/* =========================================================
   爱体育赛场 · 城市脉搏 — 共享 Site Kit
   /assets/site.css
   ========================================================= */

/* ---------- 1. Token ---------- */
:root {
  --ink: #081826;
  --ink-2: #0E2233;
  --ink-3: #0A1D2C;
  --electric: #2F7CFF;
  --electric-soft: #8FB8FF;
  --flame: #FF6B2C;
  --amber: #FFB18A;
  --fog: #F2F5F8;
  --steel: #7A8896;
  --grass: #2FBF71;
  --clay: #B74A32;

  --line: rgba(122, 136, 150, 0.24);
  --line-soft: rgba(122, 136, 150, 0.14);

  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-display: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --shell: 1320px;
  --gutter: clamp(16px, 4vw, 48px);
  --header-h: 76px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --skew: -6deg;
}

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

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

body {
  margin: 0;
  padding-top: var(--header-h);
  background: var(--ink);
  color: rgba(242, 245, 248, 0.86);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
main { display: block; }

::selection { background: var(--electric); color: #fff; }

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

/* ---------- 3. 中文排版基底 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--fog);
  text-wrap: balance;
}

strong { font-weight: 700; }

/* ---------- 4. 布局 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.split {
  display: grid;
  grid-template-columns: 34fr 66fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.keyline {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}

/* ---------- 5. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 2000;
  padding: 10px 20px;
  background: var(--flame);
  color: #08141f;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: top 0.18s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 6. 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  background-image: linear-gradient(
    180deg,
    rgba(8, 24, 38, 0.94) 0%,
    rgba(8, 24, 38, 0.62) 58%,
    rgba(8, 24, 38, 0) 100%
  );
  border-bottom: 1px solid transparent;
  transition: background-color 0.22s var(--ease),
              border-color 0.22s var(--ease),
              box-shadow 0.22s var(--ease);
}

.site-header[data-scrolled="true"] {
  background-color: rgba(8, 24, 38, 0.98);
  border-bottom-color: var(--line);
  box-shadow: 0 18px 44px -32px rgba(0, 0, 0, 0.95);
}

.site-header__shell {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 40px);
  min-height: var(--header-h);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  padding-block: 12px;
}

.brand__signal {
  display: block;
  width: 9px;
  height: 34px;
  background: linear-gradient(180deg, var(--flame) 0 44%, var(--electric) 44% 100%);
  transform: skewX(var(--skew));
  transition: transform 0.18s var(--ease);
}
.brand:hover .brand__signal { transform: skewX(var(--skew)) translateY(-2px); }

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--fog);
}

.brand__sub {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.26em;
  color: var(--steel);
  text-transform: uppercase;
}

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

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 30px);
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding-block: 6px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(242, 245, 248, 0.76);
  transition: color 0.16s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--electric);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.18s var(--ease), background-color 0.18s var(--ease);
}

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

.site-nav__link[aria-current="page"] { color: var(--fog); }
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--flame);
}

.site-nav__meta { display: none; }

/* 右侧工具区 */
.site-header__tools {
  position: relative;
  z-index: 1002;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 8px;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  white-space: nowrap;
  transition: background-color 0.16s var(--ease),
              color 0.16s var(--ease),
              border-color 0.16s var(--ease),
              transform 0.16s var(--ease);
}

.cta--ghost {
  color: var(--fog);
  border-color: rgba(47, 124, 255, 0.62);
  background: transparent;
}
.cta--ghost:hover {
  background: var(--electric);
  border-color: var(--electric);
  color: #ffffff;
  transform: translateY(-2px);
}

/* 汉堡 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  background: transparent;
  border: 1px solid rgba(122, 136, 150, 0.5);
  border-radius: 0;
  color: var(--fog);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}
.nav-toggle:hover { border-color: var(--electric); background: rgba(47, 124, 255, 0.14); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: var(--fog);
  transition: background-color 0.16s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--fog);
  transition: transform 0.2s var(--ease);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle__label { line-height: 1; }

.site-header[data-open="true"] { background-color: var(--ink); }
.site-header[data-open="true"] .nav-toggle__bars { background: transparent; }
.site-header[data-open="true"] .nav-toggle__bars::before,
.site-header[data-open="true"] .nav-toggle__bars::after { background: var(--flame); }
.site-header[data-open="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

