/* ============================================================
   B体育赛场 — 全站共享样式 /assets/site.css
   1. Reset  2. Variables  3. Base & 中文排版  4. Utilities
   5. Header 6. Footer 7. Responsive 8. Motion
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}
body {
  min-height: 100vh;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
ul, ol { list-style: none; padding: 0; }
table { border-collapse: collapse; width: 100%; }
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}
:focus-visible {
  outline: 2px solid var(--platform);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 2. Variables ---------- */
:root {
  /* 夜班通勤色板 */
  --ink: #0E1B2A;
  --ink-card: #16283C;
  --ink-deep: #091320;
  --platform: #F2B705;
  --lamp: #FFD65C;
  --signal: #3DDC97;
  --brick: #D1495B;
  --brick-deep: #B03A4A;
  --paper: #F4F1EA;
  --paper-dim: #E3DED2;
  --steel: #8FA3B8;
  --line: #2C4056;

  /* 字体 */
  --font-display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --fs-tiny: 12px;
  --fs-small: 14px;
  --fs-body: 16px;
  --fs-lead: 18px;
  --fs-h3: 24px;
  --fs-h2: 32px;
  --fs-h1: 44px;
  --fs-hero: 64px;

  /* 间距（8px 基线） */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;
  --sp-9: 96px;

  /* 容器 */
  --wrap: 1200px;
  --gutter: clamp(16px, 4vw, 40px);

  /* 动效 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur-1: 180ms;
  --dur-2: 240ms;
  --dur-3: 320ms;

  /* 形状 */
  --radius-s: 6px;
  --radius-m: 14px;
  --radius-l: 26px;
}

/* ---------- 3. Base & 中文排版 ---------- */
body {
  background-image:
    radial-gradient(1100px 520px at 82% -8%, rgba(242, 183, 5, 0.07), transparent 62%),
    radial-gradient(860px 460px at 4% 4%, rgba(61, 220, 151, 0.05), transparent 60%);
  background-repeat: no-repeat;
  background-attachment: fixed;
}
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; }
strong, b { font-weight: 700; color: var(--paper); }
small { font-size: var(--fs-tiny); color: var(--steel); }
hr {
  border: 0;
  height: 1px;
  background: var(--line);
  margin-block: var(--sp-6);
}
::selection {
  background: var(--platform);
  color: var(--ink-deep);
}

/* ---------- 4. Utilities ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--sp-8); }

.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  z-index: 300;
  transform: translate(-50%, -160%);
  background: var(--platform);
  color: var(--ink-deep);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 10px 20px;
  border-radius: 0 0 var(--radius-m) var(--radius-m);
  text-decoration: none;
  transition: transform var(--dur-1) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  outline-offset: -4px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  line-height: 1.2;
  transition:
    background-color var(--dur-1) var(--ease),
    color var(--dur-1) var(--ease),
    border-color var(--dur-1) var(--ease),
    transform var(--dur-1) var(--ease);
}
.btn--primary {
  background: var(--platform);
  color: var(--ink-deep);
}
.btn--primary:hover { background: var(--lamp); transform: translateY(-1px); }
.btn--ghost {
  border-color: var(--line);
  color: var(--paper);
}
.btn--ghost:hover {
  border-color: var(--lamp);
  color: var(--lamp);
  background: rgba(255, 214, 92, 0.07);
}
.btn--signal {
  border-color: rgba(61, 220, 151, 0.55);
  color: var(--signal);
}
.btn--signal:hover {
  background: rgba(61, 220, 151, 0.12);
  border-color: var(--signal);
}

/* 面包屑 */
.breadcrumb {
  font-size: var(--fs-small);
  color: var(--steel);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.breadcrumb li + li::before {
  content: "";
  display: block;
  width: 14px;
  height: 1px;
  background: var(--line);
}
.breadcrumb a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}
.breadcrumb a:hover { color: var(--lamp); border-bottom-color: var(--lamp); }
.breadcrumb [aria-current="page"] { color: var(--paper); font-weight: 700; }

/* 长文正文 */
.prose {
  max-width: 44em;
  color: var(--paper-dim);
  font-size: var(--fs-body);
  line-height: 1.78;
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  margin-top: 2em;
  font-size: var(--fs-h3);
  color: var(--paper);
}
.prose h3 {
  margin-top: 1.7em;
  font-size: var(--fs-lead);
  color: var(--lamp);
  letter-spacing: 0;
}
.prose ul { list-style: none; margin-top: 1em; }
.prose li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 0.55em;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--platform);
}
.prose a {
  color: var(--lamp);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 214, 92, 0.4);
  transition: border-color var(--dur-1) var(--ease);
}
.prose a:hover { border-bottom-color: var(--lamp); }
.prose blockquote {
  border-left: 2px solid var(--platform);
  padding-left: var(--sp-4);
  color: var(--steel);
}

