/* ============================================================
   四喜体育 CN · /assets/site.css
   共享外壳 + 通用组件（页面专属布局由页面 CSS 追加）
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html.has-nav-open { overflow: hidden; }
body, h1, h2, h3, h4, h5, p, ol, ul, dl, dd, figure, blockquote { margin: 0; }
ol, ul { list-style: none; padding: 0; }
img, svg, picture, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; }

:root {
  --ink-900: #07130F;
  --ink-700: #0E211B;
  --moss-500: #24483B;
  --paper-100: #F3EDDF;
  --paper-300: #D8CFB8;
  --orange-500: #FF6A1A;
  --orange-deep: #C2470A;
  --blue-400: #2FD0FF;
  --cream-50: #FFF8EC;
  --alert-500: #E5453F;

  --muted: rgba(216, 207, 184, .64);
  --grid-line: rgba(36, 72, 59, .65);

  --rail-w: 96px;
  --header-h: 64px;
  --maxw: 1240px;
  --gut: 24px;
  --ease: cubic-bezier(.3, .7, .2, 1);

  --font-display: "PingFang SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "IBM Plex Mono", Menlo, Consolas, monospace;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--cream-50);
  background-color: var(--ink-900);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

:focus-visible {
  outline: 2px solid var(--blue-400);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* ---------- skip link ---------- */
.skip-link {
  position: absolute;
  top: 0; left: 0;
  z-index: 200;
  transform: translateY(-120%);
  padding: 12px 18px;
  background: var(--orange-500);
  color: #1A0A02;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  border-radius: 0 0 2px 0;
  transition: transform .16s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ============================================================
   HEADER —— 移动端吸顶条 / 桌面端固定左轨
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: var(--header-h);
  padding: 0 16px;
  background: var(--ink-900);
  border-bottom: 1px solid var(--moss-500);
}

.rail-brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.rail-brand-link { display: inline-flex; align-items: baseline; gap: 5px; }
.rail-brand-mark {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1;
  color: var(--cream-50);
}
.rail-brand-cn {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--orange-500);
}
.rail-badge {
  display: none;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1.35;
  letter-spacing: .06em;
  color: var(--muted);
}
.rail-badge-dot {
  width: 5px; height: 5px;
  background: var(--blue-400);
  flex: none;
}

/* 移动端导航按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--moss-500);
  border-radius: 2px;
  color: var(--cream-50);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  transition: border-color .16s var(--ease), color .16s var(--ease);
}
.nav-toggle:hover { border-color: var(--orange-500); color: var(--orange-500); }
.nav-toggle-ico {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 18px;
  height: 14px;
}
.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform .18s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child { transform: translateY(3.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child { transform: translateY(-3.5px) rotate(-45deg); }
.nav-toggle-label { line-height: 1; }

/* 抽屉导航（移动端） */
.site-nav {
  position: fixed;
  top: var(--header-h);
  left: 0;
  bottom: 0;
  z-index: 55;
  width: min(330px, 88vw);
  display: flex;
  flex-direction: column;
  padding: 18px 18px 28px;
  background: var(--ink-700);
  border-right: 1px solid var(--moss-500);
  box-shadow: 24px 0 60px rgba(0, 0, 0, .55);
  overflow-y: auto;
  visibility: hidden;
  transform: translateX(-104%);
  transition: transform .22s var(--ease), visibility .22s var(--ease);
}
.site-nav[data-open] {
  visibility: visible;
  transform: translateX(0);
}

.nav-note {
  padding: 0 0 12px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--muted);
}
.nav-list { display: flex; flex-direction: column; }
.nav-item { border-bottom: 1px solid var(--grid-line); }
.nav-item:first-child { border-top: 1px solid var(--grid-line); }
.nav-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 4px;
  color: var(--paper-300);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  transition: color .16s var(--ease), background-color .16s var(--ease), border-color .16s var(--ease);
}
.nav-link:hover { color: var(--cream-50); }
.nav-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--moss-500);
  transition: color .16s var(--ease);
}
.nav-link:hover .nav-num { color: var(--blue-400); }
.nav-link[aria-current="page"] { color: var(--cream-50); }
.nav-link[aria-current="page"] .nav-num { color: var(--orange-500); }

.quick-entry {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 18px;
  padding: 10px 12px;
  border: 1px solid var(--orange-500);
  border-radius: 2px;
  color: var(--orange-500);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  transition: background-color .16s var(--ease), color .16s var(--ease);
}
.quick-entry:hover { background: var(--orange-500); color: #1A0A02; }

.rail-chapter {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--grid-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* 阅读进度 */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 90;
  display: block;
  height: 3px;
  background: var(--orange-500);
  transform: scaleX(var(--p, 0));
  transform-origin: 0 50%;
  will-change: transform;
  pointer-events: none;
}

/* ============================================================
   布局基件
   ============================================================ */
.site-main { display: block; min-height: 60vh; }

