/* ============================================================
   AOA体育官网 · 共享样式 /assets/site.css
   墨蓝档案室底色 + 奶油纸面插页 + 电光青数据 + 亮橙优先线
   ============================================================ */

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

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

ul, ol { list-style: none; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 128px;
  -webkit-text-size-adjust: 100%;
}

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

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

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

table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-950: #08131F;
  --ink-900: #0E2033;
  --ink-800: #17344C;
  --cream-100: #F2EADA;
  --cream-200: #DCCFB6;
  --cyan-400: #3FE3D2;
  --cyan-700: #12756E;
  --orange-500: #FF7A33;
  --amber-300: #F0B44C;
  --slate-400: #93A7B8;
  --paper-000: #FBF8F2;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-board: "Archivo Narrow", "Oswald", "Arial Narrow", "PingFang SC", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap-max: 1280px;
  --wrap-max-wide: 1760px;
  --gap: 24px;
  --step: 96px;
  --cut: 10px;
  --header-h: 100px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink-950);
  color: var(--paper-000);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: .01em;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: .01em;
}

h1 { font-size: clamp(2.75rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.75rem, 3.4vw, 2.25rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

p { max-width: 72ch; }

.mono,
code,
kbd,
samp {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

::selection { background: var(--cyan-400); color: var(--ink-950); }

/* ---------- 4. 布局容器 ---------- */
.wrap {
  width: min(100% - 32px, var(--wrap-max));
  margin-inline: auto;
}

@media (min-width: 1440px) {
  .wrap { width: min(100% - 64px, var(--wrap-max-wide)); }
}

html[data-view="board"] .wrap {
  width: min(100% - 64px, var(--wrap-max-wide));
}

.grid {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.cols-12 {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.col-span-4 { grid-column: span 4; }
.col-span-6 { grid-column: span 6; }
.col-span-8 { grid-column: span 8; }
.col-span-12 { grid-column: span 12; }

@media (max-width: 1023px) {
  .col-span-4, .col-span-6, .col-span-8 { grid-column: span 12; }
}

/* ---------- 5. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 22px;
  font-family: var(--font-board);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
  transition: background-color 180ms var(--ease), color 180ms var(--ease), transform 180ms var(--ease);
}

.btn--primary {
  background-color: var(--orange-500);
  color: var(--ink-950);
}

.btn--primary:hover { background-color: var(--amber-300); }

.btn--ghost {
  background-color: transparent;
  color: var(--paper-000);
  box-shadow: inset 0 0 0 1px var(--ink-800);
}

.btn--ghost:hover {
  box-shadow: inset 0 0 0 1px var(--cyan-400);
  color: var(--cyan-400);
}

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

/* ---------- 6. 面板 / 纸面 ---------- */
.cut-panel {
  position: relative;
  background-color: var(--ink-900);
  padding: clamp(20px, 3vw, 32px);
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.cut-panel:hover {
  transform: translateY(-2px);
  box-shadow: inset 0 0 0 1px var(--cyan-400), 0 12px 32px rgba(8, 19, 31, .55);
}

.paper {
  background-color: var(--cream-100);
  background-image:
    linear-gradient(rgba(23, 52, 76, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 52, 76, .07) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--ink-950);
}

.paper h1, .paper h2, .paper h3, .paper h4 { color: var(--ink-950); }
.paper .ts, .paper .stat__label { color: #5A6B7B; }

/* ---------- 7. 编辑式元素 ---------- */
.eyebrow {
  font-family: var(--font-board);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber-300);
}

.chapter {
  display: flex;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
}

.chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
}

.chapter__title { font-family: var(--font-display); }

.rule-diagonal {
  height: 2px;
  border: 0;
  background: linear-gradient(90deg, var(--cyan-400), var(--cyan-700) 45%, transparent 85%);
  transform: skewY(-1.2deg);
  transform-origin: left center;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-400);
  font-variant-numeric: tabular-nums;
}

.stat__label {
  font-family: var(--font-board);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--slate-400);
}

.stat.is-flag .stat__value { color: var(--orange-500); }

.ts {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--slate-400);
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--font-board);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--amber-300);
  box-shadow: inset 0 0 0 1px rgba(240, 180, 76, .5);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  padding: 18px 0;
  font-family: var(--font-board);
  font-size: 13px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--slate-400);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--ink-800);
}

.breadcrumb__item a:hover { color: var(--cyan-400); }
.breadcrumb__item[aria-current="page"] { color: var(--paper-000); }

