/* ============================================================
   天博赛场 /assets/site.css
   深夜赛场绿 · 电光青 · 荧光橙 · 记分牌琥珀
   ============================================================ */

/* ---------- 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, li, figure, blockquote, dl, dt, dd { margin: 0; padding: 0; }

ul, ol { list-style: none; }

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

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

summary { cursor: pointer; }

summary::-webkit-details-marker { display: none; }

/* ---------- 2. Tokens ---------- */
:root {
  --pitch: #071A12;
  --ink-blue: #0B2036;
  --paper: #F3E9D6;
  --cyan: #2BE6D0;
  --orange: #FF7A2F;
  --amber: #FFC24B;
  --line-white: #D6E4DE;
  --card: #12302A;
  --track: #1E6E68;
  --paper-dim: #CBBBA0;

  --bg: var(--pitch);
  --text: var(--paper);
  --muted: var(--paper-dim);
  --hair: rgba(30, 110, 104, 0.55);

  --shell: 1200px;
  --gutter: clamp(16px, 4vw, 40px);

  --step: 0.16s;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  --font-display: "Oswald", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, Menlo, "Courier New", monospace;
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  background-color: var(--pitch);
  background-image:
    radial-gradient(1100px 620px at 80% -12%, rgba(43, 230, 208, 0.10), transparent 62%),
    radial-gradient(880px 520px at 6% 108%, rgba(255, 122, 47, 0.09), transparent 66%),
    linear-gradient(180deg, rgba(11, 32, 54, 0.72), rgba(7, 26, 18, 0) 560px);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.8;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: linear-gradient(to right, rgba(30, 110, 104, 0.10) 1px, transparent 1px);
  background-size: 90px 100%;
}

body > * { position: relative; z-index: 1; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  color: var(--paper);
}

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.shell {
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  padding: 10px 20px;
  background: var(--cyan);
  color: #04211c;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  transition: top var(--step) var(--ease);
}

.skip-link:focus { top: 10px; }

/* ---------- 5. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(7, 26, 18, 0.95);
  border-bottom: 1px solid var(--hair);
  backdrop-filter: blur(10px);
}

.header-strip {
  background: linear-gradient(90deg, rgba(11, 32, 54, 0.95), rgba(7, 26, 18, 0.35));
  border-bottom: 1px solid rgba(30, 110, 104, 0.4);
}

.strip-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 34px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.strip-tag { color: var(--line-white); }

.strip-meta { color: var(--track); }

.masthead-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 14px;
  padding: 16px 0;
  transition: padding 0.2s var(--ease);
}

.site-header.is-compact .header-strip { display: none; }

.site-header.is-compact .masthead-inner { padding: 9px 0; }

.brand {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  text-align: center;
}

.brand-mark {
  width: 38px;
  height: 5px;
  background: linear-gradient(90deg, var(--cyan) 0 62%, var(--orange) 62% 100%);
  transform: skewX(-30deg);
}

.brand-text {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--paper);
}

.brand-note {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: var(--cyan);
}

.cta-live {
  grid-column: 3;
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--paper);
  border: 1px solid rgba(255, 122, 47, 0.7);
  background: linear-gradient(90deg, rgba(255, 122, 47, 0.2), rgba(255, 122, 47, 0.04));
  transition: background var(--step) var(--ease), color var(--step) var(--ease), border-color var(--step) var(--ease);
}

.cta-live::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--orange);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(255, 122, 47, 0.9);
}

.cta-live:hover,
.cta-live:focus-visible {
  background: var(--orange);
  color: #1a0c02;
  border-color: var(--orange);
}

.cta-live:hover::before { background: #1a0c02; box-shadow: none; }

.nav-toggle {
  grid-column: 1;
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 4px;
  color: var(--line-white);
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: transform var(--step) var(--ease);
}

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child { transform: translateY(5px) rotate(45deg); }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { transform: translateY(-5px) rotate(-45deg); }

.site-nav { border-top: 1px solid rgba(30, 110, 104, 0.45); }

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(10px, 3vw, 44px);
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.nav-link {
  position: relative;
  display: block;
  padding: 13px 2px 12px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--line-white);
  transition: color var(--step) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 5px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease), background var(--step) var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--cyan); }

