/* =========================================================
   博鱼体育官网导航 · 共享样式 /assets/site.css
   水下信号站设计系统：深海蓝底 + 荧光青刻度 + 等宽数字
   ========================================================= */

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

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--deep-sea);
  color: var(--mist-white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --deep-sea: #0A1B33;
  --hull-blue: #12335A;
  --fluoro-cyan: #16E0D2;
  --aqua-glow: #7FF3EA;
  --coral: #FF6B4A;
  --signal-gold: #FFC24B;
  --mist-white: #EAF4F7;
  --gray-blue: #9FB6C6;
  --abyss: #061224;
  --mint-fog: #B8FFF5;

  --line-soft: rgba(127, 243, 234, 0.14);
  --line-mid: rgba(127, 243, 234, 0.28);
  --line-strong: rgba(22, 224, 210, 0.55);

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --rail-h: 64px;
  --shell-max: 1360px;
  --gutter: clamp(18px, 4vw, 44px);
  --radius: 3px;
  --radius-soft: 10px;
  --cut: -6deg;

  --shadow-lift: 0 18px 40px -22px rgba(0, 0, 0, 0.85);
  --focus-ring: 0 0 0 3px rgba(184, 255, 245, 0.9);
}

/* ---------- 3. 基础排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(34px, 6.4vw, 88px); }
h2 { font-size: clamp(26px, 3.6vw, 56px); }
h3 { font-size: clamp(20px, 2.2vw, 30px); }

strong { font-weight: 700; color: var(--aqua-glow); }
small { font-size: 13px; color: var(--gray-blue); }

a:hover { color: var(--aqua-glow); }

.mono,
time,
[data-num] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ---------- 4. 焦点与可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--mint-fog);
  outline-offset: 3px;
  border-radius: 2px;
}

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 400;
  padding: 10px 18px;
  background: var(--mint-fog);
  color: var(--abyss);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: 2px;
  transform: translateY(-180%);
  transition: transform 0.2s ease;
}
.skip-link:focus { transform: translateY(0); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. 容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.prose {
  max-width: 42ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--mist-white);
}
.prose > * + * { margin-top: 1.1em; }
.prose a {
  color: var(--aqua-glow);
  border-bottom: 1px solid var(--line-mid);
}
.prose a:hover { border-bottom-color: var(--fluoro-cyan); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-blue);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--line-strong);
}

/* ---------- 6. 顶部命令栏 ---------- */
.cmd-bar {
  position: sticky;
  top: 0;
  z-index: 120;
  height: var(--rail-h);
  background: rgba(10, 27, 51, 0.88);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid var(--line-soft);
}

.cmd-bar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -5px;
  height: 4px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(22, 224, 210, 0.4) 0 1px,
    transparent 1px 14px
  );
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  pointer-events: none;
}

.cmd-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 30px);
  height: 100%;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--fluoro-cyan), var(--signal-gold) 72%, var(--coral));
  box-shadow: 0 0 12px rgba(22, 224, 210, 0.55);
  pointer-events: none;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  min-width: 0;
}

.brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-mid);
  border-radius: 50%;
  transform: rotate(var(--cut));
  flex: 0 0 auto;
}
.brand__mark::before {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(22, 224, 210, 0.35);
  border-radius: 50%;
}
.brand__mark-dot {
  width: 7px;
  height: 7px;
  background: var(--fluoro-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(22, 224, 210, 0.9);
}

.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--mist-white);
  white-space: nowrap;
}
.brand__meta {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--gray-blue);
  line-height: 1.4;
  white-space: nowrap;
}
.brand__idx { color: var(--signal-gold); }
.brand:hover .brand__name { color: var(--aqua-glow); }

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 14px;
  border: 1px solid var(--line-mid);
  border-radius: 2px;
  color: var(--aqua-glow);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.nav-toggle__glyph {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
}
.nav-toggle__glyph i {
  display: block;
  height: 1.5px;
  width: 100%;
  background: var(--fluoro-cyan);
  transition: transform 0.22s ease, opacity 0.22s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph i:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph i:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* 导航 */
.site-nav { flex: 1 1 auto; min-width: 0; }

.site-nav__list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.site-nav__item { position: relative; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 11px;
  font-size: 13px;
  line-height: 1.2;
  color: var(--gray-blue);
  white-space: nowrap;
  transition: color 0.18s ease;
}
.site-nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 0;
  background: var(--fluoro-cyan);
  border-radius: 2px;
  transform: translateY(-50%);
  transition: height 0.2s ease;
}
.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: rgba(159, 182, 198, 0.65);
  transition: color 0.18s ease;
}
.site-nav__link:hover { color: var(--aqua-glow); }
.site-nav__link:hover .site-nav__idx { color: var(--fluoro-cyan); }

