:root{--background: #ffffff;--foreground: oklch(.145 0 0);--card: #ffffff;--muted: #ececf0;--muted-foreground: #717182;--border: rgba(0, 0, 0, .1);--input-background: #f3f3f5;--brand: #1c93e0;--brand-light: #5bb8ff;--brand-ink: #16537a;--brand-tint: #e3f0fa;--brand-line: #c7e1f5;--brand-soft: #eaf4fd;--brand-gradient: linear-gradient(135deg, #5bb8ff, #1c93e0);--mark-gradient: linear-gradient(135deg, #5bb8ff, #1c93e0);--brand-shadow: 0 12px 30px rgba(28, 147, 224, .36);--ink: #26251f;--muted-ink: #6b6a62;--ground: #f4f7f9;--cardline: #e9ecf0}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:#f6f6f9;color:var(--foreground);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}button{font-family:inherit}.language-switcher{min-width:68px;height:38px;padding:0 13px;border:1px solid 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