/* ==========================================================================
   /assets/site.css — BSPORTS 手机版中文站点 共享样式
   夜场单色阶 + 框架式导航 + 编辑部非对称网格
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --bg: #05070A;
  --bg-alt: #0A1119;
  --line: #1B2733;
  --surface: #111A23;
  --text: #ECF4F7;
  --muted: #8DA0AD;
  --accent: #C8FF3C;
  --accent-2: #31D9FF;
  --data: #FF8B3D;
  --glass: rgba(255, 255, 255, 0.08);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --gutter: clamp(16px, 4vw, 48px);
  --header-h: 64px;
  --shell: 1240px;
  --stack-gap: 1rem;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(141, 160, 173, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(141, 160, 173, 0.05) 1px, transparent 1px),
    radial-gradient(1100px 560px at 82% -12%, rgba(49, 217, 255, 0.10), transparent 62%),
    radial-gradient(880px 480px at 0% 0%, rgba(200, 255, 60, 0.06), transparent 60%);
  background-size: 48px 48px, 48px 48px, auto, auto;
  background-attachment: fixed;
}

h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { width: 100%; border-collapse: collapse; }

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

/* ---------- 3. 排版 ---------- */
.display {
  font-size: clamp(2.6rem, 7vw, 6rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.eyebrow,
.section__num,
.footer-col-title,
.footer-tagline,
.header-meter__label,
.header-meter__current,
.nav-toggle-text,
.footer-label,
.footer-legal,
.footer-note,
.data-line,
.copy-btn {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.section__num { font-size: 0.75rem; letter-spacing: 0.18em; color: var(--accent); }

.lede {
  max-width: 44ch;
  font-size: clamp(1.0625rem, 1.6vw, 1.3125rem);
  line-height: 1.6;
  color: var(--muted);
}

.prose { max-width: 38em; font-size: 1.0625rem; line-height: 1.7; color: var(--text); }
.prose p + p { margin-top: 1.1em; }
.prose a { color: var(--accent-2); border-bottom: 1px solid rgba(49, 217, 255, 0.45); }
.prose a:hover { color: var(--accent); border-bottom-color: var(--accent); }

.note { font-size: 0.8125rem; line-height: 1.6; letter-spacing: 0.02em; color: var(--muted); }

.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.data-line {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--muted);
}

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

.section { padding-block: clamp(48px, 7vw, 96px); }

.section--alt {
  background: var(--bg-alt);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 1.25rem;
  margin-bottom: clamp(20px, 3vw, 36px);
}

.rule { height: 2px; border: 0; margin: 0; background: var(--line); }

.stack > * + * { margin-top: var(--stack-gap); }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 32px);
}

@media (min-width: 768px) {
  .span-3 { grid-column: span 3; }
  .span-4 { grid-column: span 4; }
  .span-5 { grid-column: span 5; }
  .span-6 { grid-column: span 6; }
  .span-7 { grid-column: span 7; }
  .span-8 { grid-column: span 8; }
  .span-9 { grid-column: span 9; }
  .span-10 { grid-column: span 10; }
  .span-12 { grid-column: span 12; }
}

@media (max-width: 767px) {
  .grid-12 { grid-template-columns: 1fr; }
  [class*="span-"] { grid-column: 1 / -1; }
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.85em 1.4em;
  border: 2px solid var(--line);
  background: transparent;
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.02em;
  text-align: center;
  transition: background-color 0.24s var(--ease), border-color 0.24s var(--ease),
    color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.btn:hover { border-color: var(--accent-2); color: var(--accent-2); }

.btn--accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #05070A;
  font-weight: 700;
}
.btn--accent:hover {
  background: var(--accent);
  color: #05070A;
  box-shadow: 5px 5px 0 0 rgba(200, 255, 60, 0.24);
}

.btn--ghost { border-color: var(--accent-2); color: var(--accent-2); }
.btn--ghost:hover { background: rgba(49, 217, 255, 0.10); color: var(--accent-2); }

.btn--quiet { border-color: var(--line); color: var(--muted); }
.btn--quiet:hover { border-color: var(--text); color: var(--text); }

.btn--sm { padding: 0.6em 1em; font-size: 0.8125rem; border-width: 2px; }
.btn--block { width: 100%; }

/* ---------- 6. 头部：框架式导航 ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 120;
  padding: 0.75rem 1.2rem;
  background: var(--accent);
  color: #05070A;
  font-weight: 700;
}
.skip-link:focus { left: var(--gutter); top: 0.5rem; }

.rail {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 12px;
  z-index: 1;
  pointer-events: none;
  border-inline: 2px solid var(--line);
}
.rail--left { left: 0; }
.rail--right { right: 0; }
.rail::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(141, 160, 173, 0.38) 0 1px,
    transparent 1px 36px
  );
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(5, 7, 10, 0.93);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--line);
  transition: border-color 0.24s var(--ease);
}
.site-header[data-scrolled] { border-bottom-color: rgba(200, 255, 60, 0.55); }

