/* =========================================================
   爱体育中心 · 共享站点样式
   路径：/assets/site.css
   ========================================================= */

:root {
  /* 色彩体系 */
  --ink-900: #0A1428;
  --ink-800: #10203A;
  --ink-700: #1B3350;
  --ink-600: #2C4767;
  --yellow: #FFD24A;
  --orange: #FF6B2C;
  --cyan: #37F0D8;
  --white: #F2F6FF;
  --steel: #8FA6C4;
  --paper: #F4EFE6;
  --black: #0B0F16;

  --bg: var(--ink-900);
  --surface: var(--ink-700);
  --line: var(--ink-600);
  --text: var(--white);
  --text-dim: var(--steel);

  /* 字体三层节奏 */
  --font-display: "Oswald", "Barlow Condensed", "Arial Narrow", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-editorial: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, "SimSun", serif;
  --font-body: "Noto Sans SC", "Inter", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Consolas, "Courier New", monospace;

  /* 度量 */
  --gutter: 16px;
  --maxw: 1280px;
  --header-h: 98px;
  --radius: 2px;
  --shadow: 0 2px 12px rgba(0, 0, 0, .35);
  --ease: cubic-bezier(.2, .7, .2, 1);
}

@media (min-width: 768px) {
  :root { --gutter: 24px; }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--white);
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
figure { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

::selection { background: var(--yellow); color: var(--ink-900); }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 1px;
}

main { padding-top: var(--header-h); }

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

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

@media (min-width: 768px) {
  .grid { grid-template-columns: repeat(12, minmax(0, 1fr)); }
}

/* ---------- 工具类 ---------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.is-hidden { display: none !important; }

/* ---------- 跳至主内容 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 200;
  display: inline-block;
  padding: 10px 18px;
  background: var(--yellow);
  color: var(--ink-900);
  font-weight: 700;
  font-size: 14px;
  border-radius: var(--radius);
  transition: top 200ms var(--ease);
}

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

/* =========================================================
   页头
   ========================================================= */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(10, 20, 40, .82) 0%, rgba(10, 20, 40, 0) 100%);
  transition: background-color 240ms var(--ease), box-shadow 240ms var(--ease);
}

.site-header[data-stuck] {
  background: rgba(10, 20, 40, .95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 rgba(44, 71, 103, .9), 0 14px 34px rgba(0, 0, 0, .45);
}

/* 顶部状态条 */
.site-header__topline {
  height: 34px;
  overflow: hidden;
  border-bottom: 1px solid rgba(44, 71, 103, .55);
  background: rgba(10, 20, 40, .55);
  transition: height 240ms var(--ease), opacity 200ms var(--ease), border-color 200ms var(--ease);
}

.site-header[data-stuck] .site-header__topline {
  height: 0;
  opacity: 0;
  border-color: transparent;
}

.site-header__topline-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 34px;
}

.site-header__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--steel);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(55, 240, 216, .14);
}

.status-sep { color: var(--ink-600); }

.status-link {
  color: var(--yellow);
  border-bottom: 1px solid transparent;
  transition: border-color 160ms var(--ease);
}

.status-link:hover { border-bottom-color: var(--yellow); }

.utility-nav { display: inline-flex; align-items: center; gap: 14px; }

.utility-nav__link {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--steel);
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.utility-nav__link:hover { color: var(--white); border-bottom-color: var(--cyan); }

/* 主导航行 */
.site-header__main-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 64px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius);
  background: var(--yellow);
  color: var(--ink-900);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -.03em;
  box-shadow: 0 0 0 1px rgba(255, 210, 74, .3);
}

.brand__text { display: flex; flex-direction: column; line-height: 1.2; }

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .02em;
  color: var(--white);
}

.brand__line {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .07em;
  color: var(--steel);
}

.brand--footer .brand__name { font-size: 20px; }
.brand--footer .brand__line { letter-spacing: .04em; }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
}

