/* ==========================================================================
   6T体育主站 · 共享样式 /assets/site.css
   深墨绿底 · 炭黑面板 · 柠檬绿强调 · 框式导航 · 数据轨道
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #06140F;
  --panel: #101413;
  --panel-deep: #0A1210;
  --glass: rgba(198, 241, 53, 0.06);
  --glass-line: rgba(255, 255, 255, 0.14);
  --line: #26302B;
  --accent: #C8F13C;
  --accent-soft: rgba(200, 241, 60, 0.18);
  --accent-2: #FF7A29;
  --cold: #2E7DFF;
  --hot: #FF4A5A;
  --gold-a: #F6D26B;
  --gold-b: #B07C2A;
  --text: #B6C0BA;
  --text-dim: rgba(182, 192, 186, 0.6);
  --text-faint: rgba(182, 192, 186, 0.35);
  --head: #F2F6F3;

  --header-h: 64px;
  --rail-w: 88px;
  --maxw: 1440px;
  --gap: 24px;
  --radius: 3px;

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

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  padding-top: var(--header-h);
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 560px at 82% -8%, rgba(200, 241, 60, 0.10), transparent 62%),
    radial-gradient(900px 520px at -6% 14%, rgba(46, 125, 255, 0.09), transparent 66%);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main { margin-left: var(--rail-w); }

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  color: var(--head);
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

h1 { font-size: clamp(28px, 4.4vw, 68px); }
h2 { font-size: clamp(23px, 2.6vw, 38px); }
h3 { font-size: clamp(18px, 1.6vw, 24px); letter-spacing: -0.01em; }
h4 { font-size: 16px; letter-spacing: 0; }

p { margin: 0 0 1.1em; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: none; }

ul, ol { margin: 0 0 1em; padding-left: 1.2em; }
li { margin: 0.2em 0; }

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

img, svg, picture, video { max-width: 100%; height: auto; }

button { font: inherit; color: inherit; }

hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }

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

/* ---------- 3. 焦点与可访问 ---------- */
:focus { outline: none; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  left: 12px;
  top: -70px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--accent);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: var(--radius);
  transition: top 0.18s ease;
}
.skip-link:focus { top: 12px; }

/* ---------- 4. 排版工具 ---------- */
.shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.measure { max-width: 68ch; }

.eyebrow {
  display: block;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 10px 24px;
  margin: 0 0 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.section-head > :last-child { margin-bottom: 0; }
.section-head h2,
.section-head h3 { margin-bottom: 0; }

.breadcrumb { margin: 0; }
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}
.breadcrumb li { margin: 0; display: flex; align-items: center; gap: 8px; }
.breadcrumb li::after { content: "/"; color: var(--line); }
.breadcrumb li:last-child::after { content: none; }
.breadcrumb a { color: var(--text); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb [aria-current="page"] { color: var(--accent); }

/* ---------- 5. 面板 / 玻璃 / 栅格 ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.glass {
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.grid { display: grid; gap: var(--gap); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border-radius: 2px;
  border: 1px solid var(--glass-line);
  background: var(--glass);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
}
.tag--hot {
  background: rgba(255, 74, 90, 0.14);
  border-color: rgba(255, 74, 90, 0.42);
  color: #FF8A95;
}
.tag--cold {
  background: rgba(46, 125, 255, 0.14);
  border-color: rgba(46, 125, 255, 0.42);
  color: #7FB0FF;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease,
    border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}
.btn--primary { background: var(--accent); color: var(--ink); }
.btn--primary:hover {
  box-shadow: 0 0 0 3px var(--accent-soft);
  transform: translateY(-1px);
}
.btn--ghost {
  background: transparent;
  color: var(--head);
  border-color: var(--glass-line);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn--gold {
  background: linear-gradient(135deg, var(--gold-a) 0%, var(--gold-b) 100%);
  color: var(--ink);
}
.btn--gold:hover { box-shadow: 0 0 0 3px rgba(246, 210, 107, 0.22); }

/* ---------- 7. 图片 / 图表容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--panel-deep);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.media-frame img,
.media-frame svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 52%, rgba(6, 20, 15, 0.62) 100%);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

/* ---------- 8. 显现协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ==========================================================================
   9. 站点头部（框架式导航：顶部横梁 + 左轨道）
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  height: var(--header-h);
  background: rgba(6, 20, 15, 0.86);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.header-bar {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 var(--gap);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
  color: var(--head);
  text-decoration: none;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--accent);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: 2px;
}
.brand-text { display: block; }
.brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.15;
  color: var(--head);
}
.brand-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  line-height: 1.2;
  color: var(--text-dim);
}

.site-nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-list li { margin: 0; }

