/* =========================================================
   三亿体育看台 · 共享样式 /assets/site.css
   深色科技运动风：堆叠切角面板 + 左侧轨道导航 + 荧光绿进度
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --c-void: #05080F;
  --c-panel: #0C1523;
  --c-forest: #0E2E2B;
  --c-indigo: #1A1436;
  --c-wine: #3A1020;
  --c-lime: #C8FF3D;
  --c-blue: #2BD9FF;
  --c-orange: #FF7A1A;
  --c-text: #E6EDF5;
  --c-muted: #93A6BC;
  --c-mint: #3FE0A6;
  --c-stroke: #243A5E;

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

  --rail-w: 248px;
  --rail-w-min: 76px;
  --bar-h: 60px;
  --cut-corner: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  --cut-slant: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  --dur: .24s;
  --dur-fast: .18s;
  --shadow-panel: 0 18px 48px rgba(0, 0, 0, .55);
}

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

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

body {
  margin: 0;
  padding-top: var(--bar-h);
  background: var(--c-void);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

::selection { background: var(--c-lime); color: #06110A; }

:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 3px;
}

#main-content {
  display: block;
  scroll-margin-top: calc(var(--bar-h) + 12px);
}

/* ---------- 3. 排版原子 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.18;
}

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--c-blue);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--c-lime);
  transform: skewX(-24deg);
}

.prose {
  max-width: 38em;
  font-size: 17px;
  line-height: 1.78;
  color: #D6E2F0;
}

.prose p + p { margin-top: 1em; }
.prose h2 { font-size: 24px; margin-top: 1.6em; }
.prose h3 { font-size: 19px; margin-top: 1.4em; }
.prose strong { color: var(--c-lime); }
.prose a { color: var(--c-blue); border-bottom: 1px solid rgba(43, 217, 255, .4); }

/* ---------- 4. 布局 ---------- */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 40px);
}

.section {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0;
}

.section__head { margin-bottom: clamp(24px, 3vw, 40px); }

.section__title {
  position: relative;
  padding-left: 18px;
  font-size: clamp(28px, 4vw, 40px);
}

.section__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: .18em;
  bottom: .18em;
  width: 4px;
  background: var(--c-lime);
  transform: skewX(-12deg);
}

.section__lead {
  margin-top: 12px;
  max-width: 34em;
  color: var(--c-muted);
  font-size: 17px;
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}

.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); }
.grid--split-rev { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }

.divider {
  height: 1px;
  margin: 24px 0;
  background: linear-gradient(90deg, var(--c-stroke), rgba(36, 58, 94, 0));
}

/* ---------- 5. 面板 ---------- */
.panel {
  position: relative;
  background: var(--c-panel);
  clip-path: var(--cut-corner);
  box-shadow: inset 0 0 0 1px var(--c-stroke), var(--shadow-panel);
}

.panel--forest { background: var(--c-forest); }
.panel--indigo { background: var(--c-indigo); }
.panel--wine { background: var(--c-wine); }

.panel__index {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--c-muted);
  background: linear-gradient(90deg, rgba(43, 217, 255, .12), rgba(43, 217, 255, 0));
  border-bottom: 1px solid var(--c-stroke);
}

.panel__index b { color: var(--c-lime); font-weight: 600; }

.panel__body { padding: clamp(20px, 3vw, 32px); }

.panel__foot {
  padding: 14px 18px;
  border-top: 1px solid var(--c-stroke);
  font-size: 14px;
  color: var(--c-muted);
  background: rgba(5, 8, 15, .35);
}

/* ---------- 6. 数据与标签 ---------- */
.stat { display: flex; flex-direction: column; gap: 6px; }

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--c-lime);
  font-variant-numeric: tabular-nums;
}

.stat__label { font-size: 14px; color: var(--c-muted); }

.chip-row { display: flex; flex-wrap: wrap; gap: 10px; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-muted);
  background: rgba(36, 58, 94, .28);
  box-shadow: inset 0 0 0 1px var(--c-stroke);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  transition: color var(--dur-fast) ease, background-color var(--dur-fast) ease;
}

.chip:hover { color: var(--c-text); background: rgba(43, 217, 255, .16); }

.chip[aria-pressed="true"] {
  color: #06110A;
  background: var(--c-lime);
  font-weight: 700;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-blue);
  box-shadow: inset 0 0 0 1px rgba(43, 217, 255, .4);
  background: rgba(43, 217, 255, .08);
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

.tag--live {
  color: var(--c-orange);
  background: rgba(255, 122, 26, .1);
  box-shadow: inset 0 0 0 1px rgba(255, 122, 26, .45);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .06em;
  clip-path: var(--cut-slant);
  transition: transform var(--dur-fast) ease, background-color var(--dur-fast) ease,
              color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}

.btn__glyph { font-size: 11px; line-height: 1; }
.btn__label { white-space: nowrap; }

