/* 四季体育 · 全站共享样式 /assets/site.css */

:root {
  --site-bg: #0A0E1A;
  --card-bg: rgba(18, 24, 41, 0.72);
  --float-bg: #1A2333;
  --accent: #2AFF6B;
  --accent-rgb: 42, 255, 107;
  --accent-invert: #05130B;
  --accent-warm: #FF4D2E;
  --accent-warm-rgb: 255, 77, 46;
  --text-main: #F0F4FF;
  --text-sub: #93A1C4;
  --line: #2B3850;
  --line-soft: rgba(43, 56, 80, 0.5);
  --grid-line: rgba(42, 255, 107, 0.03);
  --header-bg: rgba(10, 14, 26, 0.86);
  --header-top-bg: rgba(26, 35, 51, 0.9);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Code", Consolas, "Liberation Mono", monospace;
}

:root[data-theme="light"] {
  --site-bg: #F5F7FA;
  --card-bg: rgba(255, 255, 255, 0.8);
  --float-bg: #FFFFFF;
  --accent: #16A454;
  --accent-rgb: 22, 164, 84;
  --accent-invert: #FFFFFF;
  --accent-warm: #E84A2A;
  --accent-warm-rgb: 232, 74, 42;
  --text-main: #0E1524;
  --text-sub: #4A5A77;
  --line: #C7D0DF;
  --line-soft: rgba(199, 208, 223, 0.8);
  --grid-line: rgba(16, 42, 80, 0.05);
  --header-bg: rgba(245, 247, 250, 0.88);
  --header-top-bg: rgba(255, 255, 255, 0.92);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 130px; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--site-bg);
  background-image:
    radial-gradient(circle at 8% 4%, rgba(var(--accent-rgb), 0.08), transparent 34%),
    radial-gradient(circle at 92% 8%, rgba(var(--accent-warm-rgb), 0.06), transparent 32%),
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 { font-weight: 800; line-height: 1.25; color: var(--text-main); }
p { margin-top: 0; }
a { color: var(--accent); }
ul, ol { margin: 0; padding-left: 1.4em; }
button { font-family: inherit; }
img, svg, video { max-width: 100%; height: auto; display: block; }
::selection { background: var(--accent); color: var(--accent-invert); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.site-container { width: calc(100% - 40px); max-width: 1280px; margin-inline: auto; }

.page-section { padding: 64px 0; }
.page-section--tight { padding: 40px 0; }

.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 32px; }
.section-title { font-size: clamp(26px, 3.2vw, 38px); margin: 0; letter-spacing: 0.01em; }
.section-title::before { content: "//"; color: var(--accent); font-family: var(--font-mono); margin-right: 10px; font-weight: 700; }
.section-desc { color: var(--text-sub); margin: 8px 0 0; font-size: 15px; max-width: 56ch; }

.breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 20px 0 4px; color: var(--text-sub); font-size: 13px; }
.breadcrumbs a { color: var(--text-sub); text-decoration: none; transition: color .18s ease; }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs-sep { color: var(--line); font-family: var(--font-mono); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 26px; border-radius: var(--radius-md); border: 1px solid transparent; font-weight: 700; font-size: 15px; line-height: 1.2; text-decoration: none; cursor: pointer; transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease, border-color .18s ease; }
.btn-primary { background: var(--accent); color: var(--accent-invert); box-shadow: 0 4px 14px rgba(var(--accent-rgb), 0.2); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(var(--accent-rgb), 0.3); }
.btn-ghost { background: transparent; color: var(--text-main); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); background: rgba(var(--accent-rgb), 0.06); }

.tag { display: inline-flex; align-items: center; gap: 6px; padding: 3px 12px; border-radius: 999px; background: rgba(var(--accent-rgb), 0.08); border: 1px solid rgba(var(--accent-rgb), 0.28); color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: 0.02em; white-space: nowrap; }

.data-card { position: relative; background: var(--card-bg); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); transition: transform .2s ease, border-color .2s ease, background .2s ease; }
.data-card:hover { transform: translateY(-3px); border-color: rgba(var(--accent-rgb), 0.5); background: rgba(var(--accent-rgb), 0.04); }

.stat-value { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-weight: 800; font-size: clamp(26px, 3.4vw, 42px); line-height: 1.1; color: var(--text-main); letter-spacing: -0.02em; }
.stat-value .stat-unit { font-size: 0.45em; color: var(--accent); font-weight: 700; margin-left: 3px; }
.stat-label { display: block; margin-top: 6px; font-size: 13px; color: var(--text-sub); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.grid-bento { display: grid; grid-template-columns: repeat(12, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

