/* ==========================================================================
   FB赛事站 内地版 — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 刊头 / 页脚 / 通用组件
   ========================================================================== */

/* 1. 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, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
main { display: block; }

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

::selection { background: var(--cyan); color: #04100D; }

/* 2. 变量 ---------------------------------------------------------------- */
:root {
  --ink: #04100D;
  --panel: #0A211B;
  --line: #17382F;
  --edge: #2C5A4C;
  --cyan: #00F0C0;
  --cyan-soft: #8CFFE6;
  --orange: #FF4B21;
  --amber: #FFB627;
  --text: #E9F6F1;
  --text-2: #8FA9A1;
  --stripe: #12493B;

  --font-cn: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --wrap: 1280px;
  --gutter: clamp(18px, 4vw, 40px);
  --space-block: clamp(56px, 8vw, 96px);
  --gap: 24px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --header-approx: 150px;
}

/* 3. 基础排版 ------------------------------------------------------------ */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(23, 56, 47, .38) .5px, transparent .5px),
    linear-gradient(90deg, rgba(23, 56, 47, .38) .5px, transparent .5px);
  background-size: 48px 48px;
  color: var(--text);
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.05;
  color: var(--text);
}
h1 { font-size: clamp(38px, 7vw, 84px); }
h2 { font-size: clamp(28px, 4.2vw, 46px); }
h3 { font-size: clamp(20px, 2.4vw, 28px); line-height: 1.2; }
h4 { font-size: clamp(17px, 1.8vw, 20px); line-height: 1.3; }

p { max-width: 74ch; }
p + p { margin-top: 1.05em; }

.mono, .num {
  font-family: var(--font-mono);
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}
.lede { font-size: clamp(17px, 1.6vw, 20px); line-height: 1.75; color: var(--text-2); }
.muted { color: var(--text-2); }
.acc { color: var(--cyan); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* 4. 布局容器 ------------------------------------------------------------ */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: var(--space-block); }
.section--tight { padding-block: clamp(32px, 5vw, 56px); }
.stack > * + * { margin-top: var(--stack, 16px); }
.rule { height: .5px; border: 0; background: var(--line); }

.grid-8 {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: var(--gap);
}

/* 5. 章节头 / 通栏 / 标签 ------------------------------------------------ */
.section-head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: clamp(28px, 4vw, 48px);
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.sec-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  padding: 5px 10px;
  border: .5px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
}

.band {
  position: relative;
  background: var(--stripe);
  border-block: .5px solid var(--line);
}
.band--cyan { border-left: 4px solid var(--cyan); }
.band--signal { border-left: 4px solid var(--orange); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: .5px solid var(--edge);
  background: rgba(0, 240, 192, .06);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  white-space: nowrap;
}
.chip--alert { border-color: var(--orange); background: rgba(255, 75, 33, .1); color: var(--orange); }
.chip--amber { border-color: var(--amber); background: rgba(255, 182, 39, .08); color: var(--amber); }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }

/* 6. 按钮 ---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  border: .5px solid var(--edge);
  background: var(--panel);
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}
.btn:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-1px); }
.btn--primary { background: var(--cyan); border-color: var(--cyan); color: #04100D; }
.btn--primary:hover { background: var(--cyan-soft); border-color: var(--cyan-soft); color: #04100D; }
.btn--ghost { background: transparent; }
.btn--alert { background: var(--orange); border-color: var(--orange); color: #160500; }
.btn--alert:hover { background: #ff6b49; border-color: #ff6b49; color: #160500; }

/* 7. 卡片 / 数据 / 图片容器 --------------------------------------------- */
.card {
  position: relative;
  background: var(--panel);
  border: .5px solid var(--line);
  padding: clamp(18px, 2.4vw, 28px);
  transition: border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
}
.card:hover {
  border-color: var(--edge);
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, .38);
}
.card--cut { clip-path: polygon(0 0, 100% 0, 100% 88%, 92% 100%, 0 100%); }