.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

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

.nav-link[aria-current="page"]::after { transform: scaleX(1); background: var(--orange); }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(30, 110, 104, 0.35);
  overflow: hidden;
}

.scroll-progress-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--amber) 60%, var(--orange));
}

/* ---------- 6. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background: linear-gradient(180deg, rgba(11, 32, 54, 0.88), rgba(7, 26, 18, 1));
  border-top: 1px solid var(--hair);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--amber) 46%, var(--orange));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.4fr;
  gap: clamp(24px, 4vw, 56px);
  padding: clamp(40px, 6vw, 76px) 0 clamp(28px, 4vw, 48px);
}

.footer-brand { display: grid; gap: 12px; align-content: start; }

.footer-logo {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--paper);
}

.footer-note {
  font-size: 14px;
  color: var(--muted);
  max-width: 26ch;
}

.footer-cta {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
  border: 1px solid rgba(43, 230, 208, 0.5);
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: background var(--step) var(--ease), color var(--step) var(--ease), border-color var(--step) var(--ease);
}

.footer-cta:hover,
.footer-cta:focus-visible {
  background: var(--cyan);
  color: #04211c;
  border-color: var(--cyan);
}

.footer-col { display: grid; gap: 14px; align-content: start; }

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--orange);
}

.footer-list { display: grid; gap: 9px; }

.footer-link {
  position: relative;
  display: inline-block;
  font-size: 14px;
  color: var(--line-white);
  transition: color var(--step) var(--ease), padding-left var(--step) var(--ease);
}

.footer-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: width var(--step) var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible { color: var(--cyan); padding-left: 14px; }

.footer-link:hover::before,
.footer-link:focus-visible::before { width: 10px; }

.footer-fact {
  font-size: 13px;
  line-height: 1.75;
  color: var(--line-white);
}

.fact-key {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.fact-dim { color: var(--muted); font-size: 12.5px; }

.footer-base { border-top: 1px solid rgba(30, 110, 104, 0.45); }

.footer-base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 20px 0 30px;
}

.legal-links { display: flex; flex-wrap: wrap; gap: 20px; }

.legal-link {
  font-size: 13px;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color var(--step) var(--ease), border-color var(--step) var(--ease);
}

.legal-link:hover,
.legal-link:focus-visible { color: var(--cyan); border-color: var(--cyan); }

.footer-copy {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--track);
}

.to-top {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--line-white);
  padding: 8px 14px;
  border: 1px solid rgba(30, 110, 104, 0.7);
  transition: border-color var(--step) var(--ease), color var(--step) var(--ease), background var(--step) var(--ease);
}

.to-top:hover,
.to-top:focus-visible {
  color: #04211c;
  background: var(--amber);
  border-color: var(--amber);
}

/* ---------- 7. Generic layout ---------- */
.section { padding: clamp(44px, 7vw, 96px) 0; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--hair);
}

.section-title { font-size: clamp(24px, 3.4vw, 38px); }

.section-note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--orange);
}

.track-line {
  height: 1px;
  border: 0;
  background-image: repeating-linear-gradient(90deg, var(--track) 0 14px, transparent 14px 24px);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(16px, 2.4vw, 32px);
}

.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-12 { grid-column: span 12; }

/* ---------- 8. Components ---------- */
.cut-panel {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  background: var(--card);
  border: 1px solid rgba(43, 230, 208, 0.22);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
  transition: background var(--step) var(--ease), border-color var(--step) var(--ease);
}

.cut-panel:hover { background: #163a33; border-color: rgba(43, 230, 208, 0.45); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--paper);
  background: rgba(18, 48, 42, 0.7);
  border: 1px solid var(--track);
  transition: background var(--step) var(--ease), color var(--step) var(--ease), border-color var(--step) var(--ease);
}

.btn::after {
  content: "";
  width: 14px;
  height: 2px;
  background: currentColor;
  transform: skewX(-30deg);
}

.btn:hover,
.btn:focus-visible { color: var(--cyan); border-color: var(--cyan); background: rgba(43, 230, 208, 0.1); }

