/* =========================================================
   FB赛场 · 共享样式 /assets/site.css
   夜间赛场直播控制室 · 海报式分层 · 信号索引体系
   ========================================================= */

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  color: var(--paper);
  background-color: var(--ink-night);
  background-image:
    radial-gradient(1100px 620px at 78% -12%, rgba(7, 26, 43, 0.95), transparent 68%),
    radial-gradient(820px 520px at -8% 4%, rgba(18, 54, 44, 0.58), transparent 62%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

button { font: inherit; color: inherit; }

ul,
ol { margin: 0; padding: 0; list-style: none; }

p { margin: 0 0 1em; }

a {
  color: inherit;
  text-decoration-color: rgba(43, 227, 242, 0.55);
  text-underline-offset: 3px;
}

a:hover { text-decoration-color: var(--electric-cyan); }

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

/* 2. 变量 -------------------------------------------------- */
:root {
  color-scheme: dark;

  --ink-night: #061512;
  --night-blue: #071A2B;
  --moss-panel: #12362C;
  --rock-gray: #26363A;
  --paper: #F4EDE0;
  --mist-cyan: #B8C6C0;
  --signal-orange: #FF5A2A;
  --ember: #D83A1F;
  --electric-cyan: #2BE3F2;
  --lime-signal: #B7F45B;

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

  --shell: 1220px;
  --gutter: clamp(18px, 4.2vw, 44px);
  --line: rgba(184, 198, 192, 0.16);
  --line-strong: rgba(184, 198, 192, 0.32);
  --radius: 2px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* 3. 中文排版与基础元素 ------------------------------------ */
h1, h2, h3, h4, h5 {
  margin: 0 0 0.5em;
  font-family: var(--display);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.06;
  color: var(--paper);
  text-wrap: balance;
}

h1 { font-size: clamp(2.6rem, 6.6vw, 4.6rem); }
h2 { font-size: clamp(1.9rem, 3.6vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.2vw, 1.7rem); letter-spacing: 0; }
h4 { font-size: 1.1rem; letter-spacing: 0; }

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

.mono {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist-cyan);
}

.prose { max-width: 70ch; }
.prose p { max-width: 68ch; margin: 0 0 1.15em; }
.prose h2,
.prose h3 { margin-top: 1.8em; }
.prose a { color: var(--electric-cyan); }
.prose ul,
.prose ol {
  list-style: revert;
  padding-left: 1.4em;
  margin: 0 0 1.3em;
  max-width: 66ch;
}
.prose li { margin-bottom: 0.45em; }
.prose blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--signal-orange);
  color: var(--mist-cyan);
}

/* 4. 容器与章节节奏 ---------------------------------------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(46px, 7vw, 96px); }
.section--tight { padding-block: clamp(26px, 4vw, 54px); }

/* 5. 跳至主要内容 ------------------------------------------ */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 300;
  display: inline-block;
  padding: 10px 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-night);
  background: var(--electric-cyan);
  text-decoration: none;
  border-radius: var(--radius);
  transition: top 0.22s var(--ease);
}

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

/* 6. 头部外壳 ---------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: linear-gradient(180deg, rgba(6, 21, 18, 0.94), rgba(7, 26, 43, 0.78));
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(184, 198, 192, 0.14);
  transition: background 0.35s var(--ease),
              border-color 0.35s var(--ease),
              box-shadow 0.35s var(--ease);
}

.site-header.is-solid {
  background: var(--ink-night);
  border-bottom-color: rgba(43, 227, 242, 0.42);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.42);
}

/* 转播状态条 */
.signal-bar {
  border-bottom: 1px solid rgba(184, 198, 192, 0.1);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(43, 227, 242, 0.12) 0 1px,
    transparent 1px 46px
  );
}

.signal-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 32px;
}

.signal-bar__status,
.signal-bar__meta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.13em;
  color: var(--mist-cyan);
}

.signal-bar__meta { color: rgba(184, 198, 192, 0.56); }

.signal-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--lime-signal);
  box-shadow: 0 0 0 3px rgba(183, 244, 91, 0.15);
  animation: signal-pulse 2.6s ease-in-out infinite;
}

@keyframes signal-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 3px rgba(183, 244, 91, 0.15); }
  50% { opacity: 0.6; box-shadow: 0 0 0 6px rgba(183, 244, 91, 0.05); }
}

/* 头部主行 */
.header-main {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.6vw, 34px);
  min-height: clamp(60px, 6.4vw, 76px);
}

