:root{--font-sans:"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;--color-primary:#667eea;--color-primary-hover:#5a6fd8;--color-primary-soft:#eef1ff;--text:#333;--text-muted:#666;--surface:#ffffff;--surface-soft:#f7f8ff;--border-subtle:#e3e7f5;--page-bg-fallback:#f3f5ff;--page-bg:linear-gradient(135deg, #9f95d8 0%, #f3d1ef 100%);--radius-md:8px;--radius-lg:12px;--shadow-card:0 4px 18px rgba(102, 126, 234, 0.12)}