/* ==========================================================================
   爱体育赛场 · 共享样式表 /assets/site.css
   深墨绿底的框架式外壳：顶部横梁 + 左右竖轨 + 斜切数据语言
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #07130F;
  --ink-2: #0E2A1D;
  --jade: #00A86B;
  --clay: #B33A22;
  --neon: #19E3D1;
  --ref: #FFD21F;
  --wood: #6B4A2F;
  --snow: #F4F7F5;
  --metal: #9AA8A2;
  --black: #0B0B0C;

  --hair: rgba(244, 247, 245, .12);
  --hair-strong: rgba(244, 247, 245, .28);
  --text-soft: rgba(244, 247, 245, .78);
  --text-mute: rgba(154, 168, 162, .92);

  --font-display: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-accent: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', 'DIN Alternate', 'SFMono-Regular', Consolas, monospace;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --step-hero: clamp(3.5rem, 9vw, 8rem);
  --step-section: clamp(2rem, 4.2vw, 3.75rem);
  --step-data: clamp(2.5rem, 6vw, 6rem);
  --step-body: 1rem;
  --step-caption: .8125rem;

  --topbar-h: 74px;
  --rail-w: 0px;
  --frame-x: 16px;
  --dur: 200ms;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --shadow-card: 0 1px 0 rgba(244, 247, 245, .04), 0 24px 48px -34px #000;
}

@media (min-width: 768px) {
  :root { --topbar-h: 78px; --frame-x: 22px; }
}
@media (min-width: 1180px) {
  :root { --rail-w: 44px; }
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--topbar-h) + 1.5rem);
}
body {
  margin: 0;
  padding-inline: var(--rail-w);
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(90deg, rgba(244, 247, 245, .028) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(244, 247, 245, .02) 0 1px, transparent 1px 128px),
    radial-gradient(120% 80% at 86% -12%, rgba(0, 168, 107, .18), transparent 62%),
    radial-gradient(95% 70% at 4% 108%, rgba(179, 58, 34, .16), transparent 60%);
  background-attachment: fixed;
  color: var(--snow);
  font-family: var(--font-body);
  font-size: var(--step-body);
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, p, figure, blockquote, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; }
img, svg, video { max-width: 100%; display: block; }
button { font: inherit; }
::selection { background: var(--neon); color: #04120C; }

:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 3. 中文排版基调 ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: var(--step-hero);
  line-height: 1.02;
  letter-spacing: -.03em;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: var(--step-section);
  line-height: 1.12;
  letter-spacing: -.02em;
}
.lede {
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  color: var(--text-soft);
  max-width: 46ch;
}
.numeric {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -.02em;
  font-size: var(--step-data);
  line-height: 1;
}
.numeric--glow {
  color: var(--neon);
  text-shadow: 0 0 14px rgba(25, 227, 209, .5), 0 0 2px rgba(25, 227, 209, .8);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--neon);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: linear-gradient(90deg, var(--jade), var(--clay));
  transform: skewX(-24deg);
}

/* ---------- 4. 布局容器与网格 ---------- */
.u-container {
  width: min(1320px, 100% - clamp(2rem, 6vw, 5rem));
  margin-inline: auto;
}
#main-content { display: block; padding-top: var(--topbar-h); }
.section { padding-block: clamp(3rem, 7vw, 6rem); }
.section--tight { padding-block: clamp(2rem, 4vw, 3rem); }

.grid { display: grid; gap: clamp(1rem, 2.5vw, 2rem); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: 5fr 7fr; }

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

/* ---------- 5. 基础组件 ---------- */
.card {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.75rem);
  background: linear-gradient(180deg, rgba(14, 42, 29, .92), rgba(7, 19, 15, .92));
  border: 1px solid var(--hair);
  box-shadow: var(--shadow-card);
}
.card--clay { border-left: 3px solid var(--clay); }
.card--jade { border-left: 3px solid var(--jade); }

