:root{--color-primary: #006eff;--color-primary-hover: #3385ff;--color-primary-light: #e6f0ff;--color-text: #333333;--color-text-secondary: #666666;--color-text-muted: #999999;--color-border: #e5e5e5;--color-bg: #ffffff;--color-bg-alt: #f7f8fa;--color-bg-dark: #1a1a2e;--space-xs: 8px;--space-sm: 16px;--space-md: 24px;--space-lg: 40px;--space-xl: 64px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .1);--transition-fast: .2s ease;--transition-normal: .3s ease;--header-height: 64px;--container-max: 1200px;--font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-sans);font-size:16px;line-height:1.6;color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}button{font-family:inherit;cursor:pointer}.container{width:100%;max-width:var(--container-max);margin:0 auto;padding-left:var(--space-md);padding-right:var(--space-md)}.section-title{font-size:28px;font-weight:600;color:var(--color-text);margin-bottom:var(--space-sm);letter-spacing:.02em}.section-subtitle{font-size:15px;color:var(--color-text-secondary);max-width:560px;margin-bottom:var(--space-lg)}@media (max-width: 768px){.section-title{font-size:22px}.section-subtitle{font-size:14px}}