.header-bar { position: relative; z-index: 2; }

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 28px);
  min-height: var(--header-h);
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.brand { display: flex; align-items: center; gap: 0.75rem; flex: 0 0 auto; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 2px solid var(--accent);
  background: rgba(200, 255, 60, 0.08);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
}

.brand-copy { display: flex; flex-direction: column; line-height: 1.25; }
.brand-title { font-size: 0.9375rem; font-weight: 700; letter-spacing: 0.01em; }

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  white-space: nowrap;
}
.site-header[data-scrolled] .brand-sub { opacity: 0; visibility: hidden; }
.brand-sub { transition: opacity 0.24s var(--ease), visibility 0.24s; }

.site-nav { flex: 1 1 auto; min-width: 0; }

.nav-list {
  display: flex;
  gap: clamp(8px, 1.4vw, 22px);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.nav-list::-webkit-scrollbar { display: none; }

.nav-item { display: flex; }

.nav-link {
  position: relative;
  display: block;
  padding: 0.55rem 0.1rem;
  color: var(--muted);
  font-size: 0.9375rem;
  white-space: nowrap;
  transition: color 0.2s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0.1rem;
  height: 3px;
  background: var(--accent);
  transition: right 0.24s var(--ease);
}
.nav-link:hover { color: var(--text); }
.nav-link[aria-current="page"] { color: var(--text); font-weight: 600; }
.nav-link[aria-current="page"]::after { right: 0; }

.nav-foot { display: none; }

.header-actions { display: none; align-items: center; gap: 0.5rem; flex: 0 0 auto; }
.header-cta { display: none; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
  padding: 0.5rem 0.7rem;
  border: 2px solid var(--line);
  transition: border-color 0.24s var(--ease);
}
.nav-toggle:hover { border-color: var(--accent-2); }
.nav-toggle[aria-expanded="true"] { border-color: var(--accent); }

.nav-toggle-bars { position: relative; width: 18px; height: 12px; }
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  transition: transform 0.24s var(--ease), top 0.24s var(--ease), bottom 0.24s var(--ease);
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { bottom: 5px; transform: rotate(-45deg); }

.nav-toggle-text {
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.header-meter {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 0 var(--gutter) 6px;
}
.header-meter__line { position: relative; flex: 1 1 auto; height: 2px; background: var(--line); }
.header-meter__fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
}
.header-meter__label,
.header-meter__current {
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--muted);
  white-space: nowrap;
}
.header-meter__current { color: var(--accent); }

@media (min-width: 1024px) {
  .header-actions { display: flex; }
  .header-cta { display: inline-flex; }
}

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 1;
    max-height: 100vh;
    overflow-y: auto;
    padding: calc(var(--header-h) + 18px) var(--gutter) 28px;
    background: rgba(5, 7, 10, 0.98);
    border-bottom: 2px solid var(--accent);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.24s var(--ease), transform 0.24s var(--ease), visibility 0.24s;
  }
  .site-nav[data-open] {
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-list { flex-direction: column; gap: 0; overflow: visible; }
  .nav-link { padding: 0.9rem 0; border-bottom: 1px solid var(--line); font-size: 1.0625rem; }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { color: var(--accent); }

  .nav-foot { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.5rem; }
  .nav-foot .btn { flex: 1 1 12rem; }
}

@media (max-width: 1023px) {
  .header-meter__label { display: none; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  border-top: 2px solid var(--line);
  background: var(--bg-alt);
  padding-top: clamp(40px, 6vw, 72px);
}

.footer-inner {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  grid-template-columns: 1fr;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

@media (min-width: 900px) {
  .footer-inner { grid-template-columns: minmax(260px, 1fr) 2fr; }
}

.footer-mark { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.01em; }

.footer-tagline {
  margin-top: 0.4rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.footer-contact { display: grid; gap: 0.9rem; margin-top: 1.5rem; }
.footer-contact__item { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; }

.footer-label {
  min-width: 5em;
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.footer-value { font-size: 0.875rem; color: var(--text); }

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3em 0.6em;
  border: 1px solid var(--line);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  transition: border-color 0.24s var(--ease), color 0.24s var(--ease), background-color 0.24s var(--ease);
}
.copy-btn:hover { border-color: var(--accent-2); color: var(--accent-2); }
.copy-btn[data-copy-state="done"] {
  border-color: var(--accent);
  background: rgba(200, 255, 60, 0.12);
  color: var(--accent);
}
.copy-btn[data-copy-state="fail"] { border-color: var(--data); color: var(--data); }

