/* ============================================================
   三亿体育赛场 — /assets/site.css
   共享层：reset、变量、中文排版、头部、页脚、按钮、面包屑、
   内容容器、栅格与基础组件
   ============================================================ */

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

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

body,
h1, h2, h3, h4, h5, p, ul, ol, li, figure, figcaption,
blockquote, dl, dd, table { margin: 0; padding: 0; }

ul, ol { list-style: none; }

a { color: inherit; text-decoration: none; }

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

input, textarea, select { font: inherit; }

/* ---------- 变量 ---------- */
:root {
  --ink-900: #06120E;
  --ink-800: #0B1F19;
  --turf-700: #12312A;
  --line-600: #1E463C;
  --paper-100: #F4F7F2;
  --mist-300: #A8C0B5;
  --mist-500: #7A958B;
  --cyan-400: #46F2C8;
  --cyan-ink: #04231C;
  --orange-500: #FF7A33;
  --amber-300: #FFC46B;

  --font-display: 'Bebas Neue', 'Oswald', 'Source Han Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Source Han Sans SC', 'PingFang SC', 'HarmonyOS Sans SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --step--1: 13px;
  --step-0: 15px;
  --step-1: 19px;
  --step-2: clamp(24px, 3vw, 34px);
  --step-3: clamp(38px, 5vw, 64px);
  --step-4: clamp(52px, 7vw, 104px);

  --gap: clamp(16px, 2vw, 24px);
  --pad-x: clamp(16px, 4vw, 56px);
  --radius-a: 32px 8px 32px 8px;
  --radius-b: 8px 32px 8px 32px;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 基础与中文排版 ---------- */
html, body { min-height: 100%; }

body {
  background-color: var(--ink-900);
  color: var(--paper-100);
  font-family: var(--font-body);
  font-size: var(--step-0);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.01em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

::selection { background: var(--cyan-400); color: var(--cyan-ink); }

:focus-visible {
  outline: 2px solid var(--orange-500);
  outline-offset: 3px;
  border-radius: 4px;
}

#main-content { display: block; }
#main-content:focus { outline: none; }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 300;
  padding: 12px 22px;
  background: var(--cyan-400);
  color: var(--cyan-ink);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: .08em;
  border-radius: 0 0 14px 0;
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 0; }

/* ---------- 容器与栅格 ---------- */
.wrap {
  width: 100%;
  max-width: 1360px;
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line-600);
}

/* 上层品牌条 */
.brand-strip {
  background: var(--ink-800);
  border-bottom: 1px solid rgba(30, 70, 60, .75);
  max-height: 48px;
  overflow: hidden;
  opacity: 1;
  transition: max-height .3s var(--ease), opacity .3s var(--ease);
}
.site-header.is-condensed .brand-strip {
  max-height: 0;
  opacity: 0;
}

.brand-strip__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  min-height: 46px;
  font-size: 12px;
  color: var(--mist-500);
}

.brand-strip__sig {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist-300);
  white-space: nowrap;
}

.sig-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange-500);
  box-shadow: 0 0 0 3px rgba(255, 122, 51, .18);
}

.strip-link {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--paper-100);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.strip-link:hover { color: var(--cyan-400); border-bottom-color: var(--cyan-400); }

.strip-ticker {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: hidden;
}

.strip-ticker__label {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan-400);
  white-space: nowrap;
  padding-right: 12px;
  border-right: 1px solid var(--line-600);
}

.strip-ticker__track {
  display: flex;
  width: max-content;
  animation: tickerScroll 40s linear infinite;
}
.strip-ticker:hover .strip-ticker__track { animation-play-state: paused; }

.strip-ticker__group {
  display: flex;
  gap: 28px;
  padding-right: 28px;
}
.strip-ticker__group span {
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist-500);
}

.strip-tools {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
  white-space: nowrap;
}
.strip-tool {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist-500);
  transition: color .18s var(--ease);
}
.strip-tool:hover { color: var(--paper-100); }
.strip-tool--mobile {
  color: var(--cyan-400);
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(70, 242, 200, .45);
}
.strip-tool--mobile:hover { color: var(--paper-100); border-bottom-color: var(--paper-100); }

@keyframes tickerScroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* 下层栏目条 */
.nav-bar { background: var(--ink-900); }

.nav-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 40px);
  min-height: 72px;
  transition: min-height .3s var(--ease);
}
.site-header.is-condensed .nav-bar__inner { min-height: 54px; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}
.brand__mark {
  width: 22px;
  height: 22px;
  border-radius: 8px 2px 8px 2px;
  background: linear-gradient(140deg, var(--cyan-400) 0%, var(--cyan-400) 55%, var(--orange-500) 55%, var(--orange-500) 100%);
  transition: transform .18s var(--ease);
}
.brand:hover .brand__mark { transform: rotate(-6deg) scale(1.06); }