.site-nav__list { display: flex; align-items: center; gap: 2px; }

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 12px;
  font-size: 14.5px;
  font-weight: 500;
  color: rgba(242, 246, 255, .82);
  border-radius: var(--radius);
  transition: color 180ms var(--ease), background-color 180ms var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 4px;
  height: 1px;
  background: var(--yellow);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 220ms var(--ease), background-color 180ms var(--ease);
}

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

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

.site-nav__cta { flex: 0 0 auto; }

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(27, 51, 80, .6);
  color: var(--white);
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .08em;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle__bars i {
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: transform 200ms var(--ease), opacity 160ms var(--ease);
}

.nav-toggle__bars i:nth-child(1) { top: 0; }
.nav-toggle__bars i:nth-child(2) { top: 5px; }
.nav-toggle__bars i:nth-child(3) { top: 10px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.nav-toggle__label { display: inline; }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--yellow) 55%, var(--orange) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

/* 移动端导航展开 */
@media (max-width: 860px) {
  :root { --header-h: 64px; }

  .site-header__topline { display: none; }

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

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 8px var(--gutter) 26px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: rgba(10, 20, 40, .98);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 52px rgba(0, 0, 0, .55);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 200ms var(--ease), transform 200ms var(--ease), visibility 200ms linear;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

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

  .site-nav__link {
    display: block;
    padding: 14px 10px;
    font-size: 16px;
    border-bottom: 1px solid rgba(44, 71, 103, .5);
    border-radius: 0;
  }

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

  .site-nav__link[aria-current="page"] {
    color: var(--yellow);
    background: rgba(255, 210, 74, .07);
  }

  .site-nav__cta {
    margin-top: 18px;
    justify-content: center;
    width: 100%;
  }
}

/* =========================================================
   按钮
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: .72em 1.15em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1;
  text-align: center;
  cursor: pointer;
  transition: background-color 180ms var(--ease), color 180ms var(--ease),
              border-color 180ms var(--ease), transform 180ms var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn--sm { padding: .58em .95em; font-size: 13px; }

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #16080A;
}

.btn--primary:hover { background: #FF8248; border-color: #FF8248; }

.btn--yellow {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--ink-900);
}

.btn--yellow:hover { background: #FFE483; border-color: #FFE483; }

.btn--ghost {
  background: transparent;
  border-color: var(--ink-600);
  color: var(--white);
}

.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

/* =========================================================
   面包屑
   ========================================================= */
.breadcrumb { padding-top: 18px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--steel);
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb__link {
  color: var(--steel);
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.breadcrumb__link:hover { color: var(--yellow); border-bottom-color: var(--yellow); }

.breadcrumb__sep { color: var(--ink-600); }

.breadcrumb__item[aria-current="page"] { color: var(--cyan); }

/* =========================================================
   正文 / 索引
   ========================================================= */
.prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(242, 246, 255, .86);
}

.prose > * + * { margin-top: 1.1em; }
.prose p { margin: 0 0 1.25em; }

.prose h2 {
  font-size: clamp(24px, 3vw, 32px);
  margin: 2.2em 0 .75em;
}

.prose h3 {
  font-size: 20px;
  margin: 1.8em 0 .6em;
}

.prose strong { color: var(--white); font-weight: 600; }

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(55, 240, 216, .4);
  transition: border-color 160ms var(--ease);
}

.prose a:hover { border-bottom-color: var(--cyan); }

.prose ul,
.prose ol {
  margin: 0 0 1.25em;
  padding-left: 1.3em;
  list-style: revert;
}

.prose li { margin-bottom: .45em; }

.prose blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--orange);
  font-family: var(--font-editorial);
  font-size: 18px;
  color: rgba(242, 246, 255, .78);
}

.prose--on-paper { color: rgba(11, 15, 22, .84); }
.prose--on-paper strong { color: var(--black); }
.prose--on-paper a { color: #0B5F55; border-bottom-color: rgba(11, 95, 85, .4); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--yellow);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--orange);
}

.section-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: 22px;
}

.section-heading__title { font-size: clamp(24px, 3vw, 32px); }

.section-heading__note {
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--steel);
}

