/* ============================================================
   BSPORTS 赛场 — 共享样式 /assets/site.css
   0 reset · 1 令牌 · 2 排版 · 3 容器与网格 · 4 按钮与标签
   5 页头 · 6 页脚 · 7 通用组件 · 8 动效与可访问性 · 9 响应式
   ============================================================ */

/* 0. reset ------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body, h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

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

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; padding: 0; cursor: pointer; }

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

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

[hidden] { display: none !important; }

/* 1. 设计令牌 ---------------------------------------------- */
:root {
  --ink: #0B1E1A;
  --char: #111518;
  --deep: #1C3A33;
  --cyan: #2FE3C8;
  --orange: #FF7A29;
  --white: #F4F8F7;
  --gray: #9FB2AE;
  --mint: #A9F2E5;
  --sand: #FFD9BE;
  --slate: #5C6B70;

  --line: rgba(47, 227, 200, 0.18);
  --line-soft: rgba(244, 248, 247, 0.12);
  --grid-line: rgba(47, 227, 200, 0.055);
  --ink-on-accent: #1B1003;

  --font-display: "Archivo Narrow", "Oswald", "Arial Narrow", "Noto Sans SC", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 1240px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 3px;
  --bar-h: 76px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --shadow: 0 22px 48px -30px rgba(0, 0, 0, 0.95);
}

/* 2. 基础排版 ---------------------------------------------- */
body {
  min-height: 100%;
  background-color: var(--ink);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--cyan); color: #06201B; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.005em;
}

h1 { font-size: clamp(2rem, 4.6vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.4rem); }
h4 { font-size: 1.05rem; }

p + p { margin-top: 0.9em; }

strong { font-weight: 500; color: var(--mint); }

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

/* 3. 容器与网格 -------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-top { padding-top: clamp(7rem, 16vh, 9.5rem); }

.section { padding: clamp(2.75rem, 7vw, 5.5rem) 0; }

.section-head { max-width: 64ch; margin-bottom: clamp(1.5rem, 3vw, 2.5rem); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 11.5px;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.75;
}

.section-title { margin-top: 0.55rem; }

.lede {
  margin-top: 0.9rem;
  max-width: 46ch;
  color: var(--gray);
}

.grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.5rem);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--rail { grid-template-columns: minmax(0, 3fr) minmax(0, 1fr); }

.aside-note {
  border-left: 2px solid var(--cyan);
  padding: 0.2rem 0 0.2rem 1rem;
  color: var(--gray);
  font-size: 14px;
  line-height: 1.7;
}

/* 4. 按钮与标签 -------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.1rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 12.5px;
  font-weight: 700;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary { background: var(--orange); color: var(--ink-on-accent); }
.btn--primary:hover { background: var(--sand); }

.btn--ghost {
  color: var(--mint);
  border-color: var(--line);
  background: rgba(47, 227, 200, 0.04);
}

.btn--ghost:hover { border-color: var(--cyan); color: var(--white); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.55rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--mint);
  background: rgba(47, 227, 200, 0.06);
}

.tag--orange {
  color: var(--sand);
  border-color: rgba(255, 122, 41, 0.42);
  background: rgba(255, 122, 41, 0.1);
}

.tag--muted {
  color: var(--slate);
  border-color: var(--line-soft);
  background: transparent;
}

/* 5. 页头 -------------------------------------------------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  color: var(--white);
  background: linear-gradient(180deg, rgba(11, 30, 26, 0.94), rgba(11, 30, 26, 0));
  transition: background-color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.site-header[data-scrolled="true"],
.site-header[data-nav-open="true"] {
  background: var(--ink);
  background-image: none;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 16px 34px -30px #000;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4.5rem;
  z-index: 90;
  padding: 0.6rem 1rem;
  background: var(--orange);
  color: var(--ink-on-accent);
  font-family: var(--font-display);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 12px;
  border-radius: 2px;
  transition: top 0.18s var(--ease);
}

.skip-link:focus { top: 0.6rem; }

.header-utility {
  overflow: hidden;
  max-height: 60px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11.5px;
  color: var(--gray);
  transition: max-height 0.24s var(--ease), opacity 0.18s var(--ease);
}