.footer-cols {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
@media (min-width: 680px) {
  .footer-cols { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.footer-col-title {
  margin-bottom: 0.9rem;
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.footer-list { display: grid; gap: 0.55rem; }
.footer-link { font-size: 0.9375rem; color: var(--text); transition: color 0.2s var(--ease); }
.footer-link:hover { color: var(--accent); }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  max-width: var(--shell);
  margin: clamp(32px, 5vw, 56px) auto 0;
  padding: 1.1rem var(--gutter);
  border-top: 1px solid var(--line);
}

.footer-legal,
.footer-note { font-size: 0.75rem; letter-spacing: 0.1em; color: var(--muted); }

/* ---------- 8. 卡片与数据 ---------- */
.card {
  position: relative;
  padding: clamp(16px, 2.2vw, 28px);
  background: var(--surface);
  border: 1px solid var(--line);
  transition: border-color 0.24s var(--ease), box-shadow 0.24s var(--ease),
    background-color 0.24s var(--ease);
}
.card:hover,
.card:focus-within {
  border-color: var(--accent);
  box-shadow: 6px 6px 0 0 var(--line);
}

.card--data { background: var(--bg-alt); }

.card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding-bottom: 0.85rem;
  margin-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.card__title { font-size: 1.0625rem; font-weight: 700; letter-spacing: 0.01em; }
.card__meta { font-family: var(--font-mono); font-size: 0.6875rem; letter-spacing: 0.16em; color: var(--muted); }

.stat { display: grid; gap: 0.2rem; align-content: start; }
.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 500;
  line-height: 1.1;
  color: var(--text);
}
.stat--accent .stat__value { color: var(--accent); }
.stat__label { font-size: 0.75rem; letter-spacing: 0.12em; color: var(--muted); }
.stat__delta { font-family: var(--font-mono); font-size: 0.75rem; color: var(--data); }

.ledger { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-size: 0.8125rem; }
.ledger th,
.ledger td { padding: 0.6rem 0.5rem; text-align: left; border-bottom: 1px solid var(--line); }
.ledger th { font-size: 0.6875rem; font-weight: 500; letter-spacing: 0.16em; color: var(--muted); }
.ledger td:last-child,
.ledger th:last-child { text-align: right; }

/* ---------- 9. 标签、徽标、标签页 ---------- */
.chip-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.4em 0.8em;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.chip:hover { border-color: var(--accent-2); color: var(--accent-2); }
.chip[aria-pressed="true"],
.chip[aria-selected="true"] {
  border-color: var(--accent);
  background: rgba(200, 255, 60, 0.10);
  color: var(--accent);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2em 0.55em;
  background: var(--data);
  color: #05070A;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
}

.tabs {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 2px solid var(--line);
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  margin-bottom: -2px;
  padding: 0.75em 1.1em;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.tab:hover { color: var(--text); }
.tab[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- 10. 折叠面板 ---------- */
.accordion { border-top: 1px solid var(--line); }
.accordion__item { border-bottom: 1px solid var(--line); }

.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1.1rem 0;
  text-align: left;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  transition: color 0.2s var(--ease);
}
.accordion__trigger:hover { color: var(--accent); }

.accordion__sign {
  flex: 0 0 auto;
  width: 1.4em;
  height: 1.4em;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
}
.accordion__sign::before { content: "+"; }
.accordion__trigger[aria-expanded="true"] .accordion__sign::before { content: "−"; }
.accordion__trigger[aria-expanded="true"] .accordion__sign { border-color: var(--accent); }

.accordion__panel { height: 0; overflow: hidden; transition: height 0.28s var(--ease); }
.accordion__body { padding-bottom: 1.2rem; max-width: 46em; color: var(--muted); }

/* ---------- 11. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.breadcrumbs a { transition: color 0.2s var(--ease); }
.breadcrumbs a:hover { color: var(--accent-2); }
.breadcrumbs__sep { color: var(--line); }
.breadcrumbs [aria-current="page"] { color: var(--text); }

/* ---------- 12. 图形容器（页面阶段放图） ---------- */
.media { margin: 0; }
.media__frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--surface);
  background-image:
    linear-gradient(180deg, rgba(49, 217, 255, 0.14), rgba(5, 7, 10, 0.9)),
    repeating-linear-gradient(90deg, rgba(141, 160, 173, 0.12) 0 1px, transparent 1px 40px);
}
.media__frame--wide { aspect-ratio: 21 / 9; }
.media__frame--tall { aspect-ratio: 3 / 4; }
.media__frame--square { aspect-ratio: 1 / 1; }

.media__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 10, 0.1) 30%, rgba(5, 7, 10, 0.88));
}
.media__badge {
  position: absolute;
  top: 0;
  left: 0;
  padding: 0.3em 0.7em;
  background: var(--accent);
  color: #05070A;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
}
.media__caption {
  margin-top: 0.65rem;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 13. 入场动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 14. 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .btn--accent:hover { box-shadow: none; }
  .card:hover, .card:focus-within { box-shadow: none; }
}

@media (max-width: 1023px) {
  .rail { display: none; }
}