:root{--background:#f4f8ff;--foreground:#13214a;--muted:#edf4ff;--muted-strong:#dce7f6;--panel:#fff;--border:#dbe5f4;--primary:#3476ff;--primary-dark:#2358cf;--accent:#19b983;--danger:#dc2626;--shadow:0 24px 80px rgba(27,49,88,.08)}*{box-sizing:border-box}html{min-width:320px}body{margin:0;background:radial-gradient(circle at 16% 4%,rgba(72,133,255,.13),transparent 28%),radial-gradient(circle at 86% 10%,rgba(70,214,176,.12),transparent 24%),linear-gradient(180deg,#f8fbff 0,var(--background) 48%,#eef5ff 100%);color:var(--foreground);font-family:Inter,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Arial,Helvetica,sans-serif;font-size:16px;min-height:100vh}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed}:focus-visible{outline:3px solid var(--primary);outline-offset:3px}