/* ==========================================================================
   星空体育 · CN 官方站点 — 共享样式 /assets/site.css
   深空蓝纵向夜景：左侧竖向索引构成长卷边框
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, figcaption, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
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; }

/* ---------- 2. Tokens ---------- */
:root {
  --deepspace-950: #04060E;
  --deepspace-800: #0A0F24;
  --deepspace-600: #141B3C;
  --glass-layer: rgba(255, 255, 255, 0.06);
  --nebula-500: #7C5CFF;
  --nebula-300: #A99BFF;
  --cyan-400: #2FE3D4;
  --amber-400: #FF9A3C;
  --ink-100: #EEF2FF;
  --ink-400: #98A2C4;
  --line-600: #2A3358;
  --rail: 78px;
  --bar: 62px;
  --pad: clamp(18px, 4vw, 56px);
  --maxw: 1200px;
  --font-sans: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', ui-monospace, 'Courier New', monospace;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. Base / 中文排版 ---------- */
body {
  background-color: var(--deepspace-950);
  color: var(--ink-100);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 300;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
p { max-width: 40ch; }
h1, h2, h3, h4 { font-weight: 400; line-height: 1.25; }
::selection { background: var(--nebula-500); color: var(--ink-100); }

:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 300;
  padding: 12px 24px;
  background: var(--cyan-400);
  color: var(--deepspace-950);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.16em;
  border-radius: 0 0 4px 4px;
  transform: translate(-50%, -160%);
  transition: transform 200ms var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); }

/* ---------- 5. Header ---------- */
.site-header { position: relative; }

.frame-top {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 200;
  background: rgba(124, 92, 255, 0.26);
  pointer-events: none;
}
.frame-progress {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--nebula-500), var(--cyan-400));
  transition: transform 160ms linear;
}

.header-bar {
  position: sticky;
  top: 0;
  z-index: 150;
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 28px);
  min-height: var(--bar);
  padding: 10px var(--pad) 10px clamp(14px, 2vw, 26px);
  background: rgba(4, 6, 14, 0.88);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-600);
}

.brand-link { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.brand-glyph {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--nebula-500);
  border-radius: 50%;
  color: var(--cyan-400);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0;
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}
.brand-link:hover .brand-glyph { border-color: var(--cyan-400); color: var(--ink-100); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 15px; font-weight: 500; letter-spacing: 0.18em; color: var(--ink-100); }
.brand-sub { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.22em; color: var(--ink-400); }

.header-tagline {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--ink-400);
  padding-left: clamp(12px, 2vw, 26px);
  border-left: 1px solid var(--line-600);
  max-width: none;
  white-space: nowrap;
}

.header-actions { margin-left: auto; display: flex; align-items: center; gap: clamp(10px, 1.6vw, 22px); }
.utility-links { display: flex; align-items: center; gap: 18px; }
.utility-link {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-400);
  transition: color 180ms var(--ease);
}
.utility-link:hover { color: var(--cyan-400); }

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 9px 20px;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.18em;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background-color 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease);
}
.btn-primary { background: var(--cyan-400); color: var(--deepspace-950); font-weight: 500; }
.btn-primary:hover { background: var(--ink-100); }
.btn-ghost { border-color: var(--line-600); color: var(--ink-100); }
.btn-ghost:hover { border-color: var(--cyan-400); color: var(--cyan-400); }

/* ---------- 7. Nav toggle ---------- */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--line-600);
  border-radius: 2px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink-100);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan-400); color: var(--cyan-400); }
.nav-toggle-label { line-height: 1; }
.nav-toggle-bars { position: relative; display: block; width: 18px; height: 10px; }
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transition: transform 220ms var(--ease), top 220ms var(--ease), bottom 220ms var(--ease);
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 50%; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { bottom: 50%; transform: rotate(-45deg); }

/* ---------- 8. Navigation（移动端为下拉色板） ---------- */
.site-nav {
  position: fixed;
  top: var(--bar);
  left: 0;
  right: 0;
  z-index: 140;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - var(--bar));
  overflow-y: auto;
  padding: 18px var(--pad) 30px;
  background: rgba(10, 15, 36, 0.98);
  border-bottom: 1px solid var(--line-600);
  visibility: hidden;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 220ms var(--ease), transform 220ms var(--ease), visibility 0s linear 220ms;
}
.site-nav[data-open] {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 220ms var(--ease), transform 220ms var(--ease), visibility 0s;
}

.nav-rail-mark { display: none; }

.nav-list { display: flex; flex-direction: column; margin: 0; }
.nav-item { border-bottom: 1px solid var(--line-600); }
.nav-link {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 2px;
  transition: color 180ms var(--ease);
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--nebula-300);
  font-variant-numeric: tabular-nums;
}
.nav-label { font-size: 17px; letter-spacing: 0.1em; color: var(--ink-100); transition: color 180ms var(--ease); }
.nav-link:hover .nav-label,
.nav-link[aria-current="page"] .nav-label { color: var(--cyan-400); }
.nav-link[aria-current="page"] .nav-index { color: var(--cyan-400); }

