/* =========================================================
   YABO赛场 — /assets/site.css
   夜场转播间基调 · 精密网格 · 侧边轨道 · 双版本切换
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

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;
}

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

h1, h2, h3, h4, h5, h6, p, figure { margin: 0; }

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

/* ---------- 2. Tokens ---------- */
:root {
  --c-ink: #0B1B2E;
  --c-deep: #071322;
  --c-cyan: #35E0D6;
  --c-orange: #FF6B2C;
  --c-yellow: #FFD23F;
  --c-bone: #F2EFE6;
  --c-gray: #8A93A0;
  --c-moss: #4C7A5E;
  --c-clay: #C4643C;
  --c-grid: rgba(242, 239, 230, 0.08);
  --c-line: rgba(242, 239, 230, 0.15);
  --c-line-soft: rgba(242, 239, 230, 0.07);

  --f-head: "Archivo Narrow", "Oswald", "Noto Sans SC", "Source Han Sans SC",
            "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --f-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
            "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --f-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular,
            Menlo, Consolas, monospace;

  --top-h: 56px;
  --rail-w: 64px;

  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 32px;
  --sp-5: 48px;
  --sp-6: 72px;

  --z-rail: 45;
  --z-head: 50;
  --z-scrim: 65;
  --z-drawer: 70;
  --z-progress: 80;
  --z-skip: 120;
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  padding-top: var(--top-h);
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--c-bone);
  background-color: var(--c-ink);
  background-image:
    radial-gradient(1100px 520px at 12% -6%, rgba(53, 224, 214, 0.10), transparent 68%),
    radial-gradient(900px 480px at 96% 4%, rgba(255, 107, 44, 0.07), transparent 70%),
    linear-gradient(to right, var(--c-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--c-grid) 1px, transparent 1px);
  background-size: auto, auto, 88px 88px, 88px 88px;
  background-attachment: fixed, fixed, fixed, fixed;
  overflow-x: hidden;
}

@media (min-width: 960px) {
  body { padding-left: var(--rail-w); }
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--f-head);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--c-bone);
}

::selection { background: var(--c-cyan); color: #06131f; }

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

#main-content { scroll-margin-top: 76px; }

/* ---------- 4. Layout primitives ---------- */
.wrap {
  width: 100%;
  max-width: 1340px;
  margin-inline: auto;
  padding-inline: 20px;
}

@media (min-width: 960px) {
  .wrap { padding-inline: 32px; }
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--c-line);
}

.mono {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

/* ---------- 5. Skip link ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 10px;
  z-index: var(--z-skip);
  padding: 10px 18px;
  background: var(--c-cyan);
  color: #06131f;
  font-family: var(--f-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: top 0.18s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 10px;
  outline: 2px solid var(--c-bone);
  outline-offset: 2px;
}

/* ---------- 6. Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--top-h);
  z-index: var(--z-head);
  background: rgba(7, 19, 34, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--c-line);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(53, 224, 214, 0.55), transparent);
  pointer-events: none;
}

.header-bar {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-inline: 14px;
}

@media (min-width: 960px) {
  .site-header { left: var(--rail-w); }
  .header-bar { padding-inline: 18px; gap: 14px; }
}

/* brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  padding: 6px 0;
}

.brand-tick {
  display: block;
  width: 26px;
  height: 3px;
  background: var(--c-cyan);
  flex: 0 0 auto;
}

.brand-name {
  font-family: var(--f-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-bone);
  white-space: nowrap;
}

/* version switch */
.ver-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
  padding: 2px;
  border: 1px solid var(--c-line);
  background: rgba(11, 27, 46, 0.75);
  flex: 0 1 auto;
}

.ver-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-gray);
  border: 1px solid transparent;
  white-space: nowrap;
  transition: color 0.18s ease, background-color 0.18s ease,
              border-color 0.18s ease;
}

.ver-btn:hover { color: var(--c-bone); }

.ver-btn.is-on {
  background: var(--c-orange);
  border-color: var(--c-orange);
  color: #08131f;
  font-weight: 700;
}

.ver-dot {
  display: block;
  width: 6px;
  height: 6px;
  background: currentColor;
  flex: 0 0 auto;
}

/* header cta */
.header-link {
  display: inline-flex;
  align-items: center;
  padding: 7px 13px;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--c-bone);
  border: 1px solid var(--c-line);
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.header-link:hover {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* mobile nav toggle */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  border: 1px solid var(--c-line);
  color: var(--c-bone);
  font-size: 13px;
  letter-spacing: 0.05em;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.nav-toggle:hover { color: var(--c-cyan); border-color: var(--c-cyan); }