.site-header[data-scrolled="true"] .header-utility {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.header-utility__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 36px;
}

.header-utility__note { color: var(--mint); white-space: nowrap; }

.utility-list {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.utility-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
}

.utility-item::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  opacity: 0.85;
}

.utility-item:nth-child(2)::before { background: var(--mint); opacity: 0.6; }
.utility-item:nth-child(3)::before { background: var(--orange); }

.header-bar__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: var(--bar-h);
  transition: min-height 0.24s var(--ease);
}

.site-header[data-scrolled="true"] .header-bar__inner { min-height: 64px; }

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding-left: 0.7rem;
  position: relative;
  font-family: var(--font-display);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.14em;
  white-space: nowrap;
}

.brand::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15em;
  bottom: 0.1em;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
}

.brand__mark { font-size: 20px; color: var(--white); }
.brand__cn { font-size: 13px; letter-spacing: 0.3em; color: var(--cyan); }

.site-nav { margin-left: auto; }

.nav-list { display: flex; align-items: center; gap: 0.15rem; }

.nav-item { position: relative; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.72rem;
  font-size: 15px;
  color: var(--gray);
  border-radius: 2px;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.nav-link:hover { color: var(--mint); background: rgba(47, 227, 200, 0.07); }

.nav-link[aria-current="page"] { color: var(--white); }

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0.72rem;
  right: 0.72rem;
  bottom: 0.18rem;
  height: 2px;
  background: var(--orange);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: 1rem;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11.5px;
  color: var(--mint);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.header-progress {
  height: 2px;
  width: 100%;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  opacity: 0.9;
  transition: opacity 0.2s var(--ease);
}

.site-header[data-scrolled="false"] .header-progress { opacity: 0; }

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(6, 16, 14, 0.74);
}

/* 6. 页脚 -------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  background: var(--char);
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 8px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(47, 227, 200, 0.38) 0 1px,
    transparent 1px 24px
  );
  opacity: 0.6;
  pointer-events: none;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(0, 2.4fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding: clamp(2.75rem, 6vw, 4.25rem) 0 clamp(2rem, 4vw, 3rem);
}

.footer-brand__mark {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 21px;
  color: var(--white);
}

.footer-brand__line {
  margin: 0.65rem 0 1.3rem;
  max-width: 26ch;
  color: var(--gray);
  font-size: 15px;
  line-height: 1.7;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.5rem;
}

.footer-col__title {
  margin-bottom: 0.95rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12px;
  color: var(--cyan);
}

.footer-list li + li { margin-top: 0.55rem; }

.footer-list a {
  display: inline-block;
  font-size: 15px;
  color: var(--gray);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-list a:hover { color: var(--white); border-bottom-color: var(--cyan); }

.footer-contact {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
  gap: 1.5rem 2rem;
  padding: clamp(1.5rem, 3vw, 2.1rem) 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.contact-ledger {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.contact-ledger__row dt {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 11px;
  color: var(--slate);
}

.contact-ledger__row dd {
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--white);
  word-break: break-word;
}

.contact-note {
  color: var(--gray);
  font-size: 14px;
  line-height: 1.7;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  padding: 1.25rem 0 2.25rem;
  font-size: 13px;
  color: var(--slate);
}

.footer-legal__copy { color: var(--gray); }
.footer-legal__icp { font-family: var(--font-mono); letter-spacing: 0.02em; }
.footer-legal__note { margin-left: auto; }

/* 7. 通用组件 ---------------------------------------------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 11.5px;
  color: var(--slate);
}

.breadcrumb li { display: inline-flex; align-items: center; gap: 0.5rem; }

.breadcrumb li + li::before {
  content: "/";
  color: var(--deep);
}

.breadcrumb a { color: var(--gray); transition: color 0.18s var(--ease); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--mint); }

.card {
  position: relative;
  padding: clamp(1.1rem, 2.2vw, 1.6rem);
  background: var(--char);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 42px;
  height: 2px;
  background: var(--cyan);
  opacity: 0.85;
}