.site-nav__link[aria-current="page"] {
  color: var(--fluoro-cyan);
  font-weight: 600;
}
.site-nav__link[aria-current="page"]::before { height: 16px; }
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--signal-gold); }

/* 右侧按钮 */
.cmd-bar__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

/* ---------- 7. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 2px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: background-color 0.18s ease, color 0.18s ease,
              border-color 0.18s ease, transform 0.18s ease;
}

.btn--quiet {
  color: var(--aqua-glow);
  border-color: var(--line-mid);
  background: rgba(18, 51, 90, 0.4);
}
.btn--quiet:hover {
  color: var(--abyss);
  background: var(--aqua-glow);
  border-color: var(--aqua-glow);
  transform: translateY(-1px);
}

.btn--signal {
  color: var(--abyss);
  background: var(--fluoro-cyan);
  box-shadow: 0 10px 24px -14px rgba(22, 224, 210, 0.9);
}
.btn--signal:hover {
  background: var(--signal-gold);
  color: var(--abyss);
  transform: translateY(-1px);
}

.btn--ghost {
  color: var(--mist-white);
  border-color: var(--line-mid);
}
.btn--ghost:hover {
  border-color: var(--fluoro-cyan);
  color: var(--fluoro-cyan);
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(60px, 9vw, 130px);
  background: linear-gradient(180deg, var(--deep-sea) 0%, var(--hull-blue) 22%, var(--abyss) 100%);
  border-top: 1px solid var(--line-mid);
  color: var(--mist-white);
}

.footer-wave {
  height: 12px;
  background-image: radial-gradient(
    circle at 12px 15px,
    transparent 12px,
    rgba(22, 224, 210, 0.34) 12.5px,
    transparent 13.5px
  );
  background-size: 24px 16px;
  background-repeat: repeat-x;
  opacity: 0.85;
}

.site-footer__inner {
  padding-top: clamp(36px, 5vw, 68px);
  padding-bottom: 28px;
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(210px, 1fr) minmax(0, 2.4fr);
  gap: clamp(28px, 4vw, 72px);
  padding-bottom: clamp(28px, 4vw, 52px);
  border-bottom: 1px solid var(--line-soft);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.01em;
  line-height: 1.2;
}
.footer-brand__tag {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gray-blue);
}
.footer-brand__note {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--gray-blue);
}
.footer-brand__chip {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 7px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--fluoro-cyan);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 44px);
}

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--signal-gold);
}

.footer-col__list { display: flex; flex-direction: column; gap: 9px; }
.footer-col__list a {
  display: inline-block;
  font-size: 14px;
  color: var(--gray-blue);
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}
.footer-col__list a:hover {
  color: var(--aqua-glow);
  border-bottom-color: var(--fluoro-cyan);
}

.footer-col__list--plain li {
  font-size: 13.5px;
  color: var(--gray-blue);
  word-break: break-word;
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 22px;
  font-size: 12.5px;
  color: rgba(159, 182, 198, 0.75);
}
.site-footer__copy { font-family: var(--font-mono); letter-spacing: 0.03em; }
.site-footer__base-links { display: flex; flex-wrap: wrap; gap: 18px; }
.site-footer__base-links a { color: var(--gray-blue); }
.site-footer__base-links a:hover { color: var(--fluoro-cyan); }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb {
  padding: 22px 0 6px;
}
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--gray-blue);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 10px; }
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: rgba(127, 243, 234, 0.35);
}
.breadcrumb__item a:hover { color: var(--aqua-glow); }
.breadcrumb__item [aria-current="page"] { color: var(--fluoro-cyan); }

/* ---------- 10. 章节头 ---------- */
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
}
.section-head__title { font-size: clamp(24px, 3vw, 44px); }
.section-head__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray-blue);
  text-align: right;
}

/* ---------- 11. 网格工具 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}
.grid--split-7-5 > .grid__main { grid-column: span 7; }
.grid--split-7-5 > .grid__side { grid-column: span 5; }
.grid--split-8-4 > .grid__main { grid-column: span 8; }
.grid--split-8-4 > .grid__side { grid-column: span 4; }
.grid--split-3-9 > .grid__side { grid-column: span 3; }
.grid--split-3-9 > .grid__main { grid-column: span 9; }
.grid--split-4-8 > .grid__side { grid-column: span 4; }
.grid--split-4-8 > .grid__main { grid-column: span 8; }