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: .25rem .5rem;
  border: 1px solid var(--hair-strong);
  color: var(--metal);
}
.tag--jade { color: var(--jade); border-color: rgba(0, 168, 107, .5); }
.tag--neon { color: var(--neon); border-color: rgba(25, 227, 209, .5); }
.tag--ref { color: var(--ref); border-color: rgba(255, 210, 31, .5); }

.data-band {
  background: var(--black);
  border-block: 1px solid var(--hair);
  padding-block: clamp(1.5rem, 3vw, 2.5rem);
}
.data-band__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: clamp(1rem, 3vw, 2.5rem);
}

/* 按钮：斜切运动感 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .62rem 1.05rem;
  font-family: var(--font-accent);
  font-weight: 900;
  font-size: .9375rem;
  letter-spacing: .02em;
  line-height: 1.2;
  color: var(--snow);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--hair-strong);
  background: transparent;
  transform: skewX(-8deg);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn:hover { transform: skewX(-8deg) translateY(-2px); }
.btn--primary {
  background: var(--jade);
  border-color: var(--jade);
  color: #04120C;
}
.btn--primary:hover { background: var(--neon); border-color: var(--neon); }
.btn--ghost:hover { color: var(--neon); border-color: var(--neon); }

/* 媒体容器（页面阶段放置实际画面，缺图时为 CSS 纹理占位） */
.media-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--hair);
  background-color: var(--ink-2);
  background-image:
    repeating-linear-gradient(90deg, rgba(0, 168, 107, .18) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, rgba(244, 247, 245, .06) 0 1px, transparent 1px 48px),
    linear-gradient(135deg, rgba(11, 11, 12, .92), rgba(14, 42, 29, .9));
}
.media-frame--court {
  background-image:
    repeating-linear-gradient(90deg, rgba(107, 74, 47, .35) 0 1px, transparent 1px 56px),
    linear-gradient(160deg, rgba(107, 74, 47, .55), rgba(11, 11, 12, .9));
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.06) contrast(1.06);
}
.media-frame__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: .7rem 1rem;
  font-size: var(--step-caption);
  color: var(--snow);
  background: linear-gradient(180deg, transparent, rgba(7, 19, 15, .94));
}

/* 标签页 */
.tabs { display: block; }
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  border-bottom: 1px solid var(--hair);
  padding-bottom: .6rem;
}
.tabs__tab {
  appearance: none;
  cursor: pointer;
  padding: .55rem 1rem;
  font-family: var(--font-accent);
  font-weight: 900;
  font-size: .875rem;
  color: var(--metal);
  background: transparent;
  border: 1px solid transparent;
  transform: skewX(-8deg);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.tabs__tab:hover { color: var(--snow); border-color: var(--hair-strong); }
.tabs__tab[aria-selected="true"] {
  background: var(--jade);
  border-color: var(--jade);
  color: #04120C;
}
.tabs__panel { padding-top: 1.25rem; }
.tabs__panel[hidden] { display: none; }

/* 面包屑与长文 */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  font-family: var(--font-mono);
  font-size: var(--step-caption);
  color: var(--metal);
}
.breadcrumbs a { color: var(--metal); text-decoration: none; }
.breadcrumbs a:hover { color: var(--neon); }
.breadcrumbs__sep { color: rgba(154, 168, 162, .5); }

.prose {
  max-width: 72ch;
  color: var(--text-soft);
  font-size: 1rem;
  line-height: 1.78;
}
.prose h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.375rem, 2.4vw, 1.875rem);
  line-height: 1.3;
  color: var(--snow);
  margin: 2.25rem 0 .75rem;
}
.prose h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--snow);
  margin: 1.75rem 0 .5rem;
}
.prose p { margin: 0 0 1rem; }
.prose ul, .prose ol { margin: 0 0 1rem; padding-left: 1.25rem; list-style: disc; }
.prose li { margin-bottom: .45rem; }
.prose a { color: var(--neon); text-decoration: underline; text-underline-offset: 3px; }
.prose strong { color: var(--snow); }

