:root{--bg:#f5f7fb;--surface:#fff;--text:#171b26;--text-soft:#5b6472;--line:#e3e7ef;--primary:#2f6bff;--primary-dark:#1b3a8f;--primary-soft:#2f6bff14;--radius:14px;--radius-sm:10px;--shadow:0 1px 2px #0f172a0a, 0 12px 32px #0f172a0f;--container:1120px;--font:"Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif}*,:before,:after{box-sizing:border-box}[hidden]{display:none!important}html{scroll-behavior:smooth}body{font-family:var(--font);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;margin:0;line-height:1.6}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}h1,h2,h3,h4{letter-spacing:-.01em;margin:0;line-height:1.25}p{margin:0}.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}.muted{color:var(--text-soft)}.site-header{z-index:20;backdrop-filter:saturate(180%)blur(12px);border-bottom:1px solid var(--line);background:#ffffffd1;position:sticky;top:0}.site-header__inner{align-items:center;gap:16px;min-height:64px;display:flex}.brand{align-items:center;gap:10px;min-width:0;font-size:17px;font-weight:650;display:flex}.brand img{object-fit:cover;border-radius:9px;width:32px;height:32px}.brand span{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.site-nav{color:var(--text-soft);align-items:center;gap:22px;margin-left:12px;font-size:14px;display:flex}.site-nav a:hover{color:var(--text)}.header-actions{align-items:center;gap:10px;margin-left:auto;display:flex}.btn{min-height:40px;font:inherit;cursor:pointer;border:1px solid #0000;border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:0 18px;font-size:14px;font-weight:600;transition:transform .12s,background .16s,border-color .16s,color 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