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

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--electric-cyan);
  background: linear-gradient(135deg, rgba(43, 227, 242, 0.2), rgba(255, 90, 42, 0.16));
  border: 1px solid rgba(43, 227, 242, 0.5);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.18;
}

.brand__name {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.36rem;
  letter-spacing: 0.005em;
  color: var(--paper);
}

.brand__note {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  color: var(--mist-cyan);
}

.brand--footer .brand__mark { width: 42px; height: 42px; font-size: 14px; }
.brand--footer .brand__name { font-size: 1.6rem; }

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.5vw, 20px);
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 9px 2px;
  font-family: var(--sans);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  white-space: nowrap;
  color: rgba(244, 237, 224, 0.76);
  text-decoration: none;
  transition: color 0.22s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 3px;
  height: 1px;
  background: var(--electric-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--ease);
}

.site-nav__link:hover { color: var(--paper); }
.site-nav__link:hover::after { transform: scaleX(1); }

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

.site-nav__link[aria-current="page"]::after {
  height: 2px;
  background: var(--signal-orange);
  transform: scaleX(1);
}

.site-nav__foot { display: none; }
.site-nav__meta { margin: 0; }

/* 头部行动区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 20px;
  font-family: var(--sans);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.2;
  color: var(--paper);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s var(--ease),
              background 0.2s var(--ease),
              border-color 0.2s var(--ease),
              color 0.2s var(--ease);
}

.btn:hover { transform: translateY(-2px); }

.btn--signal {
  color: #0A1A14;
  background: var(--signal-orange);
  border-color: var(--signal-orange);
  box-shadow: 0 10px 24px rgba(255, 90, 42, 0.22);
}

.btn--signal:hover { background: #FF7448; border-color: #FF7448; }

.btn--ghost {
  color: var(--electric-cyan);
  border-color: rgba(43, 227, 242, 0.48);
  background: rgba(43, 227, 242, 0.06);
}

.btn--ghost:hover {
  color: var(--ink-night);
  background: var(--electric-cyan);
  border-color: var(--electric-cyan);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--paper);
  background: rgba(43, 227, 242, 0.08);
  border: 1px solid rgba(43, 227, 242, 0.42);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
  height: 14px;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--electric-cyan);
  transition: transform 0.26s var(--ease), opacity 0.2s var(--ease);
}

.site-header[data-open] .nav-toggle {
  background: rgba(255, 90, 42, 0.16);
  border-color: rgba(255, 90, 42, 0.7);
}

.site-header[data-open] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 滚动进度信号线 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(184, 198, 192, 0.08);
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--electric-cyan), var(--signal-orange));
  transition: transform 0.12s linear;
}

/* 7. 页脚 -------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background:
    linear-gradient(180deg, var(--ink-night), #04100E 62%, #030B0A);
  border-top: 1px solid rgba(43, 227, 242, 0.22);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--electric-cyan), var(--signal-orange), transparent);
  opacity: 0.55;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 0.85fr)) minmax(0, 1.25fr);
  gap: clamp(24px, 3vw, 44px);
  padding-block: clamp(44px, 7vw, 84px) clamp(30px, 4.5vw, 54px);
}

.footer-brand__summary {
  margin: 18px 0 14px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist-cyan);
}

.footer-brand__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 4px 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.13em;
  color: var(--electric-cyan);
  border: 1px solid rgba(43, 227, 242, 0.34);
  border-radius: var(--radius);
  background: rgba(43, 227, 242, 0.06);
}

.footer-group__label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--electric-cyan);
}

.footer-group__label::before {
  content: "";
  width: 12px;
  height: 1px;
  background: var(--signal-orange);
}

.footer-links { display: flex; flex-direction: column; gap: 2px; }

.footer-link {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: var(--mist-cyan);
  text-decoration: none;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.footer-link:hover {
  color: var(--paper);
  transform: translateX(3px);
}

.footer-contact__list { display: flex; flex-direction: column; gap: 12px; }

.footer-contact__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-contact__label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(184, 198, 192, 0.6);
}

.footer-contact__value {
  font-size: 14px;
  line-height: 1.65;
  color: var(--paper);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 20px 26px;
  border-top: 1px solid var(--line);
}

.footer-legal {
  margin: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: rgba(184, 198, 192, 0.68);
}

.footer-legal--icp {
  padding: 3px 10px;
  color: var(--mist-cyan);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* 8. 通用内容组件 ------------------------------------------ */
.kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--electric-cyan);
}

.kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.85;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--electric-cyan);
  background: rgba(43, 227, 242, 0.07);
  border: 1px solid rgba(43, 227, 242, 0.42);
  border-radius: var(--radius);
}

.tag--orange {
  color: var(--signal-orange);
  background: rgba(255, 90, 42, 0.08);
  border-color: rgba(255, 90, 42, 0.5);
}

.tag--lime {
  color: var(--lime-signal);
  background: rgba(183, 244, 91, 0.08);
  border-color: rgba(183, 244, 91, 0.45);
}

.tag--solid {
  color: var(--ink-night);
  background: var(--electric-cyan);
  border-color: transparent;
}

.breadcrumb { padding-top: 18px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mist-cyan);
}

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

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(184, 198, 192, 0.38);
}

.breadcrumb__link {
  color: var(--mist-cyan);
  text-decoration: none;
}

.breadcrumb__link:hover { color: var(--electric-cyan); }

.breadcrumb__current { color: var(--paper); }

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

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

.panel {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: linear-gradient(180deg, rgba(18, 54, 44, 0.55), rgba(7, 26, 43, 0.5));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
}

.panel--flat { background: rgba(7, 26, 43, 0.4); }

.panel--signal::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  background: linear-gradient(180deg, var(--signal-orange), rgba(255, 90, 42, 0));
}

/* 图片容器基础规则（页面阶段放置占位图） */
.media {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: linear-gradient(135deg, var(--night-blue), var(--moss-panel));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 22px 48px rgba(0, 0, 0, 0.3);
}

.media__frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.media__frame img,
.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--21x9 .media__frame { aspect-ratio: 21 / 9; }
.media--4x5 .media__frame { aspect-ratio: 4 / 5; }
.media--1x1 .media__frame { aspect-ratio: 1 / 1; }

.media--placeholder .media__frame {
  background-image:
    repeating-linear-gradient(90deg, rgba(43, 227, 242, 0.14) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(0deg, rgba(184, 198, 192, 0.08) 0 1px, transparent 1px 40px);
}

.media__caption {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 14px;
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.09em;
  color: var(--mist-cyan);
  background: rgba(6, 21, 18, 0.62);
  border-top: 1px solid var(--line);
}

/* 9. 显现动效 ---------------------------------------------- */
html.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.72s var(--ease);
}

html.reveal-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* 10. 响应式 ----------------------------------------------- */
@media (max-width: 1180px) {
  .brand__note { display: none; }
}

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }
  .header-cta { display: none; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    margin-left: 0;
    padding: 4px var(--gutter) 24px;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
    overscroll-behavior: contain;
    background: linear-gradient(180deg, rgba(7, 26, 43, 0.99), var(--ink-night) 46%);
    border-top: 1px solid rgba(43, 227, 242, 0.32);
    border-bottom: 1px solid rgba(43, 227, 242, 0.18);
    box-shadow: 0 32px 64px rgba(0, 0, 0, 0.6);
  }

  .site-header[data-open] .site-nav { display: flex; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .site-nav__list > li { border-bottom: 1px solid rgba(184, 198, 192, 0.12); }
  .site-nav__list > li:last-child { border-bottom: 0; }

  .site-nav__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 4px;
    font-size: 15px;
    letter-spacing: 0.02em;
    color: var(--paper);
  }

  .site-nav__link::after { display: none; }

  .site-nav__link[aria-current="page"] {
    color: var(--electric-cyan);
    padding-left: 16px;
  }

  .site-nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 6px;
    margin-top: -3px;
    background: var(--signal-orange);
  }

  .site-nav__foot {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid rgba(184, 198, 192, 0.14);
  }

  .site-nav__meta {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--mist-cyan);
  }

  .site-nav__foot .btn { width: 100%; }

  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .signal-bar__meta { display: none; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .signal-bar__status { font-size: 10px; letter-spacing: 0.08em; }
  .brand__mark { width: 34px; height: 34px; font-size: 12px; }
  .brand__name { font-size: 1.2rem; }
  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .media__caption { font-size: 10.5px; }
}

/* 11. 减少动效 --------------------------------------------- */
@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;
  }

  .signal-dot { animation: none; }
  .btn:hover { transform: none; }
  .footer-link:hover { transform: none; }

  html.reveal-ready [data-reveal],
  html.reveal-ready [data-reveal].is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }
}