.nav-aside { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; margin-top: 22px; }

/* ---------- 9. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 150px);
  background: var(--deepspace-800);
  border-top: 1px solid var(--nebula-500);
  color: var(--ink-400);
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(44px, 7vw, 88px) var(--pad) clamp(30px, 4vw, 52px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
}
.footer-logo {
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 300;
  letter-spacing: 0.24em;
  color: var(--ink-100);
  max-width: none;
}
.footer-tagline {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-400);
  max-width: 26ch;
  line-height: 1.9;
}
.footer-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.footer-col-title {
  margin-bottom: 14px;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.26em;
  color: var(--nebula-300);
}
.footer-links { display: flex; flex-direction: column; gap: 11px; }
.footer-link {
  font-size: 14px;
  color: var(--ink-100);
  transition: color 180ms var(--ease);
}
.footer-link:hover { color: var(--cyan-400); }

.contact-list { display: flex; flex-direction: column; gap: 11px; }
.contact-line {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-100);
  max-width: none;
}
.contact-address { font-size: 13px; line-height: 1.8; color: var(--ink-400); max-width: 32ch; }
.contact-note {
  margin-top: 16px;
  font-size: 12px;
  line-height: 1.9;
  color: var(--ink-400);
  max-width: 34ch;
  padding-top: 14px;
  border-top: 1px solid var(--line-600);
}

.footer-bottom {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px var(--pad) 30px;
  border-top: 1px solid var(--line-600);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-400);
}
.footer-copy, .footer-legal { max-width: none; }
.footer-legal { color: var(--nebula-300); }

/* ---------- 10. Layout ---------- */
main { display: block; }

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.section { padding-top: clamp(56px, 9vw, 120px); }
.section-head { display: flex; flex-direction: column; gap: 12px; }

.index-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--ink-400);
}
.index-label::before { content: ""; width: 26px; height: 1px; background: var(--nebula-500); }

.display-title {
  font-size: clamp(40px, 7vw, 120px);
  font-weight: 200;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ink-100);
}
.section-title {
  font-size: clamp(24px, 3vw, 44px);
  font-weight: 500;
  line-height: 1.22;
  letter-spacing: 0.01em;
}
.lede {
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.85;
  color: var(--ink-400);
  max-width: 42ch;
}
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 300;
  color: var(--amber-400);
  letter-spacing: -0.01em;
}
.band {
  height: 1px;
  margin: clamp(36px, 6vw, 80px) 0;
  background: linear-gradient(90deg, var(--nebula-500), rgba(124, 92, 255, 0));
}

/* ---------- 11. Grid ---------- */
.grid { display: grid; gap: clamp(16px, 2.4vw, 34px); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 12. Cards ---------- */
.solid-card {
  background: var(--deepspace-600);
  border: 1px solid var(--line-600);
  border-radius: 2px;
  padding: clamp(18px, 2vw, 26px);
}
.glass-panel {
  background: var(--glass-layer);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 2px;
  padding: clamp(16px, 2vw, 22px);
}

/* ---------- 13. Media frame ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(140deg, var(--deepspace-600), var(--deepspace-800));
  border: 1px solid var(--line-600);
  border-radius: 2px;
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.82) brightness(0.92);
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--strip { aspect-ratio: 21 / 9; }
.media-frame--full { aspect-ratio: auto; min-height: 40vh; }
.media-frame:empty::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 76% 22%, rgba(124, 92, 255, 0.28), transparent 58%),
    radial-gradient(circle at 18% 82%, rgba(47, 227, 212, 0.16), transparent 62%),
    repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 24px);
}
.media-frame figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ink-100);
  background: linear-gradient(transparent, rgba(4, 6, 14, 0.88));
}
.media-frame > .glass-panel { position: absolute; }

/* ---------- 14. Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-400);
  border: 1px solid var(--line-600);
  border-radius: 999px;
}
.tag-accent { border-color: var(--cyan-400); color: var(--cyan-400); }
.tag-amber { border-color: var(--amber-400); color: var(--amber-400); }

/* ---------- 15. Timeline ---------- */
.timeline { display: flex; flex-direction: column; }
.timeline-item {
  position: relative;
  padding-left: 28px;
  padding-bottom: clamp(24px, 3vw, 40px);
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--deepspace-950);
  border: 1px solid var(--cyan-400);
}
.timeline-item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 28px;
  bottom: 0;
  width: 1px;
  background: var(--line-600);
}
.timeline-item:last-child::after { display: none; }
.timeline-item[data-active]::before {
  animation: node-breathe 1.2s ease-in-out infinite;
}
@keyframes node-breathe {
  0% { box-shadow: 0 0 0 0 rgba(47, 227, 212, 0.55); }
  70% { box-shadow: 0 0 0 10px rgba(47, 227, 212, 0); }
  100% { box-shadow: 0 0 0 0 rgba(47, 227, 212, 0); }
}

