:root{--brand:#F45132;--brand-hover:#FF684E;--gold:#D7A84B;--ink:#1A1A1A;--text:#333;--muted:#666;--soft:#F6F7F9;--line:#E8EAED}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--text);font-family:system-ui,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8}a{color:inherit;text-decoration:none}a:hover{color:var(--brand)}button{font:inherit;cursor:pointer}.container{width:min(1120px,calc(100% - 48px));margin-inline:auto;min-width:0}.topnav{position:sticky;top:0;z-index:1000;background:#fff;border-bottom:1px solid var(--line)}.header-inner{height:70px;display:flex;align-items:center;gap:20px}.logo{display:flex;align-items:center;gap:7px;min-width:135px;color:#222;font-weight:800;font-size:21px;white-space:nowrap}.logo .media{width:43px;max-height:40px;background:transparent;border:0}.logo .media img{max-height:40px;width:auto}.logo-text 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