.btn--primary {
  background: var(--c-lime);
  color: #06110A;
  font-weight: 700;
}

.btn--primary:hover { background: #DCFF74; transform: translateY(-2px); }

.btn--ghost {
  background: rgba(43, 217, 255, .07);
  color: var(--c-blue);
  box-shadow: inset 0 0 0 1px var(--c-stroke);
}

.btn--ghost:hover {
  color: var(--c-text);
  background: rgba(43, 217, 255, .16);
  transform: translateY(-2px);
}

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

.btn:focus-visible { outline: 2px solid var(--c-blue); outline-offset: -4px; }

/* ---------- 8. 面包屑 ---------- */
.breadcrumb { padding: 18px 0; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-muted);
}

.breadcrumb__item { display: flex; align-items: center; gap: 8px; }
.breadcrumb__sep { color: var(--c-stroke); }
.breadcrumb__link:hover { color: var(--c-blue); }
.breadcrumb__item[aria-current="page"] { color: var(--c-text); }

/* ---------- 9. 图片容器 ---------- */
.img-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--c-panel), #071120);
  clip-path: var(--cut-corner);
  box-shadow: inset 0 0 0 1px var(--c-stroke);
}

.img-frame--wide { aspect-ratio: 21 / 9; }
.img-frame--portrait { aspect-ratio: 4 / 5; }

.img-frame__media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.img-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-muted);
}

/* ---------- 10. 页头（移动端顶栏 + 抽屉） ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: linear-gradient(180deg, #070D18, #05080F);
  border-bottom: 1px solid var(--c-stroke);
}

.skip-link {
  position: absolute;
  top: -80px;
  left: 12px;
  z-index: 90;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  background: var(--c-lime);
  color: #06110A;
  transition: top var(--dur-fast) ease;
}

.skip-link:focus { top: 10px; }

.rail__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: var(--bar-h);
  padding: 0 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand__mark { width: 30px; height: 30px; flex: none; }

.brand__line {
  fill: none;
  stroke-width: 2.4;
  stroke-linecap: square;
}

.brand__line--a { stroke: var(--c-blue); }
.brand__line--b { stroke: var(--c-lime); }
.brand__line--c { stroke: var(--c-orange); }
.brand__node { fill: var(--c-lime); }

.brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: .01em;
  line-height: 1.25;
  color: var(--c-text);
  white-space: nowrap;
}

.brand__domain {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  line-height: 1.4;
  color: var(--c-muted);
  white-space: nowrap;
}

.rail__toggle,
.nav-toggle {
  display: none;
  flex: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  color: var(--c-text);
  box-shadow: inset 0 0 0 1px var(--c-stroke);
  background: rgba(36, 58, 94, .22);
  transition: background-color var(--dur-fast) ease, color var(--dur-fast) ease;
}

.rail__toggle:hover,
.nav-toggle:hover { background: rgba(43, 217, 255, .16); color: var(--c-blue); }

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

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
  transition: background-color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}

.site-header[data-open] .nav-toggle__bars {
  background: transparent;
  box-shadow: none;
}

.site-header[data-open] .nav-toggle__bars::before,
.site-header[data-open] .nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  top: 1px;
  width: 18px;
  height: 2px;
  background: var(--c-lime);
}

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

.rail__toggle-bars::before {
  content: "«";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
}

.rail {
  position: fixed;
  left: 0;
  right: 0;
  top: var(--bar-h);
  z-index: 59;
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-height: calc(100dvh - var(--bar-h));
  overflow-y: auto;
  padding: 20px 16px 28px;
  background: #070D18;
  border-bottom: 1px solid var(--c-stroke);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-14px);
  pointer-events: none;
  transition: opacity var(--dur) ease, transform var(--dur) ease, visibility var(--dur) ease;
}

.site-header[data-open] .rail {
  opacity: 1;
  visibility: visible;
  transform: none;
  pointer-events: auto;
}

.nav__list { display: flex; flex-direction: column; }

.nav__item { border-bottom: 1px solid rgba(36, 58, 94, .5); }

.nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 12px;
  font-size: 16px;
  color: var(--c-muted);
  transition: color var(--dur-fast) ease, background-color var(--dur-fast) ease,
              padding-left var(--dur-fast) ease;
}

.nav__link:hover {
  color: var(--c-text);
  background: rgba(43, 217, 255, .07);
  padding-left: 16px;
}

.nav__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-stroke);
  transition: color var(--dur-fast) ease;
}

.nav__label { white-space: nowrap; }

.nav__link:hover .nav__index,
.nav__link[aria-current="page"] .nav__index { color: var(--c-lime); }

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

.nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 4px;
  height: 22px;
  background: var(--c-lime);
  transform: translateY(-50%) skewX(-14deg);
}