/* 阅读进度脉冲条 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--line-soft);
  overflow: hidden;
}
.scroll-progress__fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--electric) 0%, var(--flame) 100%);
  transition: width 0.1s linear;
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 112px);
  padding-top: clamp(40px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 82% 0%, rgba(47, 124, 255, 0.13), transparent 58%),
    linear-gradient(180deg, var(--ink-3) 0%, #061320 100%);
  border-top: 1px solid var(--line);
  color: rgba(242, 245, 248, 0.7);
  font-size: 14px;
  overflow: hidden;
}

.site-footer__pulse {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--electric) 0%,
    var(--electric) 38%,
    var(--flame) 38%,
    var(--flame) 52%,
    rgba(122, 136, 150, 0.28) 52%,
    rgba(122, 136, 150, 0.28) 100%
  );
}

.site-footer__shell {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr) minmax(0, 1.05fr);
  gap: clamp(28px, 4vw, 64px);
  padding-bottom: clamp(32px, 5vw, 56px);
}

.site-footer__lead { min-width: 0; }

.footer-brand { display: block; margin-bottom: 18px; }

.footer-brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--fog);
  transform: skewX(var(--skew));
  transform-origin: left center;
}

.footer-brand__sub {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--steel);
}

.site-footer__intro {
  max-width: 38ch;
  margin-bottom: 18px;
  color: rgba(242, 245, 248, 0.62);
  line-height: 1.9;
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border: 1px solid;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  white-space: nowrap;
}
.tag--grass { color: var(--grass); border-color: rgba(47, 191, 113, 0.55); }
.tag--clay { color: #E2856F; border-color: rgba(183, 74, 50, 0.75); }
.tag--electric { color: var(--electric-soft); border-color: rgba(47, 124, 255, 0.55); }

.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
  align-content: start;
}

.footer-col__title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--steel);
  line-height: 1.4;
}

.footer-col__list { display: grid; }

.footer-col__link {
  display: inline-block;
  padding: 7px 0;
  color: rgba(242, 245, 248, 0.72);
  font-size: 14px;
  transition: color 0.16s var(--ease), transform 0.16s var(--ease);
}
.footer-col__link:hover {
  color: var(--fog);
  transform: translateX(3px);
}

.site-footer__contact { min-width: 0; }

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

.contact-list__row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
}

.contact-list__key {
  min-width: 36px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.contact-list__val {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.01em;
  color: var(--fog);
  word-break: break-all;
}

.contact-list__val--text {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.75;
  word-break: normal;
  color: rgba(242, 245, 248, 0.78);
}

.copy-btn {
  padding: 3px 8px;
  background: transparent;
  border: 1px solid rgba(47, 124, 255, 0.5);
  border-radius: 0;
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: background-color 0.16s var(--ease),
              color 0.16s var(--ease),
              border-color 0.16s var(--ease);
}
.copy-btn:hover {
  background: var(--electric);
  border-color: var(--electric);
  color: #ffffff;
}
.copy-btn[data-copied="true"] {
  background: var(--grass);
  border-color: var(--grass);
  color: #06121c;
}

.site-footer__note {
  margin-top: 16px;
  font-size: 12px;
  line-height: 1.8;
  color: var(--steel);
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding-block: 22px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--steel);
}

.site-footer__legal {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.site-footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.site-footer__legal-links a {
  color: var(--steel);
  transition: color 0.16s var(--ease);
}
.site-footer__legal-links a:hover { color: var(--amber); }

/* ---------- 8. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 0;
  background: var(--electric);
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color 0.16s var(--ease),
              color 0.16s var(--ease),
              border-color 0.16s var(--ease),
              transform 0.16s var(--ease);
}
.btn:hover { transform: translateY(-2px); }

.btn--ghost {
  background: transparent;
  border-color: rgba(242, 245, 248, 0.28);
  color: var(--fog);
}
.btn--ghost:hover { border-color: var(--electric); color: var(--fog); }

.btn--flame {
  background: var(--flame);
  color: #08141f;
}
.btn--flame:hover { background: #FF824D; }

.btn--line {
  background: transparent;
  border-color: var(--electric);
  color: var(--fog);
}
.btn--line:hover { background: rgba(47, 124, 255, 0.16); }

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
}
.breadcrumbs a { transition: color 0.16s var(--ease); }
.breadcrumbs a:hover { color: var(--amber); }
.breadcrumbs__sep { color: rgba(122, 136, 150, 0.6); }
.breadcrumbs [aria-current="page"] { color: var(--fog); }

/* ---------- 10. 正文容器 ---------- */
.prose {
  max-width: 760px;
  font-size: 17px;
  line-height: 1.9;
  color: rgba(242, 245, 248, 0.8);
}
.prose > * + * { margin-top: 1.05em; }