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 16px;
  height: 12px;
}

.nav-toggle-box i {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-box i:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-box i:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-box i:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.nav-toggle-text { white-space: nowrap; }

@media (min-width: 960px) {
  .nav-toggle { display: none; }
}

@media (max-width: 700px) {
  .header-link { display: none; }
}

@media (max-width: 460px) {
  .brand-name { font-size: 16px; }
  .brand-tick { width: 18px; }
  .ver-btn { padding: 6px 8px; font-size: 11px; gap: 4px; }
  .ver-dot { display: none; }
  .nav-toggle-text { display: none; }
}

/* ---------- 7. Rail navigation ---------- */
.site-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: var(--z-rail);
  display: flex;
  flex-direction: column;
  padding-top: calc(var(--top-h) + 14px);
  padding-bottom: 16px;
  background: var(--c-deep);
  border-right: 1px solid var(--c-line);
  overflow: hidden;
}

.rail-list {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  overflow-y: auto;
  scrollbar-width: none;
}

.rail-list::-webkit-scrollbar { display: none; }

.rail-item { display: flex; }

.rail-link {
  display: block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  padding: 10px 0;
  border-left: 2px solid transparent;
  font-family: var(--f-head);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--c-gray);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.rail-link:hover {
  color: var(--c-bone);
  border-left-color: var(--c-gray);
}

.rail-link[aria-current="page"] {
  color: var(--c-cyan);
  border-left-color: var(--c-cyan);
}

.rail-foot {
  flex: 0 0 auto;
  display: flex;
  justify-content: center;
  padding-top: 12px;
}

.rail-live {
  display: block;
  width: 6px;
  height: 6px;
  background: var(--c-cyan);
  border-radius: 50%;
  animation: railPulse 1.9s ease-in-out infinite;
}

@keyframes railPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.7); }
}

/* mobile drawer */
@media (max-width: 959px) {
  .site-rail {
    width: 272px;
    z-index: var(--z-drawer);
    padding-top: calc(var(--top-h) + 18px);
    transform: translateX(-100%);
    transition: transform 0.24s ease;
    border-right: 1px solid var(--c-line);
  }

  .site-rail[data-open] { transform: translateX(0); }

  .rail-list {
    display: block;
    padding-inline: 14px;
    overflow-y: auto;
  }

  .rail-item { display: block; }

  .rail-link {
    writing-mode: horizontal-tb;
    font-size: 16px;
    letter-spacing: 0.06em;
    padding: 14px 12px;
    border-left: 2px solid transparent;
    border-bottom: 1px solid var(--c-line-soft);
  }

  .rail-link[aria-current="page"] {
    background: rgba(53, 224, 214, 0.07);
  }

  .rail-foot { padding-bottom: 8px; }
}

/* scrim */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: var(--z-scrim);
  background: rgba(7, 19, 34, 0.72);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.nav-scrim.is-on {
  opacity: 1;
  visibility: visible;
}

@media (min-width: 960px) {
  .nav-scrim { display: none; }
}

/* ---------- 8. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: var(--sp-6);
  padding: var(--sp-5) 0 var(--sp-3);
  background: var(--c-deep);
  border-top: 1px solid var(--c-line);
  color: var(--c-gray);
  font-size: 14px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1.2fr;
  gap: var(--sp-4);
}

.footer-col { min-width: 0; }

.footer-brand {
  font-family: var(--f-head);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-bone);
}

.footer-tagline {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--c-line);
  font-size: 14px;
  color: var(--c-gray);
}

.footer-title {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin-bottom: 12px;
}

.footer-title--gap { margin-top: 24px; }

.footer-links li { margin: 0; }

.footer-links a {
  display: inline-block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--c-gray);
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.footer-links a:hover {
  color: var(--c-bone);
  border-bottom-color: var(--c-cyan);
}

.footer-contact { margin-top: 4px; }

.footer-contact-item {
  display: block;
  padding: 3px 0;
  font-family: var(--f-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-gray);
  word-break: break-word;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  margin-top: var(--sp-4);
  padding-top: var(--sp-2);
  border-top: 1px solid var(--c-line);
}

.footer-legal {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--c-gray);
}

.footer-note {
  flex: 1 1 320px;
  font-size: 12px;
  line-height: 1.6;
  color: rgba(138, 147, 160, 0.85);
}

