:root{--bg:#05070d;--panel:#0b1120;--line:#1e2f4a;--cyan:#33f4ff;--purple:#8d5cff;--text:#eaf7ff;--muted:#9fb0c6;--card:#0e1629}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 20% 0,#10264a 0,#05070d 45%,#03050a 100%);color:var(--text);font-family:"Microsoft YaHei",Arial,sans-serif;line-height:1.75}.grid-bg{position:fixed;inset:0;background-image:linear-gradient(rgba(51,244,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(141,92,255,.06) 1px,transparent 1px);background-size:42px 42px;pointer-events:none;z-index:-1}.site-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:16px 5vw;background:rgba(5,7,13,.86);backdrop-filter:blur(14px);border-bottom:1px solid rgba(51,244,255,.16)}.logo{font-size:26px;font-weight:800;color:#fff;text-decoration:none}.logo span{color:var(--cyan);text-shadow:0 0 18px var(--cyan)}.nav{display:flex;gap:18px;flex-wrap:wrap}.nav 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