:root{--primary-color: #0d47a1;--primary-light: #1976d2;--primary-dark: #0a3d91;--secondary-color: #00acc1;--accent-color: #00bcd4;--success-color: #4caf50;--warning-color: #ff9800;--danger-color: #f44336;--info-color: #2196f3;--text-primary: #212121;--text-secondary: #757575;--text-light: #ffffff;--bg-light: #f5f5f5;--bg-white: #ffffff;--border-color: #e0e0e0;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-xxl: 48px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--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)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:PingFang SC,Microsoft YaHei,Arial,sans-serif;font-size:14px;line-height:1.6;color:var(--text-primary);background-color:var(--bg-light)}a{text-decoration:none;color:inherit}ul,ol{list-style:none}img{max-width:100%;height:auto}.container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}.section{padding:var(--spacing-xxl) 0}.section-title{text-align:center;margin-bottom:var(--spacing-xl)}.section-title h2{font-size:32px;color:var(--primary-color);margin-bottom:var(--spacing-sm)}.section-title p{color:var(--text-secondary);font-size:16px}.btn{display:inline-block;padding:10px 24px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;cursor:pointer;transition:all .3s;border:none}.btn-primary{background-color:var(--primary-color);color:var(--text-light)}.btn-primary:hover{background-color:var(--primary-light)}.btn-secondary{background-color:var(--secondary-color);color:var(--text-light)}.btn-secondary:hover{background-color:var(--accent-color)}.btn-outline{background-color:transparent;border:2px solid var(--primary-color);color:var(--primary-color)}.btn-outline:hover{background-color:var(--primary-color);color:var(--text-light)}.card{background-color:var(--bg-white);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);overflow:hidden;transition:transform .3s,box-shadow .3s}.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}.card-body{padding:var(--spacing-lg)}.grid{display:grid;gap:var(--spacing-lg)}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media (max-width: 992px){.grid-4,.grid-3{grid-template-columns:repeat(2,1fr)}}@media (max-width: 576px){.grid-4,.grid-3,.grid-2{grid-template-columns:1fr}}.text-center{text-align:center}.text-primary{color:var(--primary-color)}.text-secondary{color:var(--text-secondary)}.mt-1{margin-top:var(--spacing-sm)}.mt-2{margin-top:var(--spacing-md)}.mt-3{margin-top:var(--spacing-lg)}.mt-4{margin-top:var(--spacing-xl)}.mb-1{margin-bottom:var(--spacing-sm)}.mb-2{margin-bottom:var(--spacing-md)}.mb-3{margin-bottom:var(--spacing-lg)}.mb-4{margin-bottom:var(--spacing-xl)}.article-content{line-height:1.8}.article-content h2{font-size:24px;color:var(--primary-color);margin:24px 0 16px}.article-content h3{font-size:20px;color:var(--text-primary);margin:20px 0 12px}.article-content p{margin-bottom:16px}.article-content ul,.article-content ol{margin:16px 0;padding-left:24px}.article-content li{list-style:disc;margin-bottom:8px}.article-content ol li{list-style:decimal}.article-content code{background-color:#f5f5f5;padding:2px 6px;border-radius:3px;font-family:Courier New,monospace;font-size:13px}.article-content pre{background-color:#263238;color:#aed581;padding:16px;border-radius:6px;overflow-x:auto;margin:16px 0}.article-content pre code{background:none;padding:0;color:inherit}.article-content table{width:100%;border-collapse:collapse;margin:16px 0}.article-content th,.article-content td{border:1px solid var(--border-color);padding:10px 12px;text-align:left}.article-content th{background-color:var(--bg-light);font-weight:600}.pagination{display:flex;justify-content:center;gap:8px;margin-top:var(--spacing-xl)}.loading{display:flex;justify-content:center;align-items:center;min-height:200px}