*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color:#2563eb;--secondary-color:#1e40af;--accent-color:#3b82f6;--text-primary:#1f2937;--text-secondary:#6b7280;--background-light:#f8fafc;--background-white:#ffffff;--border-color:#e5e7eb;--shadow-light:0 1px 3px rgba(0,0,0,0.1);--shadow-medium:0 4px 6px rgba(0,0,0,0.1);--shadow-large:0 10px 15px rgba(0,0,0,0.1);--gradient-primary:linear-gradient(135deg,#667eea 0%,#764ba2 100%);--gradient-secondary:linear-gradient(135deg,#f093fb 0%,#f5576c 100%)}body{font-family:'PingFang SC','Helvetica Neue',Arial,sans-serif;line-height:1.6;color:var(--text-primary);background-color:var(--background-white);scroll-behavior:smooth}.container{max-width:1200px;margin:0 auto;padding:0 20px}.navbar{position:fixed;top:0;width:100%;background:rgba(255,255,255,0.95);backdrop-filter:blur(10px);box-shadow:var(--shadow-light);z-index:1000;transition:all 0.3s ease}.nav-container{max-width:1200px;margin:0 auto;padding:0 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