.brand__text { display: grid; gap: 1px; }
.brand__cn {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--paper-100);
  line-height: 1.2;
}
.brand__en {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .3em;
  color: var(--mist-500);
  line-height: 1.2;
}

.nav {
  flex: 1 1 auto;
  min-width: 0;
}
.nav__list {
  display: flex;
  align-items: stretch;
  gap: 2px;
  overflow: visible;
}
.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 12px 14px;
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--mist-300);
  white-space: nowrap;
  background: transparent;
  transition: color .18s var(--ease), background-color .18s var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--cyan-400);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}
.nav__link:hover {
  color: var(--paper-100);
  background: var(--turf-700);
}
.nav__link:hover::after,
.nav__link[aria-current="page"]::after { transform: scaleX(1); }
.nav__link[aria-current="page"] {
  color: var(--paper-100);
  background: rgba(18, 49, 42, .55);
}

.nav-cta { flex: 0 0 auto; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 13px;
  border: 1px solid var(--line-600);
  border-radius: 12px 3px 12px 3px;
  color: var(--paper-100);
  font-size: 13px;
  letter-spacing: .12em;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan-400); color: var(--cyan-400); }
.nav-toggle[aria-expanded="true"] {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
}
.nav-toggle__bars { display: grid; gap: 4px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) 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(-6px) rotate(-45deg); }

/* 阅读进度 */
.scroll-meter {
  height: 2px;
  background: var(--line-600);
  overflow: hidden;
}
.scroll-meter__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan-400), var(--orange-500));
  transition: transform .1s linear;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .08em;
  line-height: 1.4;
  border: 1px solid transparent;
  border-radius: 999px 6px 999px 6px;
  transition: background-color .18s var(--ease), color .18s var(--ease),
              border-color .18s var(--ease), transform .18s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--orange-500);
  color: var(--ink-900);
  border-color: var(--orange-500);
}
.btn--primary:hover { background: var(--paper-100); border-color: var(--paper-100); }

.btn--cyan {
  background: var(--cyan-400);
  color: var(--cyan-ink);
  border-color: var(--cyan-400);
}
.btn--cyan:hover { background: var(--paper-100); border-color: var(--paper-100); }

.btn--ghost {
  background: transparent;
  color: var(--paper-100);
  border-color: var(--line-600);
}
.btn--ghost:hover { color: var(--cyan-400); border-color: var(--cyan-400); }

/* ---------- 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist-500);
}
.crumbs li { display: inline-flex; align-items: center; }
.crumbs li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--line-600);
}
.crumbs a { color: var(--mist-500); transition: color .18s var(--ease); }
.crumbs a:hover { color: var(--cyan-400); }
.crumbs [aria-current="page"] { color: var(--mist-300); }

/* ---------- 章节与正文容器 ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.section-head {
  display: grid;
  gap: 10px;
  max-width: 62ch;
}
.section-head h2 {
  font-size: var(--step-2);
  color: var(--paper-100);
}
.section-head p {
  color: var(--mist-300);
  font-size: var(--step-0);
}

.prose { max-width: 68ch; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  margin-top: 2em;
  font-size: var(--step-2);
  color: var(--paper-100);
}
.prose h3 {
  margin-top: 1.8em;
  font-size: var(--step-1);
  color: var(--paper-100);
}
.prose p, .prose li { color: var(--mist-300); }
.prose ul, .prose ol { padding-left: 1.2em; }
.prose ul li { list-style: square; }
.prose ol li { list-style: decimal; }
.prose li + li { margin-top: .5em; }
.prose strong { color: var(--paper-100); font-weight: 500; }
.prose a {
  color: var(--cyan-400);
  border-bottom: 1px solid rgba(70, 242, 200, .4);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.prose a:hover { color: var(--paper-100); border-bottom-color: var(--paper-100); }

.divider {
  height: 1px;
  border: 0;
  background: var(--line-600);
  margin-block: clamp(28px, 4vw, 56px);
}

/* ---------- 数据组件 ---------- */
.stat { display: grid; gap: 6px; }
.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan-400);
}
.stat__label {
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist-500);
}

.num-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

/* ---------- 卡片、标签、时间轴 ---------- */
.panel {
  background: var(--turf-700);
  border: 1px solid var(--line-600);
  border-radius: var(--radius-a);
  padding: clamp(20px, 3vw, 34px);
  transition: transform .18s var(--ease), border-color .18s var(--ease);
}
.panel:hover {
  transform: translateY(-2px);
  border-color: rgba(70, 242, 200, .55);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan-400);
  border: 1px solid rgba(70, 242, 200, .45);
  border-radius: 999px 3px 999px 3px;
}
.tag--live {
  color: var(--ink-900);
  background: var(--orange-500);
  border-color: var(--orange-500);
}

.time-rail {
  position: relative;
  padding-left: 22px;
}
.time-rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-600);
}
.time-rail__item {
  position: relative;
  padding-block: 10px;
  color: var(--mist-300);
}
.time-rail__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan-400);
  transition: transform .18s var(--ease), background-color .18s var(--ease);
}
.time-rail__item:hover::before {
  background: var(--cyan-400);
  transform: scale(1.45);
}

