:root{--primary-color: #3498db;--primary-color-rgb: 52, 152, 219;--secondary-color: #2980b9;--accent-color: #e74c3c;--background-color: #f5f7fa;--card-background: #ffffff;--text-color: #333333;--light-text: #777777;--border-color: #dddddd;--success-color: #2ecc71}.theme-green{--primary-color: #27ae60;--primary-color-rgb: 39, 174, 96;--secondary-color: #219651;--accent-color: #e67e22;--background-color: #f5faf7}.theme-purple{--primary-color: #9b59b6;--primary-color-rgb: 155, 89, 182;--secondary-color: #8e44ad;--accent-color: #f1c40f;--background-color: #f7f5fa}.theme-dark{--primary-color: #34495e;--primary-color-rgb: 52, 73, 94;--secondary-color: #2c3e50;--accent-color: #e74c3c;--background-color: #222222;--card-background: #333333;--text-color: #eeeeee;--light-text: #aaaaaa;--border-color: #444444}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:var(--background-color);color:var(--text-color);line-height:1.6;display:flex;flex-direction:column;min-height:100vh}a{color:var(--primary-color);text-decoration:none;transition:color .2s}a:hover{color:var(--accent-color)}.container{max-width:1200px;margin:0 auto;padding:0 20px;width:100%}header{background-color:var(--primary-color);color:#fff;padding:15px 0;box-shadow:0 2px 5px #0000001a;position:sticky;top:0;z-index:100}.header-container{display:flex;justify-content:space-between;align-items:center}.logo{font-size:1.8rem;font-weight:700;letter-spacing:1px}.logo a{color:#fff}.main-nav ul,.user-menu ul{display:flex;list-style:none}.main-nav li,.user-menu li{margin-left:20px}.main-nav a,.user-menu a{color:#fff;font-weight:500;padding:5px 10px;border-radius:4px;transition:background-color .2s}.main-nav a:hover,.main-nav a.active,.user-menu a:hover,.user-menu a.active{background-color:var(--secondary-color)}.theme-toggle{display:flex;align-items:center}.theme-btn{width:20px;height:20px;border-radius:50%;border:2px solid white;margin-left:8px;cursor:pointer;transition:transform .2s}.theme-btn:hover{transform:scale(1.2)}.blue{background-color:#3498db}.green{background-color:#27ae60}.purple{background-color:#9b59b6}.dark{background-color:#2c3e50}.mobile-menu-btn{display:none;font-size:1.5rem;background:none;border:none;color:#fff;cursor:pointer}.breadcrumbs{background-color:var(--card-background);border-bottom:1px solid var(--border-color);padding:10px 0;margin-bottom:0;box-shadow:0 1px 3px #00000008}.breadcrumb-list{list-style:none;display:flex;align-items:center;font-size:.9rem}.breadcrumb-list li{display:flex;align-items:center}.breadcrumb-list a{color:var(--primary-color)}.breadcrumb-list a:hover{text-decoration:underline}.breadcrumb-separator{margin:0 8px;color:var(--light-text)}#current-breadcrumb{color:var(--light-text);font-weight:500}.content-area{display:flex;margin:30px 0}.main-content{flex:3;margin-right:30px}.section-title{font-size:1.5rem;margin-bottom:20px;padding-bottom:10px;border-bottom:2px solid var(--primary-color);color:var(--primary-color)}.article{background-color:var(--card-background);border-radius:5px;box-shadow:0 2px 5px #0000000d;padding:20px;margin-bottom:20px;border-left:4px solid var(--primary-color)}.article-title{font-size:1.3rem;margin-bottom:10px}.article-meta{font-size:.9rem;color:var(--light-text);margin-bottom:15px;display:flex;align-items:center}.article-meta span{margin-right:15px}.article-meta i{margin-right:5px}.article-content{margin-bottom:15px}.read-more{display:inline-block;color:var(--primary-color);font-weight:500}.read-more:hover{color:var(--accent-color)}.sidebar{flex:1}.sidebar-widget{background-color:var(--card-background);border-radius:5px;box-shadow:0 2px 5px #0000000d;padding:20px;margin-bottom:30px}.widget-title{font-size:1.2rem;margin-bottom:15px;padding-bottom:8px;border-bottom:2px solid var(--primary-color);color:var(--primary-color)}.popular-articles{list-style:none}.popular-articles li{margin-bottom:10px;padding-bottom:10px;border-bottom:1px solid var(--border-color)}.popular-articles li:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.category-list{list-style:none}.category-list