.nav-link {
  display: block;
  padding: 8px 12px;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease, background-color 0.18s ease,
    border-color 0.18s ease;
}
.nav-link:hover { color: var(--head); background: var(--glass); }
.nav-link[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.header-cta {
  flex: none;
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  background: var(--accent);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: 2px;
  white-space: nowrap;
  transition: box-shadow 0.18s ease, transform 0.18s ease;
}
.header-cta:hover {
  box-shadow: 0 0 0 3px var(--accent-soft);
  transform: translateY(-1px);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  position: relative;
  flex: none;
  width: 46px;
  height: 40px;
  padding: 0;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: 2px;
  cursor: pointer;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}
.nav-toggle:hover { border-color: var(--accent); }
.nav-toggle-bar {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 2px;
  background: var(--head);
  border-radius: 1px;
  transition: transform 0.22s ease;
}
.nav-toggle-bar:nth-child(1) { transform: translate(-50%, calc(-50% - 4px)); }
.nav-toggle-bar:nth-child(2) { transform: translate(-50%, calc(-50% + 4px)); }
.site-header[data-open] .nav-toggle-bar:nth-child(1) {
  transform: translate(-50%, -50%) rotate(45deg);
}
.site-header[data-open] .nav-toggle-bar:nth-child(2) {
  transform: translate(-50%, -50%) rotate(-45deg);
}

/* 滚动进度 */
.progress-track {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(255, 255, 255, 0.05);
  overflow: hidden;
}
.progress-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
}

/* ==========================================================================
   10. 左侧数据轨道
   ========================================================================== */
.data-rail {
  position: fixed;
  top: var(--header-h);
  left: 0;
  bottom: 0;
  z-index: 50;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 0 18px;
  background: linear-gradient(180deg, rgba(16, 20, 19, 0.92), rgba(6, 20, 15, 0.92));
  border-right: 1px solid var(--line);
  overflow: hidden;
}

.rail-nav { width: 100%; }
.rail-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}
.rail-list li { margin: 0; }

.rail-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  width: 100%;
  padding: 9px 6px;
  color: var(--text);
  font-size: 11px;
  line-height: 1.25;
  text-align: center;
  border-left: 2px solid transparent;
  transition: color 0.18s ease, background-color 0.18s ease,
    border-color 0.18s ease;
}
.rail-link:hover { color: var(--head); background: var(--glass); }
.rail-link[aria-current="page"] {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--glass);
}
.rail-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}
.rail-link[aria-current="page"] .rail-index { color: var(--accent); }
.rail-label { display: block; }

.rail-scale {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 100%;
}
.rail-scale span {
  display: block;
  height: 1px;
  background: var(--line);
}
.rail-scale span:nth-child(1) { width: 44px; }
.rail-scale span:nth-child(2) { width: 34px; }
.rail-scale span:nth-child(3) { width: 54px; }
.rail-scale span:nth-child(4) { width: 26px; }
.rail-scale span:nth-child(5) { width: 40px; }
.rail-scale span:nth-child(6) { width: 30px; }
.rail-scale .rail-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(200, 241, 60, 0.7);
}

/* ==========================================================================
   11. 页脚
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: 96px;
  margin-left: var(--rail-w);
  background: linear-gradient(180deg, var(--panel) 0%, #08110E 100%);
  border-top: 1px solid var(--line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 140px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.footer-frame {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px var(--gap) 28px;
}

.footer-cols {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.4fr;
  gap: 32px;
}

.footer-col { min-width: 0; }

.footer-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--accent);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
}
.footer-list li { margin: 0; }
.footer-list a {
  color: var(--text);
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}
.footer-list a:hover { color: var(--accent); border-bottom-color: var(--accent); }

.footer-brand .brand { margin-bottom: 16px; }
.footer-tagline {
  max-width: 30ch;
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}
.footer-chip {
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid var(--glass-line);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.footer-contact li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  font-size: 13px;
  color: rgba(182, 192, 186, 0.88);
}
.footer-k {
  flex: none;
  min-width: 34px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-faint);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-faint);
}

/* ==========================================================================
   12. 响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .nav-link { padding: 8px 9px; font-size: 13px; }
}

@media (max-width: 1024px) {
  :root { --rail-w: 0px; --header-h: 60px; }

  .data-rail { display: none; }
  .nav-toggle { display: block; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 55;
    margin-left: 0;
    padding: 16px var(--gap) 48px;
    overflow-y: auto;
    background: rgba(6, 20, 15, 0.98);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--line);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  }
  .site-header[data-open] .site-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-link {
    padding: 15px 12px;
    font-size: 16px;
    border-bottom: 1px solid var(--line);
    border-left: 2px solid transparent;
  }
  .nav-link[aria-current="page"] {
    color: var(--accent);
    border-bottom-color: var(--line);
    border-left-color: var(--accent);
    background: var(--glass);
  }

  body:has(.site-header[data-open]) { overflow: hidden; }

  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
}

@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  body { font-size: 15px; }
  .header-bar { gap: 10px; padding: 0 16px; }
  .header-cta { padding: 8px 12px; font-size: 12px; }
  .brand-sub { display: none; }
  .site-footer { margin-top: 64px; }
  .footer-frame { padding: 40px 16px 22px; }
}

@media (max-width: 600px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 420px) {
  .header-cta { display: none; }
  .header-bar { justify-content: space-between; }
}

/* ---------- 13. 减弱动效 ---------- */
@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;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
}