/* =========================================================
   a8体育站 · 共享样式 / assets/site.css
   赛场指挥室 × 数据仪表盘 · 目录型内容地图
   ========================================================= */

/* 1 · 设计令牌 */
:root {
  --ink: #0B2F26;
  --ink-2: #103D31;
  --graphite: #06130F;
  --cyan: #2EF2C8;
  --cyan-soft: #9FFFE8;
  --amber: #FFB347;
  --paper: #F4EFE3;
  --mute: #8FA9A1;
  --red: #E5484D;
  --yellow: #F5C518;
  --line: rgba(143, 169, 161, .24);
  --line-strong: rgba(143, 169, 161, .46);
  --max: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 3px;
  --font-display: "Arial Narrow", "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Songti SC", "SimSun", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;
}

/* 2 · reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { line-height: 1.14; }
p { text-wrap: pretty; }

/* 3 · 基础版式 */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: clamp(15px, .5vw + 13.8px, 17px);
  line-height: 1.78;
  letter-spacing: .012em;
  overflow-wrap: break-word;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(46, 242, 200, .04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 242, 200, .04) 1px, transparent 1px);
  background-size: 88px 88px;
}
::selection { background: var(--cyan); color: #04241C; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 2px; }

/* 4 · 布局 */
.wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.site-main { position: relative; z-index: 1; flex: 1 1 auto; }

/* 5 · 跳至主内容 */
.skip-link {
  position: fixed;
  left: 12px;
  top: -80px;
  z-index: 220;
  padding: 11px 18px;
  background: var(--amber);
  color: #2A1500;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .12em;
  transition: top .18s ease;
}
.skip-link:focus { top: 12px; }

/* 6 · 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 22px 40px -34px rgba(0, 0, 0, .95);
}
.site-header__rail {
  background: var(--graphite);
  border-bottom: 1px solid rgba(143, 169, 161, .16);
}
.site-header__rail-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 3vw, 32px);
  min-height: 54px;
  padding-block: 9px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand__mark {
  padding: 3px 7px;
  background: var(--cyan);
  color: var(--graphite);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: .78rem;
  line-height: 1.1;
  letter-spacing: .06em;
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 1.5vw, 1.26rem);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--paper);
}
.brand__tag {
  margin-left: 4px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
  font-family: var(--font-sans);
  font-size: .7rem;
  letter-spacing: .28em;
  color: var(--mute);
  text-transform: uppercase;
}
.rail-note {
  font-family: var(--font-sans);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--mute);
  text-align: right;
}
.site-header__deck { background: var(--ink); }
.site-header__deck-inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  min-height: 58px;
}
.deck-label {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  font-family: var(--font-sans);
  font-size: .66rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--mute);
  white-space: nowrap;
}
.deck-label::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--cyan);
  display: block;
}
.nav { flex: 1 1 auto; }
.nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 2px;
  counter-reset: navidx;
}
.nav__list > li { counter-increment: navidx; display: flex; }
.nav__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 16px 14px;
  font-family: var(--font-sans);
  font-size: .86rem;
  letter-spacing: .16em;
  color: rgba(244, 239, 227, .78);
  border-bottom: 2px solid transparent;
  transition: color .16s ease, background .16s ease, border-color .16s ease;
}
.nav__list a::before {
  content: counter(navidx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: 0;
  color: var(--mute);
}
.nav__list a:hover { color: var(--cyan-soft); background: rgba(46, 242, 200, .07); }
.nav__list a[aria-current="page"] {
  color: var(--paper);
  border-bottom-color: var(--amber);
}
.nav__list a[aria-current="page"]::before { color: var(--amber); }
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(46, 242, 200, .06);
  color: var(--cyan-soft);
  font-family: var(--font-sans);
  font-size: .74rem;
  letter-spacing: .2em;
}
.nav-toggle__bars { position: relative; display: block; width: 16px; height: 10px; }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] { background: var(--cyan); color: var(--graphite); border-color: var(--cyan); }
.site-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(143, 169, 161, .16);
  overflow: hidden;
}
.site-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  transition: width .12s linear;
}