.btn-primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04211c;
}

.btn-primary:hover,
.btn-primary:focus-visible { background: var(--amber); border-color: var(--amber); color: #1a1200; }

.btn-ghost { background: transparent; border-color: rgba(243, 233, 214, 0.35); }

.link-trail {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--paper);
  transition: color var(--step) var(--ease);
}

.link-trail::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease);
}

.link-trail:hover,
.link-trail:focus-visible { color: var(--cyan); }

.link-trail:hover::after,
.link-trail:focus-visible::after { transform: scaleX(1); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid rgba(43, 230, 208, 0.42);
}

.tag-accent { color: var(--orange); border-color: rgba(255, 122, 47, 0.5); }

.note-vertical {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
}

.stat { display: flex; flex-direction: column; gap: 2px; }

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.accordion {
  border: 1px solid var(--hair);
  background: rgba(18, 48, 42, 0.55);
}

.accordion + .accordion { margin-top: 10px; }

.accordion summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--paper);
  transition: color var(--step) var(--ease), background var(--step) var(--ease);
}

.accordion summary:hover { color: var(--cyan); background: rgba(43, 230, 208, 0.07); }

.accordion[open] summary { color: var(--amber); }

.accordion-body {
  padding: 0 20px 18px;
  font-size: 15px;
  color: var(--line-white);
}

.breadcrumb { padding: 22px 0 0; }

.breadcrumb-list { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }

.breadcrumb-item {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 10px;
  color: var(--track);
}

.breadcrumb-link { color: var(--line-white); transition: color var(--step) var(--ease); }

.breadcrumb-link:hover,
.breadcrumb-link:focus-visible { color: var(--cyan); }

.prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--line-white);
}

.prose h2 { margin: 1.8em 0 0.6em; font-size: clamp(22px, 2.6vw, 30px); }

.prose h3 { margin: 1.5em 0 0.5em; font-size: 18px; letter-spacing: 0.02em; }

.prose p + p { margin-top: 1em; }

.prose ul, .prose ol { display: grid; gap: 0.55em; margin: 1em 0; }

.prose li { padding-left: 18px; position: relative; }

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 9px;
  height: 2px;
  background: var(--orange);
  transform: skewX(-30deg);
}

.prose strong { color: var(--paper); font-weight: 700; }

.prose a { color: var(--cyan); border-bottom: 1px solid rgba(43, 230, 208, 0.5); }

/* ---------- 9. Media frames (image placeholder base) ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--card), var(--ink-blue));
  border: 1px solid rgba(30, 110, 104, 0.65);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.4s var(--ease);
}

.media-frame:hover > img { transform: scale(1.03); }

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(43, 230, 208, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43, 230, 208, 0.12) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.55;
}

.media-caption {
  position: absolute;
  left: 16px;
  bottom: 14px;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--paper);
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.8);
}

.ratio-21-9 { aspect-ratio: 21 / 9; }
.ratio-16-9 { aspect-ratio: 16 / 9; }
.ratio-4-3 { aspect-ratio: 4 / 3; }
.ratio-1-1 { aspect-ratio: 1 / 1; }
.ratio-3-4 { aspect-ratio: 3 / 4; }

/* ---------- 10. Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

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

/* ---------- 11. Responsive ---------- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .span-4, .span-5, .span-6, .span-7, .span-8, .span-9 { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .strip-meta { display: none; }
  .strip-inner { justify-content: flex-start; }

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

  .cta-live { padding: 8px 12px; font-size: 12px; letter-spacing: 0.04em; }
  .cta-live::before { display: none; }

  .site-nav { display: none; }

  .site-nav[data-open="true"] { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px var(--gutter) 18px;
    width: 100%;
  }

  .nav-item + .nav-item { border-top: 1px dashed rgba(30, 110, 104, 0.5); }

  .nav-link { padding: 14px 2px; font-size: 15px; }

  .nav-link::after { display: none; }

  .nav-link:hover { color: var(--cyan); }

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

@media (max-width: 720px) {
  .brand-mark { width: 28px; height: 4px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-base-inner { flex-direction: column; align-items: flex-start; }
}

@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;
  }

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

  .media-frame:hover > img { transform: none; }
}