:root{--primary-color:#3498db;--primary-color-rgb:52, 152, 219;--secondary-color:#2980b9;--accent-color:#e74c3c;--background-color:#f5f7fa;--card-background:#fff;--text-color:#333;--light-text:#777;--border-color:#ddd;--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:#222;--card-background:#333;--text-color:#eee;--light-text:#aaa;--border-color:#444}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--background-color);color:var(--text-color);flex-direction:column;min-height:100vh;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;display:flex}a{color:var(--primary-color);text-decoration:none;transition:color .2s}a:hover{color:var(--accent-color)}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}header{background-color:var(--primary-color);color:#fff;z-index:100;padding:15px 0;position:sticky;top:0;box-shadow:0 2px 5px #0000001a}.header-container{justify-content:space-between;align-items:center;display:flex}.logo{letter-spacing:1px;font-size:1.8rem;font-weight:700}.logo a{color:#fff}.main-nav ul,.user-menu ul{list-style:none;display:flex}.main-nav li,.user-menu li{margin-left:20px}.main-nav a,.user-menu a{color:#fff;border-radius:4px;padding:5px 10px;font-weight:500;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{align-items:center;display:flex}.theme-btn{cursor:pointer;border:2px solid #fff;border-radius:50%;width:20px;height:20px;margin-left:8px;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{color:#fff;cursor:pointer;background:0 0;border:none;font-size:1.5rem;display:none}.breadcrumbs{background-color:var(--card-background);border-bottom:1px solid var(--border-color);margin-bottom:0;padding:10px 0;box-shadow:0 1px 3px #00000008}.breadcrumb-list{align-items:center;font-size:.9rem;list-style:none;display:flex}.breadcrumb-list li{align-items:center;display:flex}.breadcrumb-list a{color:var(--primary-color)}.breadcrumb-list a:hover{text-decoration:underline}.breadcrumb-separator{color:var(--light-text);margin:0 8px}#current-breadcrumb{color:var(--light-text);font-weight:500}.content-area{margin:30px 0;display:flex}.main-content{flex:3;margin-right:30px}.section-title{border-bottom:2px solid var(--primary-color);color:var(--primary-color);margin-bottom:20px;padding-bottom:10px;font-size:1.5rem}.article{background-color:var(--card-background);border-left:4px solid var(--primary-color);border-radius:5px;margin-bottom:20px;padding:20px;box-shadow:0 2px 5px #0000000d}.article-title{margin-bottom:10px;font-size:1.3rem}.article-meta{color:var(--light-text);align-items:center;margin-bottom:15px;font-size:.9rem;display:flex}.article-meta span{margin-right:15px}.article-meta i{margin-right:5px}.article-content{margin-bottom:15px}.read-more{color:var(--primary-color);font-weight:500;display:inline-block}.read-more:hover{color:var(--accent-color)}.sidebar{flex:1}.sidebar-widget{background-color:var(--card-background);border-radius:5px;margin-bottom:30px;padding:20px;box-shadow:0 2px 5px #0000000d}.widget-title{border-bottom:2px solid var(--primary-color);color:var(--primary-color);margin-bottom:15px;padding-bottom:8px;font-size:1.2rem}.popular-articles{list-style:none}.popular-articles li{border-bottom:1px solid var(--border-color);margin-bottom:10px;padding-bottom:10px}.popular-articles li:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}.category-list{list-style:none}.category-list li{border-radius:4px;margin-bottom:0;transition:background-color .2s}.category-list a{justify-content:space-between;width:100%;padding:4px 0 4px 10px;display:flex}.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{justify-content:center;margin-top:30px;list-style:none;display:flex}.pagination li{margin:0 5px}.pagination a{background-color:var(--card-background);border:1px solid var(--border-color);color:var(--text-color);border-radius:4px;padding:8px 12px;transition:all .2s;display:block}.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;margin-bottom:20px;padding:20px;box-shadow:0 2px 5px #0000000d}.form-footer{text-align:center}.form-title{color:var(--primary-color);text-align:center;margin-bottom:20px;font-size:1.5rem}.form-group{margin-bottom:20px}.form-label{margin-bottom:8px;font-weight:500;display:block}.form-input{border:1px solid var(--border-color);background-color:var(--background-color);width:100%;color:var(--text-color);border-radius:4px;padding:10px 15px;font-size:1rem}.form-input:focus{border-color:var(--primary-color);outline:none;box-shadow:0 0 0 2px #3498db33}.form-button{background-color:var(--primary-color);color:#fff;cursor:pointer;border:none;border-radius:4px;width:100%;padding:12px;font-size:1rem;font-weight:500;transition:background-color .2s;display:block}.form-button:hover{background-color:var(--secondary-color)}.form-footer{text-align:center;margin-top:20px}footer{background-color:var(--primary-color);color:#fff;margin-top:50px;padding:40px 0 20px}.footer-container{flex-wrap:wrap;justify-content:space-between;display:flex}.footer-section{flex:1;min-width:200px;margin-bottom:30px;padding-right:20px}.footer-title{margin-bottom:15px;font-size:1.2rem}.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;color:#ffffffb3;border-top:1px solid #ffffff1a;margin-top:20px;padding-top:20px;font-size:.9rem}.success-message{background-color:var(--success-color);color:#fff;border-radius:4px;margin-bottom:15px;padding:10px 15px;display:none}.success-message.show{display:block}.message{border-radius:4px;align-items:center;margin-bottom:20px;padding:12px 15px;display:flex;position:relative}.message-icon{margin-right:12px;font-size:1.2rem}.message-content{flex:1}.message-title{margin-bottom:3px;font-weight:600}.message-text{font-size:.95rem}.message-close{color:inherit;opacity:.7;cursor:pointer;background:0 0;border:none;margin-left:10px;padding:0;font-size:1.2rem}.message-close:hover{opacity:1}.message-success{color:#155724;background-color:#d4edda;border-left:4px solid #28a745}.message-error{color:#721c24;background-color:#f8d7da;border-left:4px solid #dc3545}.message-warning{color:#856404;background-color:#fff3cd;border-left:4px solid #ffc107}.message-info{color:#0c5460;background-color:#d1ecf1;border-left:4px solid #17a2b8}.message-neutral{color:#383d41;background-color:#e9ecef;border-left:4px solid #6c757d}.page-content{display:none}.page-content.active{display:block}.back-button{color:var(--primary-color);margin:15px 0;font-weight:500;display:inline-block}@media (width<=768px){.header-container{flex-direction:column;align-items:flex-start}.main-nav,.user-menu{width:100%;margin-top:15px;display:none}.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-bottom:30px;margin-right:0}.footer-container{flex-direction:column}.footer-section{margin-bottom:30px}.theme-toggle{margin-top:15px}}