:root{--primary-color: #0066cc;--primary-hover: #0052a3;--secondary-color: #00a8e8;--accent-color: #ff6b35;--text-primary: #1a1a1a;--text-secondary: #666666;--text-light: #999999;--text-white: #ffffff;--bg-primary: #ffffff;--bg-secondary: #f8f9fa;--bg-dark: #1a1a1a;--bg-overlay: rgba(0,0,0,.5);--border-color: #e0e0e0;--border-radius: 8px;--shadow-sm: 0 2px 4px rgba(0,0,0,.1);--shadow-md: 0 4px 8px rgba(0,0,0,.15);--shadow-lg: 0 8px 16px rgba(0,0,0,.2);--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;--font-size-base: 16px;--font-size-sm: 14px;--font-size-lg: 18px;--font-size-xl: 24px;--font-size-xxl: 32px;--spacing-xs: 8px;--spacing-sm: 16px;--spacing-md: 24px;--spacing-lg: 32px;--spacing-xl: 48px;--spacing-xxl: 64px;--transition: all .3s ease}*{box-sizing:border-box;margin:0;padding:0}html{font-size:var(--font-size-base);scroll-behavior:smooth}body{font-family:var(--font-family);color:var(--text-primary);background:var(--bg-primary);line-height:1.6;min-height:100vh}a{color:var(--primary-color);text-decoration:none;transition:var(--transition)}a:hover{color:var(--primary-hover)}img{max-width:100%;display:block;height:auto}button{font-family:var(--font-family);cursor:pointer;border:none;background:none;transition:var(--transition)}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}.container-fluid{width:100%;padding:0 var(--spacing-md)}.app-wrapper{display:flex;flex-direction:column;min-height:100vh}#main-content{flex:1}.hidden{display:none!important}.text-center{text-align:center}.text-right{text-align:right}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.btn{display:inline-block;padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--border-radius);font-weight:600;text-align:center}.btn-primary{background:var(--accent-color);color:var(--text-white)}.btn-primary:hover{background:#e55a2b;transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn-secondary{background:transparent;color:var(--primary-color);border:2px solid var(--primary-color)}.btn-secondary:hover{background:var(--primary-color);color:var(--text-white)}.btn-sm{padding:8px 16px;font-size:var(--font-size-sm)}body.high-contrast{color:#fff;background:#000}body.high-contrast a{color:#ff0}body.high-contrast .btn-primary{background:#ff0;color:#000}@media(max-width:768px){:root{--font-size-base: 14px;--spacing-sm: 12px;--spacing-md: 16px;--spacing-lg: 24px}.container{padding:0 var(--spacing-sm)}}@media print{header,footer,.no-print{display:none}}