.prose h2 {
  margin-top: 1.9em;
  font-size: clamp(26px, 3vw, 34px);
  color: var(--fog);
}
.prose h3 {
  margin-top: 1.5em;
  font-size: clamp(19px, 2vw, 23px);
  font-weight: 800;
  color: var(--fog);
}

.prose ul { padding-left: 0; }
.prose li {
  position: relative;
  padding-left: 20px;
  margin-top: 0.55em;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 8px;
  height: 2px;
  background: var(--electric);
}

.prose strong { color: var(--fog); }

.prose a {
  color: var(--amber);
  text-decoration: underline;
  text-decoration-color: rgba(255, 177, 138, 0.5);
  text-underline-offset: 4px;
  transition: text-decoration-color 0.16s var(--ease), color 0.16s var(--ease);
}
.prose a:hover { text-decoration-color: var(--amber); }

/* 雾白阅读区 */
.reading-panel {
  background: var(--fog);
  color: #22303D;
  padding: clamp(28px, 5vw, 64px);
}
.reading-panel .prose { color: #22303D; }
.reading-panel .prose h2,
.reading-panel .prose h3,
.reading-panel .prose strong { color: #081826; }
.reading-panel .prose a { color: #1C4FA8; text-decoration-color: rgba(28, 79, 168, 0.4); }

/* ---------- 11. 章节头 / 展签 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--steel);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--flame);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.section-head__title {
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

/* ---------- 12. 数字锚点 ---------- */
.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(48px, 7vw, 88px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--fog);
}

/* ---------- 13. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--ink-2);
  border: 1px solid var(--line);
}
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(47, 124, 255, 0.18);
  pointer-events: none;
}

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s var(--ease);
}
.media-frame:hover > img { transform: scale(1.02); }

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 12px;
  background: rgba(8, 24, 38, 0.84);
  color: var(--fog);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
}

/* ---------- 14. 滚动显现 ---------- */
html[data-js="true"] [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
html[data-js="true"] [data-reveal][data-reveal-done="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1024px) {
  .site-footer__shell {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .site-footer__contact { grid-column: 1 / -1; }
}

@media (max-width: 940px) {
  :root { --header-h: 64px; }

  .nav-toggle { display: inline-flex; }
  .site-header__tools { margin-left: auto; }
  .cta--ghost { display: none; }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 880;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    margin-left: 0;
    padding: calc(var(--header-h) + 26px) var(--gutter) 40px;
    background:
      radial-gradient(130% 70% at 84% 0%, rgba(47, 124, 255, 0.18), transparent 62%),
      var(--ink);
    border-right: 1px solid var(--line);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-3%);
    transition: opacity 0.2s var(--ease),
                transform 0.26s var(--ease),
                visibility 0.26s var(--ease);
  }

  .site-header[data-open="true"] .site-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

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

  .site-nav__link {
    display: block;
    padding: 16px 0 16px 16px;
    border-bottom: 1px solid var(--line-soft);
    border-left: 2px solid transparent;
    font-size: 21px;
    font-weight: 800;
    letter-spacing: 0.02em;
    color: rgba(242, 245, 248, 0.84);
  }
  .site-nav__link::after { display: none; }
  .site-nav__link:hover,
  .site-nav__link[aria-current="page"] {
    border-left-color: var(--flame);
    color: var(--fog);
    background: rgba(47, 124, 255, 0.1);
  }

  .site-nav__meta {
    display: block;
    margin-top: auto;
    padding-top: 28px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--steel);
  }

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

@media (max-width: 680px) {
  .brand__name { font-size: 17px; }
  .brand__sub { font-size: 9px; letter-spacing: 0.2em; }

  .site-footer { margin-top: clamp(44px, 10vw, 72px); }
  .site-footer__shell { grid-template-columns: minmax(0, 1fr); }
  .site-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__contact { grid-column: auto; }

  .site-footer__base {
    flex-direction: column;
    align-items: flex-start;
  }

  .prose { font-size: 16px; }
  .breadcrumbs { padding-block: 14px; }
}

@media (max-width: 420px) {
  .site-footer__cols { grid-template-columns: minmax(0, 1fr); }
  .brand__signal { height: 28px; }
}

/* ---------- 16. 减少动效 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  html[data-js="true"] [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .media-frame:hover > img { transform: none; }
  .btn:hover,
  .cta--ghost:hover,
  .footer-col__link:hover,
  .brand:hover .brand__signal { transform: none; }
}