/* 栅格 */
.grid { display: grid; gap: var(--sp-5); }
.grid--split { grid-template-columns: minmax(0, 38fr) minmax(0, 62fr); }
.grid--half { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* 可复用图片容器 */
.media-frame {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(242, 183, 5, 0.16), transparent 58%),
    linear-gradient(162deg, var(--ink-card), var(--ink-deep));
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) brightness(0.94);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(244, 241, 234, 0.09) 1px, transparent 1px);
  background-size: 4px 4px;
  opacity: 0.35;
  mix-blend-mode: screen;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* 眉标 / 标签 / 数字 */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-tiny);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--steel);
  text-transform: uppercase;
}
.kicker::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--platform);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: var(--fs-tiny);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--steel);
  line-height: 1.7;
}
.tag--signal {
  color: var(--signal);
  border-color: rgba(61, 220, 151, 0.45);
  background: rgba(61, 220, 151, 0.1);
}
.tag--brick {
  color: #F5DDE0;
  border-color: rgba(209, 73, 91, 0.62);
  background: rgba(209, 73, 91, 0.26);
}
.tag--platform {
  color: var(--ink-deep);
  background: var(--platform);
  border-color: var(--platform);
}

.num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.card {
  background: var(--ink-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: var(--sp-5);
}

.offset-a { margin-top: 8px; }
.offset-b { margin-top: 20px; }

/* 内容显现（由 site.js 启用） */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity var(--dur-2) var(--ease),
    transform var(--dur-2) var(--ease);
}
.js-reveal [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 5. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  color: var(--paper);
  background: rgba(14, 27, 42, 0.94);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .site-header { background: var(--ink); }
}

.site-header__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  z-index: 2;
  display: block;
  width: 100%;
  height: 2px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--platform) 0%, var(--lamp) 44%, var(--signal) 100%);
  transform: scaleX(var(--progress, 0));
  transform-origin: 0 50%;
  transition: transform 120ms linear;
}

.site-header__inner {
  position: relative;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 14px var(--gutter) 6px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  grid-template-areas:
    "line masthead status"
    "nav  nav      nav";
  align-items: center;
  row-gap: 2px;
  column-gap: var(--sp-4);
  transition: padding-block var(--dur-2) var(--ease);
}
.site-header[data-condensed="true"] .site-header__inner {
  padding-block: 8px 4px;
}

.site-header__line {
  grid-area: line;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  letter-spacing: 0.09em;
  color: var(--steel);
  white-space: nowrap;
}
.site-header__line-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brick);
  flex: none;
}

/* 报头 */
.masthead {
  grid-area: masthead;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 2px 12px;
  text-decoration: none;
  color: var(--paper);
}
.masthead__name {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.3vw, 30px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  font-stretch: 90%;
  transition: color var(--dur-1) var(--ease);
}
.masthead:hover .masthead__name { color: var(--lamp); }
.masthead__tag {
  font-size: var(--fs-tiny);
  letter-spacing: 0.1em;
  color: var(--steel);
  line-height: 1.5;
  transition: opacity var(--dur-2) var(--ease);
}
.site-header[data-condensed="true"] .masthead__tag { opacity: 0.55; }

/* 移动导航开关 */
.nav-toggle {
  grid-area: toggle;
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(22, 40, 60, 0.62);
  color: var(--paper);
  font-size: var(--fs-tiny);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1;
  transition:
    border-color var(--dur-1) var(--ease),
    background-color var(--dur-1) var(--ease);
}
.nav-toggle:hover { border-color: var(--lamp); background: var(--ink-card); }
.nav-toggle__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--platform);
  box-shadow: 0 0 0 3px rgba(242, 183, 5, 0.16);
  flex: none;
  transition:
    background-color var(--dur-1) var(--ease),
    box-shadow var(--dur-1) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__dot {
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(61, 220, 151, 0.18);
}

/* 状态行 */
.site-header__status {
  grid-area: status;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  font-size: var(--fs-tiny);
  letter-spacing: 0.04em;
  color: var(--steel);
  white-space: nowrap;
}
.status__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(61, 220, 151, 0.18);
  flex: none;
}
.status__date {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0;
  color: var(--paper-dim);
}
.status__text { color: var(--steel); }

@keyframes status-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(61, 220, 151, 0.18); }
  50% { box-shadow: 0 0 0 6px rgba(61, 220, 151, 0.05); }
}
@media (prefers-reduced-motion: no-preference) {
  .status__dot { animation: status-pulse 3s var(--ease) infinite; }
}

/* 站点式导航 */
.site-nav {
  grid-area: nav;
  display: flex;
  justify-content: center;
  min-width: 0;
}
.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-width: 0;
}
.site-nav__item { min-width: 0; }
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border-radius: 999px;
  font-size: var(--fs-small);
  color: var(--steel);
  text-decoration: none;
  white-space: nowrap;
  transition:
    color var(--dur-1) var(--ease),
    background-color var(--dur-1) var(--ease);
}
.site-nav__link::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--line);
  flex: none;
  transition:
    background-color var(--dur-1) var(--ease),
    box-shadow var(--dur-1) var(--ease),
    transform var(--dur-1) var(--ease);
}
.site-nav__link:hover {
  color: var(--paper);
  background: var(--ink-card);
}
.site-nav__link:hover::before {
  background: var(--lamp);
  transform: scale(1.4);
}
.site-nav__link[aria-current="page"] {
  color: var(--paper);
  background: rgba(242, 183, 5, 0.1);
}
.site-nav__link[aria-current="page"]::before {
  background: var(--platform);
  box-shadow: 0 0 0 4px rgba(242, 183, 5, 0.16);
}
.site-nav__link:focus-visible {
  outline: 2px solid var(--platform);
  outline-offset: 2px;
}