/* 7 · 页脚 */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: auto;
  background: var(--graphite);
  border-top: 1px solid var(--line);
  color: var(--paper);
}
.site-footer__top {
  padding-block: clamp(34px, 5.5vw, 64px);
  border-bottom: 1px solid var(--line);
}
.site-footer__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1.55fr) minmax(0, 1.05fr);
}
.footer-brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--paper);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--amber);
  display: inline-block;
}
.footer-brand__intro {
  margin-top: 14px;
  max-width: 40ch;
  font-size: .95rem;
  color: rgba(244, 239, 227, .76);
}
.footer-brand__stamp { margin-top: 18px; }
.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}
.footer-nav__title {
  font-family: var(--font-sans);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--cyan);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.footer-nav__list { display: grid; gap: 9px; }
.footer-nav__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: .84rem;
  letter-spacing: .08em;
  color: rgba(244, 239, 227, .74);
  transition: color .16s ease, transform .16s ease;
}
.footer-nav__list a::before {
  content: "";
  width: 6px;
  height: 1px;
  background: var(--mute);
  transition: background .16s ease, width .16s ease;
}
.footer-nav__list a:hover { color: var(--cyan-soft); transform: translateX(2px); }
.footer-nav__list a:hover::before { width: 12px; background: var(--cyan); }
.footer-contact__list { display: grid; gap: 12px; }
.footer-contact__list li { display: grid; gap: 2px; }
.footer-contact__key {
  font-family: var(--font-sans);
  font-size: .66rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--mute);
}
.footer-contact__val {
  font-family: var(--font-mono);
  font-size: .84rem;
  letter-spacing: .02em;
  color: var(--paper);
}
.footer-contact__note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
  font-size: .84rem;
  color: rgba(143, 169, 161, .92);
}
.site-footer__base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 20px;
  font-family: var(--font-sans);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--mute);
}
.footer-legal { color: rgba(244, 239, 227, .74); }
.footer-meta { color: var(--mute); }

/* 8 · 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(244, 239, 227, .04);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  transition: background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.btn:hover { border-color: var(--cyan); color: var(--cyan-soft); background: rgba(46, 242, 200, .1); transform: translateY(-1px); }
.btn--amber { background: var(--amber); border-color: var(--amber); color: #231402; }
.btn--amber:hover { background: var(--cyan-soft); border-color: var(--cyan-soft); color: #04241C; }
.btn--ghost { background: transparent; }

/* 9 · 面包屑 */
.crumbs { padding-block: 14px; border-bottom: 1px solid var(--line); }
.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mute);
}
.crumbs__list li + li::before { content: "/"; margin-right: 8px; color: rgba(143, 169, 161, .6); }
.crumbs__list a:hover { color: var(--cyan); }
.crumbs__list [aria-current="page"] { color: var(--paper); }

/* 10 · 页头文字系统 */
.page-head { padding-block: clamp(32px, 6vw, 72px) clamp(18px, 3vw, 34px); }
.kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-sans);
  font-size: .7rem;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--cyan);
}
.kicker::before { content: ""; width: 28px; height: 1px; background: var(--cyan); }
.display-title {
  margin-top: 18px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.3rem, 6.4vw, 4.7rem);
  line-height: .99;
  letter-spacing: .02em;
  text-transform: uppercase;
  color: var(--paper);
}
.display-title em { font-style: normal; color: var(--amber); }
.lede {
  max-width: 62ch;
  margin-top: 20px;
  font-size: 1.04rem;
  color: rgba(244, 239, 227, .82);
}
.meta-line {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--mute);
}

/* 11 · 章节 */
.section { padding-block: clamp(28px, 5vw, 62px); }
.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 18px;
  padding-bottom: 14px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
  border-bottom: 1px solid var(--line);
}
.section__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.45rem, 3vw, 2.15rem);
  line-height: 1.05;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--paper);
}
.divider { height: 1px; border: 0; background: var(--line); margin-block: clamp(24px, 4vw, 48px); }

/* 12 · 面板与卡片 */
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 16px;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.panel__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--paper);
}
.panel--paper {
  background: var(--paper);
  color: #12211C;
  border-color: rgba(6, 19, 15, .2);
  box-shadow: 0 18px 34px -28px rgba(0, 0, 0, .9);
}
.panel--paper .panel__head { border-bottom-color: rgba(6, 19, 15, .16); }
.panel--paper .panel__title { color: #0B2F26; }
.panel--paper .meta-line,
.panel--paper .text-mute { color: #4A5F58; }
.card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(16px, 2vw, 22px);
  background: linear-gradient(180deg, var(--ink-2), var(--ink));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .18s ease, transform .18s ease;
}
.card:hover { border-color: rgba(46, 242, 200, .5); transform: translateY(-2px); }
.card__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.08rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--paper);
}
.card__text { font-size: .94rem; color: rgba(244, 239, 227, .76); }
.card__stat {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1.1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

/* 13 · 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--mute);
  font-family: var(--font-sans);
  font-size: .66rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  white-space: nowrap;
}
.tag--cyan { background: var(--cyan); border-color: var(--cyan); color: #04241C; }
.tag--amber { background: var(--amber); border-color: var(--amber); color: #2A1500; }
.tag--outline-cyan { border-color: rgba(46, 242, 200, .55); color: var(--cyan); }
.tag--red { background: var(--red); border-color: var(--red); color: #fff; }
.tag--yellow { background: var(--yellow); border-color: var(--yellow); color: #2A2300; }