.wrap {
  width: min(100% - 40px, var(--maxw));
  margin-inline: auto;
}

.section {
  padding: clamp(48px, 7vw, 96px) 0;
  border-top: 1px solid var(--moss-500);
}
.section--tight { padding: clamp(32px, 4vw, 56px) 0; }
.section--paper {
  background: var(--paper-100);
  color: var(--ink-900);
  border-top: 1px solid var(--paper-300);
}
.section--paper .eyebrow,
.section--paper .section-number { color: var(--orange-deep); }
.section--paper .lede { color: rgba(7, 19, 15, .74); }
.section--paper .panel {
  background: #FBF6EA;
  border-color: var(--paper-300);
  color: var(--ink-900);
}
.section--paper .tag--home { color: var(--orange-deep); }
.section--paper .tag--away { color: #0A6E8A; }
.section--paper .index-row { border-bottom-color: var(--paper-300); }
.section--paper .index-meta { color: rgba(7, 19, 15, .56); }
.section--paper .btn-ghost { border-color: var(--paper-300); color: var(--ink-900); }
.section--paper .btn-ghost:hover { border-color: var(--orange-deep); color: var(--orange-deep); }

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

/* ============================================================
   排版
   ============================================================ */
.display-xl {
  font-family: var(--font-display);
  font-size: clamp(56px, 9vw, 132px);
  font-weight: 900;
  line-height: .9;
  letter-spacing: -.02em;
  color: var(--cream-50);
  word-break: break-word;
}
.display-l {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 76px);
  font-weight: 900;
  line-height: .96;
  letter-spacing: -.02em;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(24px, 2.6vw, 40px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.01em;
}
.eyebrow {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--orange-500);
}
.section-number {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--orange-500);
  transition: color .18s var(--ease);
}
.lede {
  max-width: 62ch;
  font-size: clamp(16px, 1.2vw, 18px);
  line-height: 1.75;
  color: var(--muted);
}
.prose { max-width: 62ch; }
.prose p { margin-bottom: 1em; line-height: 1.8; }
.prose p:last-child { margin-bottom: 0; }
.prose a {
  color: var(--blue-400);
  border-bottom: 1px solid rgba(47, 208, 255, .45);
}
.prose a:hover { border-bottom-color: var(--blue-400); }
.prose h3 { margin: 1.4em 0 .5em; font-size: 20px; font-weight: 800; }
.prose ul { list-style: none; }
.prose ul li { position: relative; padding-left: 18px; margin-bottom: .45em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0; top: .72em;
  width: 8px; height: 1px;
  background: var(--orange-500);
}

.num, .stat-value, .index-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

.note-vertical {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 12px;
  font-weight: 300;
  letter-spacing: .3em;
  line-height: 1;
  color: var(--muted);
}

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.2;
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease), transform .16s var(--ease);
}
.btn-primary { background: var(--orange-500); color: #1A0A02; }
.btn-primary:hover { background: #FF8642; transform: translateX(2px); }
.btn-ghost {
  border-color: var(--moss-500);
  color: var(--cream-50);
  background: transparent;
}
.btn-ghost:hover { border-color: var(--orange-500); color: var(--orange-500); }
.btn-sm { padding: 8px 14px; font-size: 12px; letter-spacing: .08em; }

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb { padding: 14px 0 0; }
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; }
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}
.breadcrumb li:not(:last-child)::after {
  content: "／";
  margin: 0 8px;
  color: var(--moss-500);
}
.breadcrumb a { color: var(--muted); border-bottom: 1px solid transparent; }
.breadcrumb a:hover { color: var(--blue-400); border-bottom-color: rgba(47, 208, 255, .5); }
.breadcrumb [aria-current="page"] { color: var(--cream-50); }

/* ============================================================
   面板 / 数据
   ============================================================ */
.panel {
  padding: 20px;
  background: var(--ink-700);
  border: 1px solid var(--moss-500);
  border-radius: 2px;
  transition: border-color .18s var(--ease), transform .18s var(--ease), background-color .18s var(--ease);
}
.panel:hover { border-color: var(--orange-500); transform: translateX(4px); }
.panel--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 20px) 100%, 0 100%);
}
.panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.stat-value {
  display: block;
  font-size: clamp(34px, 4.4vw, 68px);
  line-height: 1;
  color: var(--cream-50);
}
.stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border: 1px solid currentColor;
  border-radius: 2px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1.6;
  white-space: nowrap;
}
.tag--home { color: var(--orange-500); }
.tag--away { color: var(--blue-400); }
.tag--alert { color: var(--alert-500); }
.tag--plain { color: var(--muted); }

/* 索引列表 */
.index-list { border-top: 1px solid var(--moss-500); }
.index-row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--grid-line);
}
.index-num { font-size: 12px; color: var(--orange-500); letter-spacing: .08em; }
.index-title { font-size: 15px; font-weight: 700; color: var(--cream-50); }
.index-meta { font-size: 12px; letter-spacing: .06em; color: var(--muted); }