.media-frame { position: relative; overflow: hidden; border-radius: var(--radius-lg); border: 1px solid var(--line); aspect-ratio: 16 / 9; background: linear-gradient(135deg, var(--float-bg) 0%, var(--card-bg) 100%); }
.media-frame::after { content: ''; position: absolute; inset: 0; background: linear-gradient(rgba(var(--accent-rgb), 0.07) 1px, transparent 1px), radial-gradient(circle at 20% 40%, rgba(var(--accent-rgb), 0.18), transparent 40%); background-size: 100% 24px, auto; opacity: 0.5; pointer-events: none; }
.media-frame--portrait { aspect-ratio: 4 / 5; }

.prose { color: var(--text-sub); font-size: 16px; line-height: 2; max-width: 760px; }
.prose p { margin-bottom: 1.2em; }
.prose h2 { font-size: 24px; margin: 2.2em 0 0.6em; color: var(--text-main); }
.prose h3 { font-size: 19px; margin: 2em 0 0.5em; color: var(--text-main); }
.prose a { color: var(--accent); }
.prose ul, .prose ol { margin-bottom: 1.2em; }

.scanline { position: relative; overflow: hidden; }
.scanline::before { content: ''; position: absolute; left: 0; right: 0; top: -60%; height: 220%; background: linear-gradient(to bottom, transparent 0%, rgba(var(--accent-rgb), 0.07) 50%, transparent 100%); pointer-events: none; animation: scan-move 7s linear infinite; }
@keyframes scan-move { 0% { transform: translateY(-40%); } 100% { transform: translateY(45%); } }

.site-skip { position: absolute; left: -9999px; top: 0; z-index: 300; padding: 10px 18px; background: var(--accent); color: var(--accent-invert); font-weight: 800; font-size: 14px; text-decoration: none; border-radius: 0 0 10px 0; }
.site-skip:focus { left: 0; color: var(--accent-invert); }

.site-header { position: sticky; top: 0; z-index: 120; background: var(--header-bg); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--line-soft); }

.progress-track { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 240; pointer-events: none; }
.progress-bar { display: block; width: 0; height: 100%; background: var(--accent); box-shadow: 0 0 10px rgba(var(--accent-rgb), 0.7); }

.header-topline { background: var(--header-top-bg); border-bottom: 1px solid var(--line-soft); }
.header-topline-inner { display: flex; align-items: center; gap: 16px; min-height: 36px; }
.brand-statement { margin: 0; font-size: 12px; letter-spacing: 0.04em; color: var(--text-sub); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.header-tools { display: flex; align-items: center; gap: 10px; margin-left: auto; flex-shrink: 0; }
.update-badge { display: inline-flex; align-items: center; gap: 7px; padding: 3px 12px; border-radius: 999px; font-size: 12px; font-weight: 800; color: var(--accent); background: rgba(var(--accent-rgb), 0.1); border: 1px solid rgba(var(--accent-rgb), 0.3); letter-spacing: 0.03em; }
.update-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); animation: update-pulse 2.2s ease-in-out infinite; }
@keyframes update-pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(0.72); } }

.theme-switch { position: relative; width: 42px; height: 24px; border-radius: 999px; background: var(--float-bg); border: 1px solid var(--line); cursor: pointer; padding: 0; }
.theme-switch-icon { position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 6px rgba(var(--accent-rgb), 0.5); transition: transform .25s ease, background .25s ease; }
:root[data-theme="light"] .theme-switch-icon { transform: translateX(18px); background: var(--accent-warm); box-shadow: 0 0 6px rgba(var(--accent-warm-rgb), 0.5); }

.header-main { position: relative; }
.header-main-inner { display: flex; align-items: center; gap: 28px; min-height: 76px; }

.brand-logo { display: inline-flex; align-items: center; gap: 12px; flex-shrink: 0; text-decoration: none; color: var(--text-main); white-space: nowrap; }
.brand-mark { flex-shrink: 0; width: 24px; height: 24px; background-image: radial-gradient(circle, var(--accent) 0 2px, transparent 2.6px); background-repeat: no-repeat; background-size: 4px 4px; background-position: 0 0, 8px 0, 16px 0, 0 8px, 16px 8px, 0 16px, 8px 16px, 16px 16px; filter: drop-shadow(0 0 4px rgba(var(--accent-rgb), 0.5)); }
.brand-wordmark { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 21px; font-weight: 800; letter-spacing: 0.03em; }
.brand-domain { font-size: 10px; color: var(--text-sub); font-family: var(--font-mono); letter-spacing: 0.08em; }