/* ---------- 16. Tabs ---------- */
.ui-tabs { display: block; }
.ui-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(14px, 2vw, 30px);
  border-bottom: 1px solid var(--line-600);
  margin-bottom: clamp(20px, 3vw, 34px);
}
.ui-tab {
  position: relative;
  padding: 10px 2px 14px;
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--ink-400);
  transition: color 180ms var(--ease);
}
.ui-tab::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
  transition: background-color 200ms var(--ease);
}
.ui-tab:hover { color: var(--ink-100); }
.ui-tab[aria-selected="true"] { color: var(--cyan-400); }
.ui-tab[aria-selected="true"]::after { background: var(--cyan-400); }
.ui-panel { padding-top: 4px; }
.ui-panel:focus-visible { outline-offset: 6px; }

/* ---------- 17. Accordion ---------- */
.accordion { border-top: 1px solid var(--line-600); }
.accordion-item { border-bottom: 1px solid var(--line-600); }
.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 2px;
  text-align: left;
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--ink-100);
  transition: color 180ms var(--ease);
}
.accordion-trigger:hover { color: var(--cyan-400); }
.accordion-mark { position: relative; flex: 0 0 auto; width: 14px; height: 14px; }
.accordion-mark::before,
.accordion-mark::after { content: ""; position: absolute; background: currentColor; }
.accordion-mark::before { top: 6px; left: 0; width: 14px; height: 1px; }
.accordion-mark::after {
  left: 6px;
  top: 0;
  width: 1px;
  height: 14px;
  transition: transform 240ms var(--ease);
}
.accordion-trigger[aria-expanded="true"] .accordion-mark::after { transform: scaleY(0); }
.accordion-panel { padding: 0 2px 24px; }
.accordion-panel > * { animation: panel-in 240ms var(--ease) both; }
@keyframes panel-in {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 18. Breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  padding-top: clamp(24px, 3vw, 42px);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-400);
}
.breadcrumb-link { color: var(--ink-400); transition: color 180ms var(--ease); }
.breadcrumb-link:hover { color: var(--cyan-400); }
.breadcrumb-sep { color: var(--line-600); }
.breadcrumb-current { color: var(--ink-100); }

/* ---------- 19. Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 20. Tablet ---------- */
@media (min-width: 760px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); }
  .footer-contact { grid-column: 1 / -1; }
}
@media (max-width: 1023px) {
  .header-tagline,
  .utility-links,
  .header-cta { display: none; }
}

/* ---------- 21. Desktop：导航成为页面左侧边框 ---------- */
@media (min-width: 1024px) {
  main { padding-left: var(--rail); }

  .header-bar { margin-left: var(--rail); }

  .nav-toggle { display: none; }
  .nav-aside { display: none; }

  .site-nav {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: auto;
    width: var(--rail);
    max-height: none;
    overflow-y: auto;
    overscroll-behavior: contain;
    align-items: center;
    padding: 16px 0 18px;
    background: var(--deepspace-950);
    border-right: 1px solid var(--line-600);
    border-bottom: 0;
    visibility: visible;
    opacity: 1;
    transform: none;
    transition: none;
    z-index: 160;
  }
  .site-nav[data-open] { transform: none; }

  .nav-rail-mark {
    display: block;
    writing-mode: vertical-rl;
    font-size: 11px;
    letter-spacing: 0.34em;
    color: var(--nebula-300);
    padding-bottom: 14px;
    border-bottom: 1px solid var(--line-600);
  }

  .nav-list {
    margin: auto 0;
    width: 100%;
    align-items: center;
    gap: 6px;
  }
  .nav-item { border-bottom: 0; }
  .nav-link {
    position: relative;
    flex-direction: column;
    align-items: center;
    gap: 7px;
    padding: 11px 0;
    width: 100%;
  }
  .nav-index { font-size: 10px; letter-spacing: 0.1em; }
  .nav-label {
    writing-mode: vertical-rl;
    text-orientation: upright;
    font-size: 12px;
    line-height: 1;
    letter-spacing: 0.2em;
  }
  .nav-link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 12px;
    top: 50%;
    width: 2px;
    height: 18px;
    transform: translateY(-50%);
    background: var(--cyan-400);
  }

  .footer-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr) minmax(0, 1.2fr); }
  .footer-contact { grid-column: auto; }
  .footer-inner { padding-left: calc(var(--pad) + var(--rail)); }
  .footer-bottom { padding-left: calc(var(--pad) + var(--rail)); }
}

/* ---------- 22. Small screens ---------- */
@media (max-width: 719px) {
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 18px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ---------- 23. 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;
  }
  .frame-progress { transition: none; }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
}