/* 显现动效协议 */
html.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 460ms var(--ease) var(--reveal-delay, 0ms),
              transform 460ms var(--ease) var(--reveal-delay, 0ms);
}
html.reveal-ready [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 6. 框架头部 ---------- */
.skip-link {
  position: fixed;
  top: .5rem;
  left: .5rem;
  z-index: 90;
  padding: .6rem 1rem;
  background: var(--neon);
  color: #04120C;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus { transform: none; }

.frame-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
}
.frame-header__bar {
  position: relative;
  height: var(--topbar-h);
  background: rgba(7, 19, 15, .94);
  border-bottom: 1px solid var(--hair);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.frame-header__bar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, var(--jade), rgba(25, 227, 209, .5) 45%, transparent 85%);
  opacity: .55;
}
.frame-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: clamp(.75rem, 2vw, 2rem);
  padding-inline: calc(var(--rail-w) + var(--frame-x));
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: .7rem;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--snow);
}
.brand__mark {
  position: relative;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  display: block;
}
.brand__mark i {
  position: absolute;
  inset: 0;
  display: block;
  transform: skewX(-8deg);
}
.brand__mark i:first-child {
  background: linear-gradient(135deg, var(--jade), rgba(0, 168, 107, .12));
  border: 1px solid var(--jade);
}
.brand__mark i:last-child {
  inset: 9px -7px -7px 9px;
  border: 1px solid var(--clay);
  background: rgba(179, 58, 34, .18);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-family: var(--font-accent);
  font-weight: 900;
  font-size: 1.0625rem;
  letter-spacing: .01em;
}
.brand__line {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .18em;
  color: var(--metal);
  text-transform: uppercase;
}
.brand__tag {
  margin-left: .35rem;
  padding: .2rem .45rem;
  font-size: .6875rem;
  letter-spacing: .12em;
  color: var(--ref);
  border: 1px solid rgba(255, 210, 31, .42);
  transform: skewX(-8deg);
}

/* 赛季切换 */
.frame-header__switch {
  display: none;
  flex-direction: column;
  gap: .1rem;
  padding: .35rem .7rem;
  text-decoration: none;
  border-left: 1px solid var(--hair-strong);
  transition: border-color var(--dur) var(--ease);
}
.frame-header__switch-label {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .2em;
  color: var(--metal);
}
.frame-header__switch-value {
  font-size: .8125rem;
  font-weight: 700;
  color: var(--snow);
}
.frame-header__switch:hover .frame-header__switch-value { color: var(--neon); }
.frame-header__switch:hover { border-color: var(--neon); }

/* 主导航 */
.site-nav {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  min-width: 0;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: .1rem;
}
.site-nav__item { display: flex; }
.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: .4rem;
  padding: .5rem .62rem;
  font-size: .9375rem;
  font-weight: 500;
  color: var(--snow);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}
.site-nav__idx {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .08em;
  color: var(--metal);
}
.site-nav__link:hover { color: var(--neon); border-color: var(--hair-strong); }
.site-nav__link[aria-current="page"] {
  color: var(--neon);
  border-color: rgba(25, 227, 209, .45);
  background: rgba(25, 227, 209, .08);
}
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--ref); }
.site-nav__foot { display: none; }

/* 行动区与移动按钮 */
.frame-header__actions {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex: 0 0 auto;
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .5rem .7rem;
  color: var(--snow);
  background: transparent;
  border: 1px solid var(--hair-strong);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { color: var(--neon); border-color: var(--neon); }
.nav-toggle__bars { display: grid; gap: 4px; width: 20px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
  transform: skewX(-24deg);
}
.nav-toggle__bars i:nth-child(2) { width: 70%; }
.nav-toggle__label { font-size: .8125rem; letter-spacing: .12em; }

/* 滚动进度 */
.frame-header__progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--jade), var(--neon) 60%, var(--ref));
}