.site-nav { margin-left: auto; }
.nav-list { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0; padding: 0; }
.nav-link { display: inline-block; padding: 10px 15px; border-radius: var(--radius-sm); color: var(--text-sub); font-weight: 700; font-size: 15px; text-decoration: none; transition: color .18s ease, background .18s ease; }
.nav-link:hover { color: var(--text-main); background: var(--float-bg); }
.nav-link[aria-current="page"] { color: var(--accent); background: rgba(var(--accent-rgb), 0.09); }

.nav-toggle { display: none; flex-direction: column; align-items: center; justify-content: center; gap: 5px; width: 44px; height: 44px; margin-left: auto; background: var(--float-bg); border: 1px solid var(--line); border-radius: 10px; cursor: pointer; padding: 0; }
.nav-toggle-bar { display: block; width: 20px; height: 2px; border-radius: 2px; background: var(--text-main); transition: transform .22s ease, opacity .22s ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

.site-footer { position: relative; margin-top: 96px; background: var(--float-bg); border-top: 1px solid var(--line); overflow: hidden; }
.site-footer::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--accent) 0%, var(--accent-warm) 55%, var(--accent) 110%); }
.footer-grid { display: grid; grid-template-columns: 2fr 1.2fr 1fr 1.4fr; gap: 44px; padding: 56px 0 40px; }
.footer-brand { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; }
.footer-statement { margin: 0; color: var(--text-sub); font-size: 14px; line-height: 1.9; max-width: 34ch; }
.footer-rank { margin: 0; display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-main); font-weight: 600; }
.footer-column { display: flex; flex-direction: column; gap: 6px; }
.footer-heading { margin: 0 0 6px; font-size: 12px; font-weight: 800; letter-spacing: 0.14em; color: var(--text-sub); text-transform: uppercase; }
.footer-links { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-links a { display: inline-flex; align-items: center; gap: 6px; color: var(--text-sub); font-size: 14px; text-decoration: none; transition: color .18s ease; }
.footer-links a::before { content: '▸'; color: var(--accent); font-size: 11px; opacity: 0; transform: translateX(-4px); transition: opacity .18s ease, transform .18s ease; }
.footer-links a:hover { color: var(--text-main); }
.footer-links a:hover::before { opacity: 1; transform: translateX(0); }
.footer-contact { display: flex; flex-direction: column; gap: 10px; }
.contact-line { margin: 0; color: var(--text-sub); font-size: 14px; }
.contact-line:first-of-type { font-family: var(--font-mono); }
.footer-note { margin: 10px 0 0; font-size: 12px; color: var(--text-sub); opacity: 0.85; line-height: 1.7; }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; padding: 16px 0 22px; border-top: 1px solid var(--line); }
.copyright { margin: 0; font-size: 13px; color: var(--text-sub); }
.footer-legal { margin: 0; font-size: 13px; color: var(--text-sub); font-family: var(--font-mono); }

[data-reveal] { opacity: 0; transform: translateY(18px); }
[data-reveal].is-visible { animation: reveal-in .6s ease both; animation-delay: var(--reveal-delay, 0s); }
@keyframes reveal-in { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }
  .site-nav { display: block; position: absolute; top: 100%; left: 0; right: 0; background: var(--float-bg); border-bottom: 1px solid var(--line); box-shadow: 0 18px 36px rgba(0, 0, 0, 0.35); max-height: 0; visibility: hidden; overflow: hidden; transition: max-height .3s ease, visibility .3s ease; }
  .site-nav[data-open] { max-height: 480px; visibility: visible; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; padding: 10px 20px 18px; }
  .nav-link { display: block; padding: 14px 8px; border-bottom: 1px solid var(--line-soft); border-radius: 0; font-size: 16px; }
  .nav-link[aria-current="page"] { background: transparent; border-bottom-color: rgba(var(--accent-rgb), 0.45); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .header-main-inner { min-height: 68px; }
}

@media (max-width: 640px) {
  .site-container { width: calc(100% - 32px); }
  .brand-statement { display: none; }
  .header-main-inner { min-height: 60px; gap: 12px; }
  .brand-name { font-size: 18px; }
  .brand-domain { font-size: 9px; }
  .update-badge { padding: 2px 9px; font-size: 11px; }
  .page-section { padding: 44px 0; }
  .footer-grid { grid-template-columns: 1fr; padding: 40px 0 28px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .header-topline-inner { min-height: 32px; }
}

@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; animation: none; }
}