:root{--bg: #ffffff;--bg-alt: #f5f8fc;--surface: #ffffff;--primary: #1d4ed8;--primary-dark: #1e3a8a;--accent: #2563eb;--indigo: #6366f1;--cyan: #06b6d4;--grad: linear-gradient(120deg, #1d4ed8 0%, #4f46e5 50%, #06b6d4 100%);--grad-soft: linear-gradient(135deg, rgba(29, 78, 216, .12), rgba(99, 102, 241, .1) 55%, rgba(6, 182, 212, .1));--text: #0f172a;--text-muted: #64748b;--border: #e6ebf3;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);--shadow: 0 10px 30px rgba(15, 23, 42, .08);--shadow-lg: 0 20px 48px rgba(29, 78, 216, .16);--radius: 16px;--radius-sm: 10px;--maxw: 1140px;--header-h: 68px;--transition: .28s cubic-bezier(.22, 1, .36, 1)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 12px)}body{margin:0;font-family:PingFang SC,Microsoft YaHei,Source Han Sans CN,-apple-system,BlinkMacSystemFont,Segoe 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