/* 竖轨 */
.frame-rail {
  position: fixed;
  top: var(--topbar-h);
  bottom: 0;
  width: var(--rail-w);
  z-index: 55;
  display: none;
}
.frame-rail--left {
  left: 0;
  border-right: 1px solid var(--hair);
  background: linear-gradient(180deg, rgba(0, 168, 107, .1), transparent 42%);
  pointer-events: none;
}
.frame-rail--right {
  right: 0;
  border-left: 1px solid var(--hair);
  background: linear-gradient(180deg, transparent 20%, rgba(179, 58, 34, .12));
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.6rem;
}
.frame-rail__link {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .22em;
  color: var(--metal);
  text-decoration: none;
  padding-block: .5rem;
  border-block: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.frame-rail__link:hover { color: var(--neon); border-color: var(--neon); }

@media (min-width: 1180px) {
  .frame-header__switch { display: flex; }
  .frame-rail { display: flex; }
}

/* ---------- 7. 响应式：头部断点 ---------- */
@media (min-width: 1024px) and (max-width: 1179px) {
  .site-nav__link { padding: .5rem .45rem; font-size: .875rem; }
}

@media (max-width: 960px) {
  html.is-nav-open { overflow: hidden; }
  .nav-toggle { display: inline-flex; }
  .brand__tag { display: none; }

  .site-nav {
    position: fixed;
    top: var(--topbar-h);
    right: 0;
    bottom: 0;
    width: min(88vw, 360px);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 1.4rem var(--frame-x) 2rem;
    background: var(--black);
    border-left: 1px solid var(--hair-strong);
    box-shadow: -30px 0 60px -40px #000;
    overflow-y: auto;
    transform: translateX(101%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease),
                visibility var(--dur) var(--ease);
    z-index: 70;
  }
  .site-nav[data-open] {
    transform: none;
    opacity: 1;
    visibility: visible;
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: .25rem;
  }
  .site-nav__link {
    justify-content: flex-start;
    padding: .85rem .8rem;
    font-size: 1.0625rem;
    border-bottom: 1px solid var(--hair);
  }
  .site-nav__foot {
    display: block;
    margin-top: 1.4rem;
    font-family: var(--font-mono);
    font-size: .75rem;
    letter-spacing: .08em;
    color: var(--metal);
  }
}

@media (max-width: 860px) {
  .frame-header__actions .btn--ghost { display: none; }
}
@media (max-width: 560px) {
  .brand__line { display: none; }
  .nav-toggle__label { display: none; }
  .frame-header__actions .btn--primary { padding: .55rem .7rem; font-size: .8125rem; }
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 7vw, 6rem);
  background: var(--black);
  border-top: 1px solid var(--hair);
}
.site-footer__edge {
  height: 10px;
  background: repeating-linear-gradient(-45deg, var(--clay) 0 12px, transparent 12px 26px);
  opacity: .5;
}
.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  padding-block: clamp(2.5rem, 5vw, 4rem);
}
.site-footer__mark {
  font-family: var(--font-accent);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  letter-spacing: .01em;
  color: var(--snow);
  transform: skewX(-8deg);
}
.site-footer__tag {
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .2em;
  color: var(--jade);
  text-transform: uppercase;
}
.site-footer__note {
  margin-top: 1.25rem;
  max-width: 36ch;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--metal);
}
.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 3vw, 2.5rem);
}
.site-footer__col-title {
  margin-bottom: .9rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--ref);
}
.site-footer__list { display: grid; gap: .5rem; }
.site-footer__link {
  font-size: .9375rem;
  color: var(--text-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.site-footer__link:hover { color: var(--neon); border-color: var(--neon); }
.site-footer__band {
  border-top: 1px solid var(--hair);
  background: linear-gradient(90deg, rgba(179, 58, 34, .2), rgba(0, 168, 107, .14));
}
.site-footer__band-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .6rem 1.5rem;
  padding-block: 1.1rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .03em;
  color: var(--metal);
}
.site-footer__contact { color: var(--snow); }
.site-footer__legal { max-width: 62ch; }
.site-footer__year { color: var(--neon); }

@media (max-width: 900px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  .site-footer__nav { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .site-footer__band-inner { flex-direction: column; }
}

/* ---------- 9. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.reveal-ready [data-reveal] { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .btn:hover { transform: skewX(-8deg); }
}