/* ============================================================
   8体育赛场 · 共享外壳样式表 /assets/site.css
   夜间赛场指挥中心 · 蓝图网格 · 直角 · 等宽索引
   ============================================================ */

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

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

ul, ol { list-style: none; }

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

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; }

table { border-collapse: collapse; border-spacing: 0; }

/* ---------- 2. Tokens ---------- */
:root {
  --navy-900: #06131F;
  --navy-800: #0C2233;
  --navy-700: #102B40;
  --cyan: #17E0C8;
  --lime: #7CFF4D;
  --orange: #FF8A3D;
  --purple: #8A6BFF;
  --grid: #1E3A50;
  --text: #D7E3EC;
  --muted: #8AA0B4;
  --white: #FFFFFF;

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

  --header-h: 78px;
  --track: 1440px;
  --pad-x: clamp(20px, 4vw, 56px);
  --rule: 1px solid var(--grid);

  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur-nav: 240ms;
}

@media (max-width: 960px) {
  :root { --header-h: 68px; }
}

/* ---------- 3. Base & 中文排版 ---------- */
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background-color: var(--navy-900);
  color: var(--text);
  font-family: var(--font-cn);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 固定蓝图网格底纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(30, 58, 80, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 58, 80, 0.55) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.45;
}

h1, h2, h3, h4 {
  font-family: var(--font-cn);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--white);
}

h1 { font-size: clamp(34px, 5.4vw, 56px); }
h2 { font-size: clamp(28px, 3.6vw, 44px); }
h3 { font-size: clamp(20px, 2.2vw, 26px); }

p { max-width: 68ch; }

strong { font-weight: 700; color: var(--white); }

code, kbd, samp, time, .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

::selection {
  background: var(--cyan);
  color: var(--navy-900);
}

/* 焦点可见 */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 0;
}

/* ---------- 4. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--track);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.section {
  padding-block: clamp(56px, 8vw, 120px);
}

.section-head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(28px, 4vw, 56px);
  border-top: var(--rule);
  padding-top: 22px;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section-title {
  margin: 0;
  max-width: 24em;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: start;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 32px);
}

.grid-12 > * { grid-column: span var(--span, 12); }

/* ---------- 5. 正文容器 ---------- */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text);
}

.prose p { margin-bottom: 1.15em; }
.prose p:last-child { margin-bottom: 0; }

.prose h3 {
  margin: 2em 0 0.7em;
  font-size: 21px;
  font-weight: 700;
  color: var(--white);
}

.prose ul,
.prose ol {
  margin-bottom: 1.2em;
  padding-left: 1.15em;
  list-style: none;
}

.prose li {
  position: relative;
  margin-bottom: 0.55em;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: -1.05em;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.prose ol { counter-reset: p; }
.prose ol li::before {
  counter-increment: p;
  content: counter(p, decimal-leading-zero);
  position: absolute;
  left: -1.9em;
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.prose blockquote {
  border-left: 2px solid var(--cyan);
  padding-left: 20px;
  margin: 1.6em 0;
  color: var(--muted);
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border: 1px solid var(--cyan);
  background: transparent;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  border-radius: 0;
  transition: background-color 180ms var(--ease-out),
              color 180ms var(--ease-out),
              border-color 180ms var(--ease-out);
}

.btn:hover,
.btn:focus-visible {
  background-color: var(--cyan);
  color: var(--navy-900);
}

.btn--ghost {
  border-color: var(--grid);
  color: var(--muted);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--text);
  background-color: transparent;
  color: var(--white);
}

.btn--lime {
  border-color: var(--lime);
  color: var(--lime);
}
.btn--lime:hover,
.btn--lime:focus-visible {
  background-color: var(--lime);
  color: var(--navy-900);
}

.btn--block {
  width: 100%;
}

/* ---------- 7. 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
}

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

.breadcrumb li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--grid);
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 160ms var(--ease-out);
}

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

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

/* ---------- 8. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: var(--rule);
  border-radius: 0;
  background-color: var(--navy-800);
  background-image: linear-gradient(135deg, rgba(23, 224, 200, 0.08), rgba(138, 107, 255, 0.06));
}

.media-frame > img,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(30, 58, 80, 0.7) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 58, 80, 0.7) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.35;
}

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

/* ---------- 9. 状态标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  border: 1px solid var(--grid);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1.4;
  white-space: nowrap;
}

.tag--live { border-color: var(--lime); color: var(--lime); }
.tag--live::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--lime);
}

.tag--info { border-color: var(--cyan); color: var(--cyan); }
.tag--alert { border-color: var(--orange); color: var(--orange); }
.tag--viz { border-color: var(--purple); color: var(--purple); }

/* ---------- 10. 横向溢出容器 ---------- */
.scroll-x {
  width: 100%;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--grid) transparent;
}

.scroll-x::-webkit-scrollbar { height: 8px; }
.scroll-x::-webkit-scrollbar-track { background: transparent; }
.scroll-x::-webkit-scrollbar-thumb {
  background: var(--grid);
  border-radius: 0;
}

/* ---------- 11. Skip link ---------- */
.skip-link {
  position: absolute;
  left: var(--pad-x);
  top: -80px;
  z-index: 999;
  padding: 11px 18px;
  background: var(--cyan);
  color: var(--navy-900);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-decoration: none;
  border-radius: 0;
  transition: top 180ms var(--ease-out);
}