/* ---------- 9. 正文容器 ---------- */
.prose {
  max-width: 70ch;
  font-size: 17px;
  line-height: 1.75;
}

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

.prose h2,
.prose h3 { margin-top: 1.9em; }

.prose ul,
.prose ol { padding-left: 1.25em; }

.prose ul li { list-style: none; position: relative; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: -1.1em;
  top: .72em;
  width: 8px;
  height: 2px;
  background-color: var(--cyan-400);
}

.prose blockquote {
  padding-left: 20px;
  border-left: 2px solid var(--orange-500);
  font-family: var(--font-display);
  font-size: 1.125rem;
}

.prose a {
  color: var(--cyan-400);
  box-shadow: inset 0 -1px 0 currentColor;
}

/* ---------- 10. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background-color: var(--ink-900);
  box-shadow: inset 0 0 0 1px var(--ink-800);
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
  aspect-ratio: 16 / 9;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame > img,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(1.04);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--paper-000);
  background: linear-gradient(180deg, transparent, rgba(8, 19, 31, .88));
}

/* ---------- 11. 锚点索引 ---------- */
.anchor-index {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 0;
  font-family: var(--font-board);
  font-size: 13px;
  letter-spacing: .06em;
}

.anchor-index__link {
  padding: 6px 12px;
  color: var(--slate-400);
  box-shadow: inset 0 0 0 1px var(--ink-800);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
  transition: color 150ms var(--ease), box-shadow 150ms var(--ease);
}

.anchor-index__link:hover { color: var(--cyan-400); }

.anchor-index__link.is-active {
  color: var(--ink-950);
  background-color: var(--cyan-400);
  box-shadow: none;
}

/* ---------- 12. skip link ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -120px;
  z-index: 100;
  padding: 10px 18px;
  font-family: var(--font-board);
  font-size: 14px;
  letter-spacing: .08em;
  background-color: var(--cyan-400);
  color: var(--ink-950);
  transition: top 160ms var(--ease);
}

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

/* ---------- 13. 头部：双层信息导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--ink-950);
  border-bottom: 1px solid var(--ink-800);
}

.header-strip {
  background-color: var(--ink-900);
  background-image: linear-gradient(90deg, rgba(18, 117, 110, .34), transparent 58%);
  border-bottom: 1px solid var(--ink-800);
}

.header-strip__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 40px;
  font-size: 12.5px;
  color: var(--slate-400);
}

.header-strip__signature {
  font-family: var(--font-board);
  letter-spacing: .07em;
  color: var(--cream-200);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-strip__status {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate-400);
  white-space: nowrap;
}

.header-strip__status .mono { color: var(--cyan-400); }

.header-strip__utility {
  display: flex;
  align-items: center;
  gap: 10px;
}

.util-link {
  position: relative;
  font-family: var(--font-board);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--cyan-400);
  box-shadow: inset 0 -1px 0 rgba(63, 227, 210, .4);
  transition: color 150ms var(--ease), box-shadow 150ms var(--ease);
}

.util-link:hover {
  color: var(--paper-000);
  box-shadow: inset 0 -1px 0 var(--paper-000);
}

.util-btn {
  padding: 5px 12px;
  font-family: var(--font-board);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--cream-200);
  background-color: var(--ink-800);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
  transition: background-color 150ms var(--ease), color 150ms var(--ease);
}

.util-btn:hover { background-color: var(--cyan-700); color: var(--paper-000); }

.util-btn[aria-pressed="true"] {
  background-color: var(--cyan-400);
  color: var(--ink-950);
}

.header-nav { position: relative; }

.header-nav__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 60px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 5px 10px 5px 8px;
  font-family: var(--font-board);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--ink-950);
  background-color: var(--cyan-400);
  clip-path: polygon(0 0, 100% 0, 86% 100%, 0 100%);
}

.brand__text {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper-000);
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

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

.nav__link {
  display: block;
  padding: 10px 13px;
  font-family: var(--font-board);
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--slate-400);
  box-shadow: inset 0 -2px 0 transparent;
  transition: color 150ms var(--ease), box-shadow 150ms var(--ease);
}

.nav__link:hover { color: var(--paper-000); }

.nav__link[aria-current="page"] {
  color: var(--paper-000);
  box-shadow: inset 0 -2px 0 var(--cyan-400);
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  margin-left: 10px;
  padding: 0 16px;
  font-family: var(--font-board);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--ink-950);
  background-color: var(--orange-500);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: background-color 180ms var(--ease), transform 180ms var(--ease);
}