.data-block {
  background: linear-gradient(180deg, rgba(0, 240, 192, .07), rgba(10, 33, 27, .92));
  border: .5px solid var(--line);
  border-left: 2px solid var(--cyan);
  padding: clamp(16px, 2vw, 24px);
}
.data-block .value {
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.6vw, 56px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}
.data-block .label {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--text-2);
}

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--panel);
  border: .5px solid var(--line);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(4, 16, 13, 0) 42%, rgba(4, 16, 13, .74));
  pointer-events: none;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--cut { clip-path: polygon(0 0, 100% 0, 100% 84%, 0 100%); }
.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--text-2);
}

/* 8. 面包屑 / 正文块 / 章节目录 ----------------------------------------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--text-2);
}
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "›"; color: var(--edge); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--text); }

.prose { max-width: 74ch; font-size: 16.5px; line-height: 1.85; color: var(--text); }
.prose h2, .prose h3 { margin-top: 1.8em; }
.prose ul, .prose ol { margin-top: 1.1em; display: flex; flex-direction: column; gap: 8px; }
.prose li { padding-left: 20px; position: relative; color: var(--text-2); }
.prose li::before { content: "—"; position: absolute; left: 0; color: var(--cyan); }

.toc {
  position: sticky;
  top: calc(var(--header-approx) + 20px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 18px;
  border-left: .5px solid var(--line);
}
.toc-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--text-2);
}
.toc a { font-size: 14px; color: var(--text-2); transition: color .18s var(--ease); }
.toc a:hover { color: var(--text); }
.toc a[aria-current="true"] { color: var(--cyan); font-weight: 700; }

/* 9. 刊头 ---------------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -64px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--cyan);
  color: #04100D;
  font-size: 14px;
  font-weight: 700;
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(4, 16, 13, .95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: .5px solid var(--line);
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--edge), transparent);
  opacity: .7;
  pointer-events: none;
}

.scroll-progress {
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 2px;
  pointer-events: none;
}
.scroll-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  transition: width .12s linear;
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 18px;
  padding-block: 20px;
  transition: padding .24s var(--ease);
}
.masthead-side { display: flex; align-items: center; gap: 12px; }
.masthead-side--start { justify-self: start; }
.masthead-side--end { justify-self: end; }

.quick-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: .5px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--text-2);
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}
.quick-link::before { content: "⌕"; color: var(--cyan); font-size: 14px; }
.quick-link:hover {
  color: var(--text);
  border-color: var(--cyan);
  background: rgba(0, 240, 192, .06);
}

.brand {
  justify-self: center;
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--text);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.02em;
  transition: font-size .24s var(--ease);
}
.brand-mark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: .86em;
  letter-spacing: .04em;
  color: var(--cyan);
}
.brand-sub {
  align-self: center;
  padding-left: 10px;
  border-left: .5px solid var(--edge);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .24em;
  color: var(--text-2);
}

.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: .5px solid var(--edge);
  background: rgba(10, 33, 27, .72);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  white-space: nowrap;
}
.version-badge-tag { color: var(--cyan); font-weight: 600; }
.version-badge-text { color: var(--text-2); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: .5px solid var(--line);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background-color .2s var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform .2s var(--ease), top .2s var(--ease);
}
.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }

.site-nav {
  border-top: .5px solid var(--line);
  background: rgba(10, 33, 27, .55);
}
.nav-list {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: clamp(6px, 1.8vw, 30px);
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.nav-list a {
  position: relative;
  display: block;
  padding: 13px 6px 12px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--text-2);
  transition: color .18s var(--ease);
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 6px; right: 6px; bottom: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .22s var(--ease);
}
.nav-list a:hover { color: var(--text); }
.nav-list a:hover::after { transform: scaleX(1); }
.nav-list a[aria-current="page"] { color: var(--text); }
.nav-list a[aria-current="page"]::after { transform: scaleX(1); }

.site-header[data-compact] .masthead { padding-block: 10px; }
.site-header[data-compact] .brand { font-size: clamp(20px, 2.1vw, 24px); }
.site-header[data-compact] .nav-list a { padding-block: 9px 8px; font-size: 13.5px; }