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

/* ---------- 12. Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur-nav) linear,
              border-color var(--dur-nav) linear;
}

.site-header[data-scrolled="true"],
.site-header[data-nav-open="true"] {
  background-color: var(--navy-900);
  border-bottom-color: var(--grid);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: var(--track);
  margin-inline: auto;
  padding: 14px var(--pad-x);
  min-height: var(--header-h);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex: 0 0 auto;
}

.brand-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  padding: 0 8px;
  border: 1px solid var(--grid);
  background: var(--navy-800);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: border-color 180ms var(--ease-out),
              background-color 180ms var(--ease-out);
}

.brand:hover .brand-idx,
.brand:focus-visible .brand-idx {
  border-color: var(--cyan);
  background: var(--navy-700);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.2;
}

.brand-name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--grid);
  background: transparent;
  color: var(--text);
  border-radius: 0;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  transition: border-color 180ms var(--ease-out), color 180ms var(--ease-out);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle-bars > span {
  display: block;
  height: 1px;
  width: 100%;
  background: currentColor;
  transition: transform 200ms var(--ease-out), opacity 200ms var(--ease-out);
}

.site-nav[data-open] ~ .nav-toggle .nav-toggle-bars > span:nth-child(1),
.nav-toggle[aria-expanded="true"] .nav-toggle-bars > span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars > span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars > span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.nav-toggle-label { white-space: nowrap; }

/* 导航（桌面） */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.4vw, 36px);
  flex: 1 1 auto;
  justify-content: flex-end;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.6vw, 24px);
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 2px;
  border-bottom: 1px solid transparent;
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color 180ms var(--ease-out), border-color 180ms var(--ease-out);
}

.nav-link:hover { color: var(--text); }

.nav-link[aria-current="page"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.nav-idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--grid);
  transition: color 180ms var(--ease-out);
}

.nav-link:hover .nav-idx { color: var(--muted); }
.nav-link[aria-current="page"] .nav-idx { color: var(--cyan); }

.btn--nav {
  flex: 0 0 auto;
  padding: 10px 18px;
  font-size: 12px;
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(30, 58, 80, 0.5);
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--cyan);
}

/* ---------- 13. 导航移动态 ---------- */
@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
    position: relative;
    z-index: 140;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    left: auto;
    width: min(360px, 88vw);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 26px 26px 40px;
    background-color: var(--navy-800);
    border-left: var(--rule);
    overflow-y: auto;
    z-index: 120;
    transform: translateX(102%);
    visibility: hidden;
    transition: transform var(--dur-nav) var(--ease-out),
                visibility 0s linear var(--dur-nav);
  }

  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
    transition: transform var(--dur-nav) var(--ease-out),
                visibility 0s linear 0s;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    border-top: var(--rule);
  }

  .nav-link {
    justify-content: flex-start;
    width: 100%;
    padding: 15px 4px;
    border-bottom: var(--rule);
    font-size: 16px;
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: var(--grid);
    box-shadow: inset 2px 0 0 var(--cyan);
    padding-left: 12px;
  }

  .nav-idx { font-size: 11px; }

  .btn--nav {
    margin-top: 26px;
    width: 100%;
    padding: 15px 18px;
    font-size: 13px;
  }
}

@media (max-width: 520px) {
  .brand-sub { display: none; }
  .nav-toggle-label { display: none; }
}

/* ---------- 14. Footer ---------- */
.site-footer {
  position: relative;
  background-color: var(--navy-800);
  border-top: var(--rule);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(23, 224, 200, 0));
}

.footer-inner {
  width: 100%;
  max-width: var(--track);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 80px) var(--pad-x) 26px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: clamp(28px, 4vw, 60px);
  align-items: start;
}

.footer-brand { display: grid; gap: 6px; }

.footer-mark {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
  max-width: none;
}

.footer-mark-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  max-width: none;
}

.footer-tagline {
  margin-top: 10px;
  padding-top: 12px;
  border-top: var(--rule);
  font-size: 13px;
  color: var(--text);
  max-width: 22ch;
}

.footer-col { display: grid; gap: 14px; }

.footer-col-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--text);
  text-transform: uppercase;
}

.footer-col-idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.footer-links {
  display: grid;
  gap: 9px;
  font-size: 14px;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease-out), border-color 160ms var(--ease-out);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.footer-links--plain li {
  color: var(--muted);
  word-break: break-word;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 32px;
  margin-top: clamp(34px, 5vw, 64px);
  padding-top: 22px;
  border-top: var(--rule);
}

.footer-legal {
  font-size: 13px;
  color: var(--muted);
  max-width: 62ch;
}

.footer-legal-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.footer-legal-nav a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease-out), border-color 160ms var(--ease-out);
}

.footer-legal-nav a:hover,
.footer-legal-nav a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1100px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
  .footer-col:last-child { grid-column: 1 / -1; }
  .footer-col:last-child .footer-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; }

  .grid-12 > * { grid-column: 1 / -1; }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand { grid-column: 1 / -1; }
  .footer-col:last-child { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-col,
  .footer-col:last-child { grid-column: auto; }
  .footer-col:last-child .footer-links { grid-template-columns: 1fr; }

  .footer-base { flex-direction: column; align-items: flex-start; }

  .prose { font-size: 16px; }
}

/* ---------- 16. 显现动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 300ms var(--ease-out), transform 300ms var(--ease-out);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 17. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}