:root{--navy:#020d22;--navy2:#071a3b;--panel:#09244d;--line:rgba(126,178,241,.22);--gold:#f3be57;--blue:#2878ff;--green:#39d49d;--text:#f7faff;--muted:#9db0cd;--radius:8px;--max:1240px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--navy);color:var(--text);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;letter-spacing:0}a{color:inherit;text-decoration:none}button,select,input,textarea{font:inherit}.container{width:min(var(--max),calc(100% - 40px));margin:auto}.site-header{height:68px;position:sticky;top:0;z-index:50;background:rgba(2,13,34,.92);border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}.header-inner{height:100%;display:flex;align-items:center;gap:30px}.brand{display:flex;align-items:center;gap:10px;min-width:190px}.brand img{width:40px;height:40px;border-radius:8px;object-fit:cover}.brand strong{font-size:18px}.brand 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