:root{
  /* 默认（浅色）主题变量 */
  --bg:#f7f8fb;--card:#ffffff;--border:rgba(0,0,0,.08);--muted:#475569;--text:#0f172a;--link:#2563eb;--brand:#3b82f6;--brand-2:#06b6d4;--radius:16px;--shadow:0 10px 30px rgba(0,0,0,.06)
}
:root.dark{
  /* 深色主题变量 */
  --bg:#0b0f19;--card:#121826;--border:rgba(255,255,255,.10);--muted:#a3adcc;--text:#e6e9f5;--link:#60a5fa;--brand:#4f8cff;--brand-2:#6ee7f9;--shadow:0 10px 30px rgba(0,0,0,.35)
}
/* 跟随系统 */
@media (prefers-color-scheme: dark){ :root.auto{color-scheme:dark} }
@media (prefers-color-scheme: light){ :root.auto{color-scheme:light} }

*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"PingFang SC","Noto Sans CJK SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}
.container{max-width:1100px;margin:0 auto;padding:20px}
.muted{color:var(--muted)}

/* Header */
.site-header{position:sticky;top:0;backdrop-filter:saturate(180%) blur(8px);background:color-mix(in oklab, var(--bg) 85%, transparent);border-bottom:1px solid var(--border);z-index:50}
.nav{display:flex;align-items:center;justify-content:space-between;padding:12px 8px}
.logo{display:flex;align-items:center;gap:10px;color:inherit;text-decoration:none}
.top-links{display:flex;gap:14px;align-items:center}
.top-links a{color:var(--text);text-decoration:none;opacity:.9}
.top-links a:hover{opacity:1}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 14px;border-radius:12px;border:1px solid var(--border);background:transparent;color:var(--text);text-decoration:none}
.btn.primary{border:none;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-weight:700;box-shadow:var(--shadow)}
.btn.ghost{border:1px solid var(--border);background:transparent}
.row-gap{display:flex;gap:12px;flex-wrap:wrap}

/* Hero */
.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:center;padding:40px 8px}
.hero h1{font-size:42px;line-height:1.15;margin:0 0 12px}
.tags{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0 0}
.tag{padding:6px 10px;border:1px solid var(--border);border-radius:999px;color:var(--muted);font-size:12px}
.hero-illus{padding:10px}
.illus-box{height:300px;border-radius:16px;background:linear-gradient(160deg,color-mix(in oklab, var(--brand) 15%, transparent),color-mix(in oklab, var(--brand-2) 12%, transparent));border:1px dashed var(--border);display:grid;place-items:center;color:var(--muted)}

/* Cards, sections */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.pad{padding:18px}
section{padding:28px 8px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feature{padding:18px}
.posts .post{padding:18px}
.meta{font-size:12px;color:var(--muted);margin:6px 0 10px}
.about{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.notice{font-size:12px;color:var(--muted)}

/* Article */
.post-article{line-height:1.75}
.post-article h1{margin:0 0 8px}
.post-article .content img{max-width:100%;border-radius:12px}

/* Footer */
.site-footer{padding:24px 8px;border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center}
.icp a{color:var(--muted);text-decoration:none}
.icp a:hover{text-decoration:underline}

/* Responsive */
@media (max-width: 900px){
  .hero{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr}
  .about{grid-template-columns:1fr}
}