/* ---------- 6. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: var(--sp-9);
  padding-block: var(--sp-8) var(--sp-6);
  background: var(--ink-deep);
  color: var(--steel);
  font-size: var(--fs-small);
  line-height: 1.75;
  border-top: 1px solid var(--line);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--brick) 0 22%,
    var(--platform) 22% 58%,
    var(--signal) 58% 100%
  );
  opacity: 0.6;
}
.site-footer::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(244, 241, 234, 0.06) 1px, transparent 1px);
  background-size: 5px 5px;
  opacity: 0.4;
}
.site-footer__inner {
  position: relative;
  z-index: 1;
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr 1.35fr 1fr;
  gap: var(--sp-6) var(--sp-5);
  align-items: start;
}

.footer-col { min-width: 0; }
.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--sp-3);
  font-size: var(--fs-tiny);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--paper);
}
.footer-col__title::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--platform);
  flex: none;
}
.footer-col__list li + li { margin-top: 8px; }
.footer-col__list a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--steel);
  text-decoration: none;
  transition: color var(--dur-1) var(--ease);
}
.footer-col__list a::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line);
  flex: none;
  transition: background-color var(--dur-1) var(--ease);
}
.footer-col__list a:hover { color: var(--lamp); }
.footer-col__list a:hover::before { background: var(--platform); }

.footer-brand {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
  text-decoration: none;
  transition: color var(--dur-1) var(--ease);
}
.footer-brand:hover { color: var(--lamp); }
.footer-brand__tag {
  margin-top: 6px;
  font-size: var(--fs-small);
  color: var(--steel);
  line-height: 1.7;
  max-width: 22em;
}
.footer-brand__icp {
  margin-top: var(--sp-4);
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  letter-spacing: 0.04em;
  color: rgba(143, 163, 184, 0.85);
}

.footer-contact {
  margin-top: var(--sp-4);
  padding-top: var(--sp-4);
  border-top: 1px solid rgba(44, 64, 86, 0.8);
  font-style: normal;
  font-size: var(--fs-tiny);
  line-height: 2;
  color: var(--steel);
}
.footer-contact span { display: block; }

.footer-note {
  margin-top: var(--sp-4);
  font-size: var(--fs-tiny);
  line-height: 1.8;
  color: rgba(143, 163, 184, 0.85);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2) var(--sp-5);
  margin-top: var(--sp-7);
  padding-top: var(--sp-4);
  border-top: 1px solid rgba(44, 64, 86, 0.75);
  font-size: var(--fs-tiny);
  color: var(--steel);
}
.footer-icp {
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  color: var(--paper-dim);
}

/* ---------- 7. Responsive ---------- */
@media (max-width: 1080px) {
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--thirds { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 880px) {
  html { scroll-padding-top: 168px; }

  .site-header__inner {
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-areas:
      "line  masthead toggle"
      "nav   nav      nav"
      "status status   status";
    padding: 12px var(--gutter) 10px;
    row-gap: 0;
    column-gap: var(--sp-3);
  }
  .site-header[data-condensed="true"] .site-header__inner {
    padding-block: 10px 8px;
  }
  .nav-toggle { display: inline-flex; }
  .masthead {
    align-items: flex-start;
    padding: 0;
  }
  .masthead__tag { display: none; }
  .masthead__name { font-size: 24px; }
  .site-header__status {
    justify-content: flex-start;
    margin-top: 8px;
    padding-top: 10px;
    border-top: 1px solid var(--line);
  }
  .site-nav {
    justify-content: flex-start;
    padding-top: 10px;
  }
  .site-nav__list {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .site-nav__list::-webkit-scrollbar { display: none; }
  .site-nav[data-open="false"] { display: none; }
  .site-nav__link { padding: 8px 13px; }

  .grid--split,
  .grid--half { grid-template-columns: minmax(0, 1fr); }
  .section { padding-block: var(--sp-7); }
}

@media (max-width: 620px) {
  html { scroll-padding-top: 152px; }

  .site-header__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "masthead toggle"
      "nav      nav"
      "status   status";
  }
  .site-header__line { display: none; }
  .masthead__name { font-size: 22px; }
  .site-nav__link { font-size: 13px; padding: 8px 11px; }

  .site-footer { padding-block: var(--sp-7) var(--sp-5); margin-top: var(--sp-8); }
  .site-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .site-footer__legal { flex-direction: column; align-items: flex-start; }

  .grid--thirds { grid-template-columns: minmax(0, 1fr); }
  .card { padding: var(--sp-4); }
}

/* ---------- 8. Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .js-reveal [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
  .site-header__progress { transition: none; }
}