:root{--text:#1d1d1f;--secondary:#6e6e73;--bg:#f5f5f7;--surface:#fff;--border:#d2d2d7;--primary:#0071e3;--success:#248a3d;--warning:#c65d00;--danger:#b42318;--radius:18px;--shadow:0 12px 40px rgba(0,0,0,.07)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.55}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.container{width:min(1240px,calc(100% - 40px));margin:auto}.nav{height:64px;position:sticky;top:0;z-index:30;background:rgba(255,255,255,.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(0,0,0,.07)}.nav-inner{height:100%;display:flex;align-items:center;gap:28px}.brand{font-size:20px;font-weight:750;letter-spacing:-.5px}.brand 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