.nav__cta:hover { background-color: var(--amber-300); transform: translateY(-2px); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 46px;
  height: 40px;
  margin-left: auto;
  padding: 0 10px;
  background-color: var(--ink-900);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--cyan-400);
  transition: transform 180ms var(--ease), opacity 180ms var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: var(--step);
  background-color: var(--ink-900);
  border-top: 1px solid var(--ink-800);
  color: var(--slate-400);
  font-size: 15px;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--orange-500), var(--cyan-400) 40%, transparent 90%);
  transform: skewY(-.6deg);
  transform-origin: left center;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(230px, 1.5fr) repeat(3, minmax(130px, 1fr));
  gap: 32px;
  padding: 64px 0 40px;
}

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

.footer-brand__line {
  font-family: var(--font-board);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--cream-200);
  max-width: 26ch;
}

.footer-closing {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--cyan-400);
}

.footer-col { display: flex; flex-direction: column; gap: 14px; }

.footer-col__title {
  font-family: var(--font-board);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber-300);
}

.footer-list { display: flex; flex-direction: column; gap: 8px; }

.footer-list a {
  font-size: 15px;
  color: var(--slate-400);
  box-shadow: inset 0 -1px 0 transparent;
  transition: color 150ms var(--ease), box-shadow 150ms var(--ease);
}

.footer-list a:hover {
  color: var(--paper-000);
  box-shadow: inset 0 -1px 0 var(--cyan-400);
}

.footer-note {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 32px;
  padding: 22px 0;
  border-top: 1px solid var(--ink-800);
  font-size: 14px;
}

.footer-note__hours { font-family: var(--font-mono); font-size: 13px; color: #6B7F91; }

.footer-contact { padding: 4px 0 22px; }

.footer-contact__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 34px;
}

.footer-contact__item {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  color: var(--cream-200);
}

.footer-contact__label {
  font-family: var(--font-board);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--slate-400);
}

.footer-contact .mono { color: var(--cyan-400); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0 40px;
  border-top: 1px solid var(--ink-800);
}

.footer-legal { font-size: 13px; color: var(--slate-400); }

.to-top {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  font-family: var(--font-board);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan-400);
  box-shadow: inset 0 0 0 1px var(--ink-800);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: color 150ms var(--ease), box-shadow 150ms var(--ease);
}

.to-top:hover {
  color: var(--ink-950);
  background-color: var(--cyan-400);
  box-shadow: none;
}

/* ---------- 15. 滚动进度与显现 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 60;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan-400), var(--orange-500));
  pointer-events: none;
}

.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 16. 焦点可见 ---------- */
:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
  border-radius: 2px;
}

.paper :focus-visible { outline-color: var(--ink-950); }

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1023px) {
  .header-strip__status { display: none; }
  .footer-top {
    grid-template-columns: minmax(220px, 1.4fr) repeat(2, minmax(120px, 1fr));
    padding: 48px 0 32px;
  }
}

@media (max-width: 899px) {
  :root { --step: 56px; }

  .header-strip__inner { min-height: 38px; gap: 12px; font-size: 12px; }
  .header-strip__signature { max-width: 58%; }

  .header-nav__inner { min-height: 58px; }

  .nav-toggle { display: flex; }

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 12px 16px 20px;
    background-color: var(--ink-950);
    border-bottom: 1px solid var(--ink-800);
    box-shadow: 0 18px 36px rgba(8, 19, 31, .7);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 180ms var(--ease), transform 180ms var(--ease), visibility 180ms var(--ease);
  }

  .nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav__link {
    padding: 13px 4px;
    font-size: 16px;
    box-shadow: inset 0 -1px 0 var(--ink-800);
  }

  .nav__link[aria-current="page"] { box-shadow: inset 0 -1px 0 var(--ink-800), inset 4px 0 0 var(--cyan-400); padding-left: 12px; }

  .nav__cta {
    justify-content: center;
    margin: 16px 0 0;
    min-height: 46px;
    font-size: 15px;
  }

  .footer-contact__list { flex-direction: column; gap: 8px; }
}

@media (max-width: 599px) {
  body { font-size: 16px; }

  .header-strip__signature { max-width: 100%; font-size: 11.5px; }
  .header-strip__utility { gap: 8px; }
  .brand__text { font-size: 17px; }

  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }

  .cols-12 > [class*="col-span"] { grid-column: span 12; }
}

/* ---------- 18. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .reveal { opacity: 1; transform: none; }
  .cut-panel:hover { transform: none; }
  .nav__cta:hover { transform: none; }
}