/* ---------- 12. 卡片与标签 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 28px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(152deg, rgba(18, 51, 90, 0.72) 0%, rgba(6, 18, 36, 0.9) 100%);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}
.card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 42px;
  height: 2px;
  background: var(--fluoro-cyan);
  opacity: 0.55;
  transition: width 0.24s ease, opacity 0.24s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--line-mid);
  box-shadow: var(--shadow-lift);
}
.card:hover::after { width: 84px; opacity: 1; }

.card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--gray-blue);
}
.card__title {
  font-size: clamp(18px, 1.8vw, 24px);
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.card__body { margin-top: 12px; color: var(--gray-blue); font-size: 15px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line-mid);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--aqua-glow);
}
.tag--live { color: var(--coral); border-color: rgba(255, 107, 74, 0.45); }
.tag--data { color: var(--signal-gold); border-color: rgba(255, 194, 75, 0.4); }

/* ---------- 13. 分隔与波纹 ---------- */
.rule {
  height: 1px;
  background: var(--line-soft);
  border: 0;
  margin: clamp(32px, 4vw, 60px) 0;
}
.rule--wave {
  height: 12px;
  background: none;
  background-image: radial-gradient(
    circle at 10px 13px,
    transparent 10px,
    rgba(22, 224, 210, 0.22) 10.5px,
    transparent 11.5px
  );
  background-size: 20px 14px;
  background-repeat: repeat-x;
}

/* ---------- 14. 图片位基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(22, 224, 210, 0.16) 0%, transparent 55%),
    linear-gradient(155deg, var(--hull-blue) 0%, var(--abyss) 100%);
}
.media-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 42%;
  background: linear-gradient(180deg, transparent, rgba(6, 18, 36, 0.72));
  pointer-events: none;
}
.media-frame__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}
.media-frame--wide::before { padding-top: 42%; }
.media-frame--square::before { padding-top: 100%; }
.media-frame--tall::before { padding-top: 124%; }

/* ---------- 15. 显现动效协议 ---------- */
[data-js="true"] [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}
[data-js="true"] [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 16. 断点 ---------- */
@media (max-width: 1180px) {
  .site-nav__label { font-size: 12.5px; }
  .site-nav__link { padding: 10px 8px; gap: 5px; }
  .brand__meta { display: none; }
}

@media (max-width: 1080px) {
  :root { --rail-h: 60px; }

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

  .site-nav {
    position: fixed;
    top: var(--rail-h);
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--rail-h));
    overflow-y: auto;
    padding: 14px var(--gutter) 32px;
    background: linear-gradient(180deg, rgba(6, 18, 36, 0.985) 0%, rgba(10, 27, 51, 0.985) 100%);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line-mid);
    border-top: 1px solid var(--line-soft);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    justify-content: flex-start;
  }
  .site-nav__link {
    width: 100%;
    padding: 15px 10px;
    font-size: 15px;
    border-bottom: 1px solid var(--line-soft);
  }
  .site-nav__link::before { left: -2px; }
  .site-nav__link[aria-current="page"]::before { height: 22px; }

  .cmd-bar__actions { display: none; }

  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 34px;
  }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .grid { gap: 18px; }
  .grid--split-7-5 > .grid__main,
  .grid--split-7-5 > .grid__side,
  .grid--split-8-4 > .grid__main,
  .grid--split-8-4 > .grid__side,
  .grid--split-3-9 > .grid__main,
  .grid--split-3-9 > .grid__side,
  .grid--split-4-8 > .grid__main,
  .grid--split-4-8 > .grid__side { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .brand__name { font-size: 14px; }
  .brand__mark { width: 26px; height: 26px; }
  .nav-toggle__label { display: none; }

  .footer-cols { grid-template-columns: 1fr; gap: 26px; }
  .site-footer__base { flex-direction: column; align-items: flex-start; }

  .section-head {
    grid-template-columns: 1fr;
    align-items: start;
  }
  .section-head__note { text-align: left; }

  .prose { max-width: 100%; font-size: 16px; }
}

/* ---------- 17. 降低动态效果 ---------- */
@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;
  }
  [data-js="true"] [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .card:hover { transform: none; }
  .btn:hover { transform: none; }
}