@media (max-width: 900px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-col--brand { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .footer-inner { grid-template-columns: 1fr; gap: var(--sp-3); }
  .footer-meta { flex-direction: column; align-items: flex-start; }
}

/* ---------- 9. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--f-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  cursor: pointer;
  text-align: center;
  transition: background-color 0.18s ease, color 0.18s ease,
              border-color 0.18s ease;
}

.btn--solid {
  background: var(--c-orange);
  color: #08131f;
}
.btn--solid:hover { background: #ff8a5a; }

.btn--line {
  border-color: var(--c-line);
  color: var(--c-bone);
}
.btn--line:hover {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
}

.btn--cyan {
  background: var(--c-cyan);
  color: #06131f;
}
.btn--cyan:hover { background: #6aeee6; }

/* ---------- 10. Breadcrumbs ---------- */
.crumbs {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--c-gray);
}

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.crumbs__item { display: inline-flex; align-items: center; gap: 8px; }

.crumbs__item + .crumbs__item::before {
  content: "/";
  color: rgba(138, 147, 160, 0.5);
}

.crumbs__item a { color: var(--c-gray); }
.crumbs__item a:hover { color: var(--c-cyan); }

.crumbs__item[aria-current="page"] { color: var(--c-bone); }

/* ---------- 11. Section header ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.eyebrow::before {
  content: "";
  display: block;
  width: 22px;
  height: 1px;
  background: var(--c-cyan);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-2);
  margin-bottom: var(--sp-3);
}

.section-title {
  font-size: 30px;
  letter-spacing: -0.02em;
}

@media (min-width: 960px) {
  .section-title { font-size: 44px; }
}

.section-lead {
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-gray);
}

/* ---------- 12. Panel ---------- */
.panel {
  border: 1px solid var(--c-line);
  background: rgba(7, 19, 34, 0.62);
  border-radius: 0;
}

.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--c-line);
}

.panel__title {
  font-size: 15px;
  letter-spacing: 0.02em;
}

.panel__body { padding: 16px; }

/* ---------- 13. Chips ---------- */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--c-gray);
  border: 1px solid var(--c-line);
  border-radius: 0;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease,
              background-color 0.18s ease;
}

.chip:hover {
  color: var(--c-bone);
  border-color: var(--c-gray);
}

.chip[aria-pressed="true"],
.chip.is-on {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: #06131f;
  font-weight: 700;
}

/* ---------- 14. Stat grid ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.stat {
  background: var(--c-deep);
  padding: 16px;
}

.stat__value {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  line-height: 1;
  color: var(--c-cyan);
}

.stat__label {
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-gray);
}

/* ---------- 15. Media frame ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--c-line);
  border-radius: 0;
  background:
    linear-gradient(135deg, rgba(53, 224, 214, 0.10), rgba(255, 107, 44, 0.06)),
    var(--c-deep);
}

.media-frame img,
.media-frame video,
.media-frame picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(
      to bottom,
      rgba(7, 19, 34, 0.30) 0 1px,
      transparent 1px 4px
    ),
    radial-gradient(120% 100% at 50% 0%, transparent 45%, rgba(7, 19, 34, 0.55) 100%);
  opacity: 0.75;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__cap {
  position: absolute;
  left: 12px;
  bottom: 10px;
  z-index: 2;
  padding: 3px 8px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-bone);
  background: rgba(7, 19, 34, 0.72);
  border: 1px solid var(--c-line);
}

/* ---------- 16. Prose ---------- */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.7;
}

.prose h2 {
  font-size: 22px;
  margin: var(--sp-4) 0 12px;
}

.prose h3 {
  font-size: 17px;
  margin: var(--sp-3) 0 8px;
}

.prose p { margin: 0 0 16px; }

.prose ul,
.prose ol {
  list-style: disc;
  padding-left: 22px;
  margin: 0 0 16px;
}

.prose ol { list-style: decimal; }

.prose li { margin: 6px 0; }

.prose a {
  color: var(--c-cyan);
  border-bottom: 1px solid rgba(53, 224, 214, 0.45);
}

.prose a:hover { border-bottom-color: var(--c-cyan); }

.prose strong { color: var(--c-bone); }

/* ---------- 17. Reveal ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ---------- 18. Scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: var(--z-progress);
  pointer-events: none;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-orange));
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

/* ---------- 19. Reduced motion ---------- */
@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;
  }

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

  .site-rail { transition: none; }
  .scroll-progress { display: none; }
}