.rail__actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}

.rail__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-muted);
}

.rail__note::before { content: "// "; color: var(--c-stroke); }

/* ---------- 11. 阅读进度 ---------- */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 70;
  height: 3px;
  background: rgba(36, 58, 94, .45);
  pointer-events: none;
}

.progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-lime) 0%, var(--c-blue) 70%, var(--c-orange) 100%);
  transition: transform .1s linear;
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 110px);
  background: linear-gradient(180deg, #05080F 0%, #0A111D 60%, #05080F 100%);
  border-top: 1px solid var(--c-stroke);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--c-lime), rgba(200, 255, 61, 0) 42%,
              rgba(43, 217, 255, 0) 58%, var(--c-blue));
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  padding: clamp(40px, 6vw, 72px) 0;
}

.footer__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -.01em;
  color: var(--c-text);
}

.footer__tagline {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--c-lime);
}

.footer__domain {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-muted);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.footer__col-title {
  position: relative;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--c-text);
}

.footer__col-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  background: var(--c-blue);
  transform: translateY(-50%) skewX(-14deg);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.footer__link {
  display: inline-block;
  font-size: 15px;
  color: var(--c-muted);
  transition: color var(--dur-fast) ease, transform var(--dur-fast) ease;
}

.footer__link:hover {
  color: var(--c-blue);
  transform: translateX(3px);
}

.contact-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.contact-list__row { display: grid; gap: 2px; }

.contact-list__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-muted);
}

.contact-list__value {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--c-text);
  word-break: break-word;
}

.contact-note {
  margin-top: 12px;
  max-width: 34em;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 20px;
  padding: 20px 0 28px;
  border-top: 1px solid var(--c-stroke);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-muted);
}

.footer__legal-line { color: var(--c-text); }
.footer__copy { color: var(--c-muted); }

/* ---------- 13. 显现与计数 ---------- */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translate3d(-12px, 12px, 0);
}

.js-ready [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  transition: opacity .32s ease, transform .32s cubic-bezier(.2, .7, .2, 1);
}

.js-ready [data-reveal][data-delay="1"] { transition-delay: .06s; }
.js-ready [data-reveal][data-delay="2"] { transition-delay: .12s; }
.js-ready [data-reveal][data-delay="3"] { transition-delay: .18s; }

[data-count-to] { font-variant-numeric: tabular-nums; }

/* ---------- 14. 平板 ---------- */
@media (min-width: 641px) and (max-width: 1024px) {
  .footer__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); }
  .footer__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--split,
  .grid--split-rev { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 15. 桌面：侧边轨道 ---------- */
@media (min-width: 1025px) {
  :root { --rail-w: 248px; }
  :root[data-rail-collapsed] { --rail-w: var(--rail-w-min); }

  body {
    padding-top: 0;
    padding-left: var(--rail-w);
    transition: padding-left var(--dur) ease;
  }

  #main-content { scroll-margin-top: 12px; }

  .site-header {
    top: 0;
    right: auto;
    bottom: 0;
    width: var(--rail-w);
    display: flex;
    flex-direction: column;
    border-bottom: 0;
    border-right: 1px solid var(--c-stroke);
    background: linear-gradient(180deg, #070D18, #05080F 70%);
    transition: width var(--dur) ease;
  }

  .skip-link { left: 10px; }

  .rail__top {
    height: auto;
    padding: 20px 16px;
    border-bottom: 1px solid var(--c-stroke);
  }

  .nav-toggle { display: none; }
  .rail__toggle { display: inline-flex; }

  .rail {
    position: static;
    flex: 1;
    z-index: auto;
    max-height: none;
    overflow: visible;
    padding: 16px 12px 20px;
    background: transparent;
    border-bottom: 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    transition: none;
  }

  .nav__item { border-bottom: 0; }

  .nav__link {
    padding: 11px 10px;
    font-size: 15px;
  }

  .nav__link:hover { padding-left: 14px; }

  .rail__actions { margin-top: auto; }

  /* 收起态 */
  :root[data-rail-collapsed] .brand__text { display: none; }

  :root[data-rail-collapsed] .rail__top {
    flex-direction: column;
    gap: 14px;
    padding: 20px 8px;
  }

  :root[data-rail-collapsed] .rail__toggle-bars::before { content: "»"; }

  :root[data-rail-collapsed] .nav__link {
    justify-content: center;
    padding: 12px 0;
  }

  :root[data-rail-collapsed] .nav__link:hover { padding-left: 0; }
  :root[data-rail-collapsed] .nav__label { display: none; }
  :root[data-rail-collapsed] .btn__label { display: none; }
  :root[data-rail-collapsed] .btn--rail { padding: 12px 0; }
  :root[data-rail-collapsed] .rail__note { display: none; }

  .footer__grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.6fr) minmax(0, 1.2fr);
  }

  .footer__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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

  .btn:hover,
  .footer__link:hover,
  .nav__link:hover {
    transform: none;
  }
}