li{margin-bottom:0;border-radius:4px;transition:background-color .2s}.category-list a{display:flex;justify-content:space-between;padding:4px 0 4px 10px;width:100%}.category-list li:hover{background-color:rgba(var(--primary-color-rgb),.1)}.category-list li.active{background-color:rgba(var(--primary-color-rgb),.2)}.category-count{background-color:var(--primary-color);color:#fff;border-radius:20px;padding:0 8px;font-size:.8rem}.pagination{display:flex;justify-content:center;margin-top:30px;list-style:none}.pagination li{margin:0 5px}.pagination a{display:block;padding:8px 12px;background-color:var(--card-background);border:1px solid var(--border-color);border-radius:4px;color:var(--text-color);transition:all .2s}.pagination a:hover{background-color:var(--primary-color);color:#fff}.pagination a.active{background-color:var(--primary-color);color:#fff;border-color:var(--primary-color)}.form-container{background-color:var(--card-background);border-radius:5px;box-shadow:0 2px 5px #0000000d;padding:20px;margin-bottom:20px}.form-footer{text-align:center}.form-title{font-size:1.5rem;margin-bottom:20px;color:var(--primary-color);text-align:center}.form-group{margin-bottom:20px}.form-label{display:block;margin-bottom:8px;font-weight:500}.form-input{width:100%;padding:10px 15px;border:1px solid var(--border-color);border-radius:4px;background-color:var(--background-color);color:var(--text-color);font-size:1rem}.form-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #3498db33}.form-button{display:block;width:100%;padding:12px;background-color:var(--primary-color);color:#fff;border:none;border-radius:4px;font-size:1rem;font-weight:500;cursor:pointer;transition:background-color .2s}.form-button:hover{background-color:var(--secondary-color)}.form-footer{text-align:center;margin-top:20px}footer{background-color:var(--primary-color);color:#fff;padding:40px 0 20px;margin-top:50px}.footer-container{display:flex;flex-wrap:wrap;justify-content:space-between}.footer-section{flex:1;min-width:200px;margin-bottom:30px;padding-right:20px}.footer-title{font-size:1.2rem;margin-bottom:15px}.footer-links{list-style:none}.footer-links li{margin-bottom:10px}.footer-links a{color:#fffc}.footer-links a:hover{color:#fff}.footer-bottom{text-align:center;padding-top:20px;margin-top:20px;border-top:1px solid rgba(255,255,255,.1);font-size:.9rem;color:#ffffffb3}.success-message{background-color:var(--success-color);color:#fff;padding:10px 15px;border-radius:4px;margin-bottom:15px;display:none}.success-message.show{display:block}.message{padding:12px 15px;border-radius:4px;margin-bottom:20px;display:flex;align-items:center;position:relative}.message-icon{margin-right:12px;font-size:1.2rem}.message-content{flex:1}.message-title{font-weight:600;margin-bottom:3px}.message-text{font-size:.95rem}.message-close{background:none;border:none;color:inherit;opacity:.7;cursor:pointer;font-size:1.2rem;padding:0;margin-left:10px}.message-close:hover{opacity:1}.message-success{background-color:#d4edda;color:#155724;border-left:4px solid #28a745}.message-error{background-color:#f8d7da;color:#721c24;border-left:4px solid #dc3545}.message-warning{background-color:#fff3cd;color:#856404;border-left:4px solid #ffc107}.message-info{background-color:#d1ecf1;color:#0c5460;border-left:4px solid #17a2b8}.message-neutral{background-color:#e9ecef;color:#383d41;border-left:4px solid #6c757d}.page-content{display:none}.page-content.active{display:block}.back-button{display:inline-block;margin:15px 0;color:var(--primary-color);font-weight:500}@media(max-width:768px){.header-container{flex-direction:column;align-items:flex-start}.main-nav,.user-menu{display:none;width:100%;margin-top:15px}.main-nav.show,.user-menu.show{display:block}.main-nav ul,.user-menu ul{flex-direction:column}.main-nav li,.user-menu li{margin:0 0 10px}.mobile-menu-btn{display:block;position:absolute;top:15px;right:15px}.content-area{flex-direction:column}.main-content{margin-right:0;margin-bottom:30px}.footer-container{flex-direction:column}.footer-section{margin-bottom:30px}.theme-toggle{margin-top:15px}}