/* 10. 页脚 --------------------------------------------------------------- */
.site-footer {
  margin-top: clamp(64px, 10vw, 120px);
  background-color: #051410;
  background-image:
    linear-gradient(rgba(23, 56, 47, .6) .5px, transparent .5px),
    linear-gradient(90deg, rgba(23, 56, 47, .6) .5px, transparent .5px);
  background-size: 48px 48px;
  border-top: .5px solid var(--edge);
  color: var(--text-2);
  font-size: 14.5px;
}
.footer-strip {
  height: 5px;
  background: linear-gradient(90deg,
    var(--cyan) 0 22%,
    var(--amber) 22% 25%,
    var(--orange) 25% 28%,
    var(--edge) 28% 100%);
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-block: clamp(40px, 6vw, 72px) clamp(32px, 4vw, 52px);
}
.footer-brand-name {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--text);
}
.footer-intro { margin-top: 14px; max-width: 44ch; line-height: 1.8; color: var(--text-2); }
.footer-sign {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--cyan);
}
.footer-col-title {
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: .5px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--text);
}
.footer-link-list { display: flex; flex-direction: column; gap: 10px; }
.footer-link-list a {
  color: var(--text-2);
  font-size: 14.5px;
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}
.footer-link-list a:hover { color: var(--cyan); padding-left: 4px; }
.footer-base {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  padding-block: 22px;
  border-top: .5px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--text-2);
}
.footer-base-item { max-width: none; margin: 0; }

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 14px;
  background: rgba(10, 33, 27, .94);
  border: .5px solid var(--edge);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s linear, border-color .2s var(--ease), color .2s var(--ease);
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--cyan); color: var(--cyan); }

/* 11. 显现动效 ----------------------------------------------------------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s var(--ease) var(--reveal-delay, 0s), transform .55s var(--ease) var(--reveal-delay, 0s);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }

/* 12. 响应式 ------------------------------------------------------------- */
@media (max-width: 900px) {
  .grid-8 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
  .toc { position: static; }
}

@media (max-width: 860px) {
  .site-header { position: sticky; }
  .masthead {
    grid-template-columns: auto 1fr auto;
    gap: 12px;
    padding-block: 14px;
  }
  .masthead-side--start { display: none; }
  .masthead-side--end { grid-column: 1; grid-row: 1; justify-self: start; }
  .brand { grid-column: 2; grid-row: 1; justify-self: center; font-size: 22px; }
  .nav-toggle { display: inline-flex; grid-column: 3; grid-row: 1; justify-self: end; }
  .version-badge-text { display: none; }

  .site-nav {
    position: absolute;
    left: 0; right: 0; top: 100%;
    max-height: 0;
    overflow: hidden;
    border-top: 0;
    background: #071813;
    transition: max-height .28s var(--ease);
  }
  .site-nav[data-open] {
    max-height: 74vh;
    overflow-y: auto;
    border-top: .5px solid var(--edge);
    box-shadow: 0 20px 44px rgba(0, 0, 0, .55);
  }
  .nav-list {
    flex-direction: column;
    justify-content: flex-start;
    gap: 0;
    padding: 8px var(--gutter) 22px;
  }
  .nav-list a {
    padding: 14px 12px;
    font-size: 16px;
    border-bottom: .5px solid var(--line);
  }
  .nav-list a::after { display: none; }
  .nav-list a[aria-current="page"] {
    color: var(--cyan);
    box-shadow: inset 3px 0 0 var(--cyan);
  }
  .site-header[data-compact] .masthead { padding-block: 10px; }
  .site-header[data-compact] .nav-list a { padding-block: 14px; font-size: 16px; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-base { flex-direction: column; gap: 6px; }
  .to-top { padding: 10px 12px; }
}

@media (max-width: 560px) {
  .grid-8 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .brand-sub { display: none; }
}

/* 13. 动效降级 ----------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress span { transition: none; }
}