/* 14 · 网格 */
.grid { display: grid; gap: clamp(16px, 2.4vw, 30px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, .85fr) minmax(0, 1.6fr); }

/* 15 · 图片容器（页面阶段放图） */
.figure { margin: 0; }
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(46, 242, 200, .09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 242, 200, .09) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: .55;
}
.media__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media__tag { position: absolute; left: 12px; top: 12px; z-index: 2; }
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 4 / 5; }
.media--tall { aspect-ratio: 3 / 4; }
.media__caption {
  margin-top: 8px;
  font-family: var(--font-sans);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mute);
}

/* 16 · 可访问标签页 */
.tabs { margin-block: clamp(20px, 3vw, 34px); }
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-bottom: 1px solid var(--line);
}
.tabs__tab {
  margin-bottom: -1px;
  padding: 12px 16px;
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  border-radius: 2px 2px 0 0;
  color: var(--mute);
  font-family: var(--font-sans);
  font-size: .74rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  transition: color .16s ease, background .16s ease, border-color .16s ease;
}
.tabs__tab:hover { color: var(--cyan-soft); }
.tabs__tab[aria-selected="true"] {
  color: var(--paper);
  background: var(--ink-2);
  border-color: var(--line);
  border-bottom-color: var(--amber);
}
.tabs__panel { padding-top: clamp(16px, 2.4vw, 26px); }
.tabs__panel[hidden] { display: none; }

/* 17 · 目录型索引列表 */
.index-list {
  counter-reset: idx;
  border-top: 1px solid var(--line);
}
.index-list__item { counter-increment: idx; border-bottom: 1px solid var(--line); }
.index-list__item > a {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px 18px;
  padding: 16px 6px;
  transition: background .16s ease, padding-left .16s ease;
}
.index-list__item > a::before {
  content: counter(idx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--amber);
}
.index-list__item > a:hover { background: rgba(46, 242, 200, .06); padding-left: 14px; }
.index-list__title {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--paper);
}
.index-list__note { display: block; margin-top: 4px; font-size: .9rem; color: rgba(244, 239, 227, .72); }
.index-list__meta { font-family: var(--font-mono); font-size: .72rem; color: var(--mute); }

/* 18 · 工具类与动效 */
.stack > * + * { margin-top: 18px; }
.measure { max-width: 68ch; }
.text-mute { color: var(--mute); }
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: .04em; }
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s ease;
}
[data-reveal].is-in { opacity: 1; transform: none; }
.to-top {
  position: fixed;
  right: clamp(14px, 2.4vw, 28px);
  bottom: clamp(14px, 2.4vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: rgba(6, 19, 15, .94);
  color: var(--cyan-soft);
  font-family: var(--font-sans);
  font-size: .7rem;
  letter-spacing: .2em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease, border-color .2s ease;
}
.to-top.is-on { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--cyan); }

/* 19 · 响应式 */
@media (max-width: 1040px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--split { grid-template-columns: minmax(0, 1fr); }
  .site-footer__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 900px) {
  .rail-note { display: none; }
}
@media (max-width: 860px) {
  .site-header__deck-inner { flex-wrap: wrap; padding-block: 0; row-gap: 0; }
  .deck-label { padding-block: 16px; }
  .nav {
    order: 3;
    flex: 1 0 100%;
    display: none;
    margin-top: 0;
    border-top: 1px solid var(--line);
  }
  .site-header[data-open] .nav { display: block; }
  .nav__list { flex-direction: column; flex-wrap: nowrap; gap: 0; padding-block: 4px; }
  .nav__list > li { width: 100%; }
  .nav__list a {
    width: 100%;
    padding: 13px 2px;
    font-size: .9rem;
    border-bottom: 1px solid rgba(143, 169, 161, .16);
  }
  .nav__list a[aria-current="page"] { border-bottom-color: var(--amber); }
  .nav-toggle { display: inline-flex; margin-block: 11px; }
}
@media (max-width: 680px) {
  .grid--2, .grid--3, .grid--split { grid-template-columns: minmax(0, 1fr); }
  .brand__tag { display: none; }
  .site-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .index-list__item > a { grid-template-columns: 40px minmax(0, 1fr); }
  .index-list__meta { grid-column: 2; }
  .tabs__list { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .tabs__tab { white-space: nowrap; }
}

/* 20 · 动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .site-progress__bar { transition: none !important; }
}