.card--orange::before { background: var(--orange); }

.card__label {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 11px;
  color: var(--cyan);
}

.card__title { font-size: 1.15rem; margin-bottom: 0.5rem; }
.card__meta { color: var(--gray); font-size: 14px; }

.panel {
  padding: clamp(1rem, 2vw, 1.4rem);
  background: var(--char);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.table-scroll {
  overflow-x: auto;
  background: var(--char);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.data-table { min-width: 560px; font-size: 15px; }

.data-table th {
  padding: 0.7rem 0.75rem;
  text-align: left;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  font-weight: 700;
  color: var(--gray);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.data-table td {
  padding: 0.8rem 0.75rem;
  border-bottom: 1px solid var(--line-soft);
  color: var(--white);
  vertical-align: top;
}

.data-table tbody tr:nth-child(even) { background: rgba(28, 58, 51, 0.35); }
.data-table tbody tr:last-child td { border-bottom: 0; }

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--deep);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--portrait { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.7rem 0.9rem;
  font-size: 13px;
  color: var(--gray);
  background: linear-gradient(180deg, rgba(11, 30, 26, 0), rgba(11, 30, 26, 0.94));
}

.tabs { margin-top: 1.5rem; }

.tab-list {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}

.tab {
  flex: 0 0 auto;
  padding: 0.6rem 0.95rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
  color: var(--gray);
  border: 1px solid transparent;
  border-radius: 2px 2px 0 0;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.tab:hover { color: var(--mint); background: rgba(47, 227, 200, 0.06); }

.tab[aria-selected="true"],
.tab.is-active {
  color: var(--white);
  background: var(--deep);
  border-color: var(--line);
  border-bottom-color: transparent;
}

.tab-panels { margin-top: 1.25rem; }
.tab-panel { display: block; }

.chip-list { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.chip {
  padding: 0.45rem 0.85rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11.5px;
  color: var(--gray);
  background: var(--deep);
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.chip:hover { color: var(--white); border-color: var(--line); }

.chip[aria-pressed="true"],
.chip.is-active {
  color: #06201B;
  background: var(--cyan);
  border-color: var(--cyan);
}

.filter-status {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--slate);
}

/* 8. 动效与可访问性 ---------------------------------------- */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 2px;
}

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

#main-content { display: block; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  html.js [data-reveal] {
    transform: none;
    transition: opacity 160ms linear;
  }

  .btn:hover { transform: none; }
  .site-nav, .header-utility, .header-bar__inner, .header-progress { transition: none; }
}

/* 9. 响应式 ------------------------------------------------ */
@media (max-width: 1080px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-contact { grid-template-columns: 1fr; }
  .contact-ledger { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 1024px) {
  .grid--2,
  .grid--3,
  .grid--rail { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  body { font-size: 16px; }
  body.nav-open { overflow: hidden; }

  :root { --bar-h: 64px; }

  .header-utility { display: none; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 58;
    width: min(320px, 86vw);
    margin: 0;
    padding: 5.5rem 1.25rem 2.5rem;
    background: var(--char);
    border-left: 1px solid var(--line);
    overflow-y: auto;
    transform: translateX(102%);
    transition: transform 0.28s var(--ease);
  }

  .site-nav[data-open="true"] { transform: translateX(0); }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
  }

  .nav-link {
    padding: 0.85rem 0.9rem;
    font-size: 16px;
    border-bottom: 1px solid var(--line-soft);
  }

  .nav-link[aria-current="page"]::after {
    left: auto;
    right: 0.9rem;
    bottom: auto;
    top: 50%;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    transform: translateY(-50%);
  }

  .header-actions { margin-left: auto; }
  .header-actions .btn--primary { padding: 0.62rem 0.8rem; font-size: 11px; }
}

@media (max-width: 720px) {
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.75rem; }
  .footer-legal__note { margin-left: 0; }
}

@media (max-width: 560px) {
  .header-actions .btn--primary { display: none; }
  .footer-nav { grid-template-columns: 1fr; }
  .contact-ledger { grid-template-columns: 1fr; }
  .data-table { min-width: 460px; }
}