);
  border: 1px solid rgba(43, 232, 200, 0.45);
}

.tag {
  background: var(--wine);
  border: 1px solid transparent;
  color: var(--bone);
}

.link-underline {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 232, 200, 0.4);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.link-underline:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* 图片容器基底 */
.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(160deg, var(--deep), var(--carbon));
  border: 1px solid var(--line);
}

.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--3x2 { aspect-ratio: 3 / 2; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.08) brightness(0.82) saturate(0.92);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(243, 240, 231, 0.07) 1px, transparent 1px);
  background-size: 3px 3px;
  mix-blend-mode: overlay;
}

/* --------------------------------------------------------------------------
   10. 平板
   -------------------------------------------------------------------------- */
@media (min-width: 700px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 36px 32px;
    padding: 56px 32px 40px;
  }
}

@media (min-width: 768px) {
  .grid { gap: 24px; }
}

/* --------------------------------------------------------------------------
   11. 桌面：侧边轨道
   -------------------------------------------------------------------------- */
@media (min-width: 1024px) {
  body {
    padding-top: var(--strip-h);
    padding-left: var(--rail-w);
  }

  .score-strip { left: var(--rail-w); }

  .rail {
    top: 0;
    left: 0;
    right: auto;
    bottom: 0;
    width: var(--rail-w);
    height: auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 28px 22px 26px;
    background: var(--carbon);
    border-right: 1px solid var(--line);
    border-bottom: 0;
    overflow-y: auto;
  }

  .rail__brand {
    display: block;
    flex: none;
  }

  .rail__mark {
    width: 40px;
    height: 40px;
    margin-bottom: 16px;
    font-size: 22px;
  }

  .rail__name {
    display: block;
    font-size: 20px;
  }

  .rail__line {
    display: block;
    margin-top: 7px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--slate);
  }

  .nav-toggle { display: none; }

  .rail__drawer {
    display: flex;
    flex-direction: column;
    flex: 1 1 auto;
    min-height: 0;
    margin-top: 28px;
  }

  .rail-nav__link { padding: 13px 8px; }

  .rail__actions {
    margin-top: auto;
    padding-top: 24px;
  }

  .container { padding: 0 40px; }

  .section { padding: 104px 0; }

  .footer-axis { padding: 12px 40px; }

  .footer-grid {
    grid-template-columns: 1.35fr 1fr 1fr 1fr 1.5fr;
    gap: 34px;
    padding: 64px 40px 44px;
  }

  .footer-base { padding: 18px 40px 32px; }
}

/* --------------------------------------------------------------------------
   12. 减少动效
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

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