/* 章节高亮（JS 写入 data-active） */
[data-chapter] { position: relative; }
[data-chapter]::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 0;
  width: 2px;
  background: var(--orange-500);
  opacity: 0;
  transition: opacity .2s var(--ease);
}
[data-chapter][data-active]::before { opacity: 1; }
[data-chapter][data-active] .section-number { color: var(--orange-500); }

/* ============================================================
   图片容器基础（页面阶段放入真实图片）
   ============================================================ */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--moss-500);
  border-radius: 2px;
  background:
    linear-gradient(135deg, var(--ink-700) 0%, #0A1C16 58%, #12372B 100%);
  isolation: isolate;
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: .45;
  pointer-events: none;
}
.media img,
.media picture,
.media picture img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--wide { aspect-ratio: 16 / 9; }
.media--panorama { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media-caption {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}
.section--paper .media { border-color: var(--paper-300); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  padding: clamp(40px, 5vw, 64px) 0 28px;
  background: var(--ink-700);
  border-top: 1px solid var(--moss-500);
}
.footer-inner { width: min(100% - 40px, var(--maxw)); margin-inline: auto; }

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--moss-500);
}
.footer-brand-line {
  max-width: 22em;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 30px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--cream-50);
}
.footer-top .footer-brand-line::before {
  content: "";
  display: block;
  width: 44px;
  height: 3px;
  margin-bottom: 14px;
  background: var(--orange-500);
}
.footer-cta { flex: none; }

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--moss-500);
}
.footer-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--orange-500);
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 20px;
}
.footer-links a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--paper-300);
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.footer-links a:hover { color: var(--cream-50); border-bottom-color: var(--orange-500); }

.footer-contact-list { display: block; }
.footer-contact-row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--grid-line);
  font-size: 13px;
  line-height: 1.7;
}
.footer-contact-row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
  padding-top: 3px;
}
.footer-contact-row dd { color: var(--paper-300); word-break: break-word; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 22px;
}
.footer-note {
  max-width: 46ch;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}
.footer-icp { color: var(--paper-300); }

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 640px) {
  body { font-size: 17px; }
  .footer-grid { grid-template-columns: 1.1fr .9fr; gap: 40px; }
}

@media (max-width: 900px) {
  .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }
  .index-row { grid-template-columns: 32px minmax(0, 1fr); }
  .index-meta { grid-column: 2; }
}

@media (min-width: 1024px) {
  body {
    font-size: 17px;
    padding-left: var(--rail-w);
  }

  .site-header {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: var(--rail-w);
    min-height: 0;
    height: 100vh;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 16px 10px 14px;
    background: var(--ink-700);
    border-bottom: 0;
    border-right: 1px solid var(--moss-500);
  }

  .nav-toggle { display: none; }

  .rail-brand {
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--moss-500);
  }
  .rail-brand-link { flex-direction: column; align-items: center; gap: 8px; }
  .rail-brand-mark {
    writing-mode: vertical-rl;
    text-orientation: upright;
    font-size: 15px;
    letter-spacing: .16em;
    line-height: 1;
  }
  .rail-brand-cn { font-size: 10px; letter-spacing: .2em; }
  .rail-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-align: center;
    letter-spacing: .02em;
  }

  .site-nav {
    position: static;
    width: auto;
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    padding: 12px 0 0;
    background: transparent;
    border-right: 0;
    box-shadow: none;
    overflow-y: auto;
    visibility: visible;
    transform: none;
    transition: none;
  }
  .nav-note {
    padding: 0 0 10px;
    font-size: 10px;
    line-height: 1.5;
    letter-spacing: 0;
  }
  .nav-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    padding: 9px 6px 9px 9px;
    font-size: 13px;
    line-height: 1.35;
    letter-spacing: .02em;
    border-left: 2px solid transparent;
  }
  .nav-link:hover {
    background: rgba(47, 208, 255, .07);
    border-left-color: var(--blue-400);
  }
  .nav-link[aria-current="page"] {
    background: rgba(255, 106, 26, .12);
    border-left-color: var(--orange-500);
  }
  .nav-num { font-size: 9px; }

  .quick-entry {
    margin-top: 14px;
    padding: 9px 4px;
    font-size: 10px;
    letter-spacing: .02em;
    text-align: center;
    line-height: 1.3;
  }
  .rail-chapter {
    margin-top: 14px;
    padding-top: 10px;
    font-size: 9px;
    line-height: 1.5;
    letter-spacing: .02em;
  }

  .scroll-progress { left: var(--rail-w); }
}

@media (min-width: 1200px) {
  .footer-grid { grid-template-columns: 1.2fr .8fr; gap: 56px; }
}

/* ============================================================
   减少动效
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .site-nav { transition: none; }
  .panel:hover,
  .btn-primary:hover { transform: none; }
  .scroll-progress { transition: none; }
}