/* ---------- 图片容器基础规则 ---------- */
.figure { display: grid; gap: 10px; }

.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-600);
  border-radius: var(--radius-a);
  background:
    radial-gradient(circle at 78% 16%, rgba(70, 242, 200, .16), transparent 58%),
    linear-gradient(150deg, var(--turf-700) 0%, var(--ink-800) 62%, var(--ink-900) 100%);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.figure__cap {
  font-size: var(--step--1);
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--mist-500);
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: clamp(56px, 9vw, 128px);
  background: var(--ink-800);
  border-top: 1px solid var(--line-600);
  color: var(--mist-300);
}

.footer__inner { padding-block: clamp(32px, 5vw, 64px) clamp(24px, 3vw, 40px); }

.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.mobile-entry {
  position: relative;
  display: grid;
  gap: 10px;
  padding: clamp(22px, 3vw, 34px);
  background: var(--cyan-400);
  color: var(--cyan-ink);
  border-radius: var(--radius-b);
  transition: background-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}
.mobile-entry:hover {
  background: var(--paper-100);
  transform: translateY(-2px);
}
.mobile-entry__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  text-transform: uppercase;
}
.mobile-entry__title {
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.01em;
}
.mobile-entry__note {
  font-size: 13px;
  line-height: 1.7;
  max-width: 34ch;
}
.mobile-entry__arrow {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  transition: transform .2s var(--ease);
}
.mobile-entry:hover .mobile-entry__arrow { transform: translateX(6px); }

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

.footer__col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--mist-500);
  margin-bottom: 14px;
}

.footer__links { display: grid; gap: 10px; }
.footer__links a {
  display: inline-block;
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--mist-300);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.footer__links a:hover {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.footer__meta {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line-600);
  display: grid;
  gap: 8px;
}
.footer__brand {
  font-size: 15px;
  letter-spacing: .12em;
  color: var(--paper-100);
}
.footer__contact {
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: .03em;
  color: var(--mist-500);
  max-width: 92ch;
}
.footer__legal {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist-500);
}

.footer-ticker {
  border-top: 1px solid var(--line-600);
  overflow: hidden;
  padding-block: 10px;
  background: var(--ink-900);
}
.footer-ticker__track {
  display: flex;
  width: max-content;
  animation: tickerScroll 40s linear infinite;
}
.footer-ticker:hover .footer-ticker__track { animation-play-state: paused; }
.footer-ticker__group {
  display: flex;
  gap: 34px;
  padding-right: 34px;
}
.footer-ticker__group span {
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist-500);
}

/* ---------- 平板 ---------- */
@media (max-width: 1024px) {
  .span-3, .span-4 { grid-column: span 6; }
  .span-5, .span-7 { grid-column: span 12; }
  .footer__top { grid-template-columns: minmax(0, 1fr); }
  .strip-ticker__group { gap: 22px; padding-right: 22px; }
}

/* ---------- 手机 ---------- */
@media (max-width: 860px) {
  .brand-strip__sig { font-size: 11px; letter-spacing: .08em; }
  .strip-ticker { display: none; }

  .nav-bar__inner {
    flex-wrap: wrap;
    min-height: 62px;
    padding-block: 8px;
    gap: 8px 14px;
  }
  .site-header.is-condensed .nav-bar__inner { min-height: 54px; }

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

  .nav {
    order: 3;
    flex: 0 0 100%;
    border-top: 1px solid var(--line-600);
    border-bottom: 1px solid transparent;
  }
  .nav__list {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding-block: 6px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .nav__list::-webkit-scrollbar { display: none; }
  .nav__link { padding: 10px 12px; font-size: 14px; }

  .nav[data-open="true"] {
    border-bottom-color: var(--line-600);
    background: var(--ink-800);
  }
  .nav[data-open="true"] .nav__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px;
    overflow: visible;
    padding-block: 8px 12px;
    animation: navDrop .2s var(--ease);
  }
  .nav[data-open="true"] .nav__link {
    width: 100%;
    justify-content: flex-start;
    border: 1px solid var(--line-600);
    border-radius: 12px 3px 12px 3px;
  }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 6; }

  .footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 16px; }
  .footer__legal { letter-spacing: .06em; }
}

@keyframes navDrop {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 480px) {
  .brand__cn { font-size: 15px; }
  .brand__en { letter-spacing: .22em; }
  .footer__cols { grid-template-columns: minmax(0, 1fr); }
  .mobile-entry__title { font-size: 26px; }
}

/* ---------- 减动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .strip-ticker__track,
  .footer-ticker__track { animation: none !important; }
  .btn:hover,
  .panel:hover,
  .mobile-entry:hover { transform: none; }
  .scroll-meter__bar { transition: none; }
}