:root {--font-sans: "Microsoft YaHei", "PingFang SC", sans-serif;--text-body: 16px;--text-hero: 42px;--text-h1: 36px;--text-h2: 32px;--text-h3: 28px;--text-h4: 20px;--text-logo: 24px;--text-small: 14px;--text-caption: 13px;--text-stat: 36px;--leading-body: 1.8;--tracking-title: 2px;--space-nav: 30px;--space-section-top: 60px;--space-title-gap: 40px;--space-section: 80px;--space-hero: 100px;--space-page-hero: 80px;--space-footer: 60px;--space-footer-end: 30px;--space-card: 30px;--space-card-y: 40px;--space-card-x: 20px;--space-grid-s: 20px;--space-grid-m: 30px;--space-grid-l: 40px;--space-grid-xl: 50px;--space-header: 80px;--content-width: 1200px;--radius-sm: 4px;--radius-md: 8px;--line-width: 60px;--line-height: 3px;--shadow-header: 0 2px 10px rgba(0,0,0,0.1);--shadow-card: 0 10px 25px rgba(0,0,0,0.08);--shadow-soft: 0 4px 15px rgba(0,0,0,0.03);}