/* 数据与卡片 */
.data-value {
  font-family: var(--font-data);
  font-weight: 700;
  letter-spacing: .02em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border: 1px solid rgba(55, 240, 216, .35);
  border-radius: var(--radius);
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--cyan);
  white-space: nowrap;
}

.data-chip--yellow { border-color: rgba(255, 210, 74, .4); color: var(--yellow); }
.data-chip--orange { border-color: rgba(255, 107, 44, .45); color: var(--orange); }

.panel {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--ink-700) 0%, var(--ink-800) 100%);
  box-shadow: var(--shadow);
}

.panel--flush { padding: 0; }

/* 浅色画册分区 */
.paper {
  background-color: var(--paper);
  background-image: radial-gradient(rgba(11, 15, 22, .04) 1px, transparent 0);
  background-size: 4px 4px;
  color: var(--black);
}

.paper h1, .paper h2, .paper h3, .paper h4 { color: var(--black); }

/* 图片容器 */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(27, 51, 80, .92) 0%, rgba(10, 20, 40, .96) 100%);
  box-shadow: var(--shadow);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(143, 166, 196, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 166, 196, .07) 1px, transparent 1px);
  background-size: 28px 28px;
}

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  padding: 26px 14px 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--white);
  background: linear-gradient(180deg, rgba(10, 20, 40, 0) 0%, rgba(10, 20, 40, .9) 100%);
}

.media-frame--wide { aspect-ratio: 16 / 7; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--undecorated::after { display: none; }

/* =========================================================
   切换台基础协议（data-switch）
   ========================================================= */
[data-switch] { position: relative; }

.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tab {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(27, 51, 80, .5);
  color: var(--steel);
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.tab:hover { color: var(--white); border-color: var(--cyan); }

.tab[aria-selected="true"] {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--ink-900);
}

.tabpanel[hidden] { display: none; }

/* =========================================================
   错峰显现
   ========================================================= */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

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

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: 88px;
  border-top: 1px solid var(--line);
  background: var(--ink-800);
  color: var(--steel);
  font-size: 14px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: min(38%, 460px);
  height: 1px;
  background: linear-gradient(90deg, var(--yellow) 0%, var(--orange) 100%);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  padding-block: 56px 40px;
}

@media (min-width: 640px) {
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 960px) {
  .site-footer__grid {
    grid-template-columns: 1.5fr repeat(4, minmax(0, 1fr));
    gap: 26px;
  }
}

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

.site-footer__motto {
  margin-top: 16px;
  max-width: 30ch;
  font-family: var(--font-editorial);
  font-size: 16px;
  line-height: 1.9;
  color: rgba(242, 246, 255, .74);
}

.site-footer__edition {
  margin-top: 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--steel);
}

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

.footer-col__title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(44, 71, 103, .75);
  font-family: var(--font-display);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--white);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-col__link {
  display: inline-block;
  font-size: 13.5px;
  color: var(--steel);
  transition: color 160ms var(--ease), padding-left 180ms var(--ease);
}

.footer-col__link:hover {
  color: var(--yellow);
  padding-left: 5px;
}

.site-footer__contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding-block: 26px;
  border-top: 1px solid rgba(44, 71, 103, .6);
}

@media (min-width: 820px) {
  .site-footer__contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.contact-item__label {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .15em;
  color: var(--cyan);
}

.contact-item__value {
  font-family: var(--font-data);
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--white);
  word-break: break-word;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 22px;
  padding-block: 20px 42px;
  border-top: 1px solid rgba(44, 71, 103, .6);
}

.site-footer__legal,
.site-footer__note {
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--steel);
}

.site-footer__legal a {
  color: var(--steel);
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.site-footer__legal a:hover {
  color: var(--white);
  border-bottom-color: var(--cyan);
}

.site-footer__note { color: var(--ink-600); }

/* =========================================================
   降低动效偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }

  .js-reveal [data-reveal] {
    transform: none;
    transition: opacity 120ms linear;
  }

  .scroll-progress { transition: none; }
}