:root{--font-sans: Roboto, Helvetica, Arial, sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Ubuntu, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft Yahei UI", "Microsoft Yahei", "Source Han Sans CN";--color-bg: #dfdfdf;--color-surface: #ffffff;--color-surface-muted: #f3f4f6;--color-sidebar: #f3f3f3;--color-border: #dee1e6;--color-divider: #eaecf0;--color-text: #111827;--color-text-secondary: #6b7280;--color-text-muted: #9095a1;--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-primary-contrast: #ffffff;--color-accent: #ff8c00;--color-error: #db4437;--color-success: #008000;--color-cta: #e11d2e;--color-cta-hover: #c81830;--color-cta-soft: #fde7ea;--radius-control: 8px;--radius-input: 12px;--radius-panel: 16px;--radius-chip: 999px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;--space-7: 40px;--space-8: 48px;--shadow-card: 0 10px 30px rgba(0, 0, 0, .08);--shadow-button-hover: 0 8px 18px rgba(225, 29, 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