:root {
  color-scheme: light;
  --page: #eef2f6;
  --surface: #ffffff;
  --surface-soft: #f7f9fb;
  --surface-blue: #f1f7ff;
  --line: #dce4eb;
  --line-strong: #c8d3de;
  --ink: #17212b;
  --ink-soft: #44515d;
  --muted: #596773;
  --accent: #1168d4;
  --accent-dark: #0755b5;
  --accent-soft: #eaf3ff;
  --shadow: 0 8px 24px rgba(24,43,61,.06);
  --shadow-soft: 0 2px 8px rgba(24,43,61,.05);
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html{background:var(--page);scrollbar-gutter:stable}
body{margin:0;color:var(--ink);background:var(--page);font-size:14px;line-height:1.55}
a{color:var(--accent-dark);text-decoration:none;touch-action:manipulation;-webkit-tap-highlight-color:rgba(0,113,227,.18)}
a:hover{color:var(--accent)}
a:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
.app-header{background:var(--surface);border-bottom:1px solid var(--line)}
.app-header-inner,.page-main,.page-footer{width:min(1180px,calc(100% - 48px));margin:0 auto}
.app-header-inner{min-height:66px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.app-brand{min-width:0;display:flex;align-items:center;gap:11px;color:inherit}
.brand-mark{width:36px;height:36px;flex:0 0 36px;display:grid;place-items:center;color:var(--accent);background:var(--accent-soft);border:1px solid #cfe2fa;border-radius:8px;font-size:17px;font-weight:780}
.brand-copy{min-width:0}.brand-copy h1{margin:0;overflow:hidden;font-size:19px;line-height:1.2;text-overflow:ellipsis;white-space:nowrap}.brand-copy p{margin:3px 0 0;color:var(--muted);font-size:12px;line-height:1.35}.header-link{color:var(--muted);font-size:12px;white-space:nowrap}
.page-main{display:grid;gap:14px}.overview{padding-top:14px}.overview-card,.workspace,.language-card,.category-section{background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow)}
.overview-card{padding:20px 22px 18px}.overview-card h2{margin:0;font-size:29px;line-height:1.14;letter-spacing:-.02em}.overview-card>p{max-width:900px;margin:8px 0 0;color:var(--muted);font-size:13px}.overview-stats{margin:18px 0 0;display:flex;flex-wrap:wrap;gap:7px}.overview-stats div{padding:7px 11px;display:inline-flex;align-items:baseline;gap:5px;background:var(--surface-soft);border:1px solid var(--line);border-radius:999px}.overview-stats dt{color:var(--muted);font-size:12px}.overview-stats dd{margin:0;font-size:13px;font-weight:720}
.language-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.language-card{min-width:0;padding:18px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;transition:border-color 150ms ease,background 150ms ease,transform 150ms ease}.language-card:hover{background:var(--surface-blue);border-color:#b9d6f7;transform:translateY(-1px)}.language-card-copy{min-width:0}.language-card h2{margin:0;color:var(--ink);font-size:18px;line-height:1.2}.language-card p{margin:5px 0 0;color:var(--muted);font-size:12px}.language-card-arrow{flex:0 0 auto;color:var(--accent);font-size:22px;line-height:1}
.workspace{overflow:hidden}.workspace-toolbar{padding:16px 20px;display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line)}.workspace-heading h2{margin:0;font-size:19px}.workspace-heading p{margin:5px 0 0;color:var(--muted);font-size:12px}.workspace-summary{padding:11px 18px;color:var(--muted);background:var(--surface-soft);font-size:12px;border-bottom:1px solid var(--line)}
.category-list{display:grid;gap:12px}.category-section{overflow:hidden}.category-header{padding:13px 18px;display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--surface-soft);border-bottom:1px solid var(--line)}.category-header h2{margin:0;font-size:15px;line-height:1.25}.category-count{color:var(--muted);font-size:11px;white-space:nowrap}.sample-list{margin:0;padding:0;list-style:none}.sample-item{display:grid;grid-template-columns:42px minmax(0,1fr);gap:12px;align-items:start;padding:15px 18px;border-bottom:1px solid #e5ebf0}.sample-item:last-child{border-bottom:0}.sample-index{width:30px;height:30px;display:grid;place-items:center;color:var(--accent-dark);background:var(--accent-soft);border:1px solid #cfe2fa;border-radius:7px;font-size:11px;font-weight:780;font-variant-numeric:tabular-nums}.sample-text{margin:1px 0 0;color:var(--ink);font-size:16px;line-height:1.65;overflow-wrap:anywhere}.sample-text code{padding:1px 4px;background:#edf2f6;border:1px solid #dbe4ec;border-radius:4px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92em}
.test-nav{display:flex;align-items:center;flex-wrap:wrap;gap:7px}.test-nav a{padding:6px 9px;color:var(--muted);background:var(--surface-soft);border:1px solid var(--line);border-radius:6px;font-size:11px}.test-nav a[aria-current="page"]{color:var(--accent-dark);background:var(--accent-soft);border-color:#cfe2fa;font-weight:720}.workspace-footer{padding:11px 18px;color:var(--muted);background:var(--surface-soft);border-top:1px solid var(--line);font-size:12px}.workspace-footer p{margin:0}.page-footer{margin-top:20px;margin-bottom:28px;color:var(--muted);font-size:12px;text-align:center}.page-footer p{margin:3px 0}
@media(max-width:900px){.language-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.workspace-toolbar{align-items:flex-start;flex-direction:column}.test-nav{width:100%}}
@media(max-width:640px){.app-header-inner,.page-main,.page-footer{width:min(100% - 24px,1180px)}.app-header-inner{min-height:74px;padding:9px 0;align-items:flex-start;flex-direction:column;gap:5px}.brand-copy h1{font-size:17px}.header-link{padding-left:47px}.overview{padding-top:12px}.overview-card{padding:17px 15px 15px}.overview-card h2{font-size:25px}.language-grid{grid-template-columns:1fr;gap:10px}.language-card{padding:16px}.workspace-toolbar{padding:14px 12px}.workspace-summary{padding:10px 12px}.category-list{gap:10px}.category-header{padding:12px}.sample-item{grid-template-columns:36px minmax(0,1fr);gap:9px;padding:13px 12px}.sample-index{width:28px;height:28px}.sample-text{font-size:16px}.test-nav{gap:5px}.test-nav a{padding:6px 8px}.page-footer{margin-top:16px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important}.language-card:hover{transform:none}}