:root {
            --primary-blue: #2a5c8d;
            --secondary-blue: #4a90e2;
            --accent-yellow: #f5b642;
            --accent-red: #d9534f;
            --light-bg: #f8f9fa;
            --dark-text: #333;
            --gray-border: #dee2e6;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            color: var(--dark-text);
            background-color: #fff;
            line-height: 1.7;
            font-size: 1.05rem;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: color 0.3s;
        }
        a:hover {
            color: var(--accent-red);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary-blue) 0%, #1a3a5a 100%);
            color: white;
            padding: 1.2rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--accent-yellow);
        }
        .my-logo:hover {
            color: var(--accent-yellow);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-desktop a:hover {
            color: var(--accent-yellow);
        }
        .nav-desktop a:after {
            content: '';
            position: absolute;
            width: 0;
            height: 3px;
            bottom: 0;
            left: 0;
            background-color: var(--accent-yellow);
            transition: width 0.3s;
        }
        .nav-desktop a:hover:after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .mobile-nav {
            position: fixed;
            top: 0;
            right: -300px;
            width: 280px;
            height: 100vh;
            background-color: var(--primary-blue);
            padding: 2rem;
            transition: right 0.4s ease;
            z-index: 1001;
            box-shadow: -5px 0 15px rgba(0,0,0,0.2);
            overflow-y: auto;
        }
        .mobile-nav.active {
            right: 0;
        }
        .mobile-nav a {
            display: block;
            color: white;
            padding: 1rem 0;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            font-weight: 600;
        }
        .mobile-nav a:hover {
            color: var(--accent-yellow);
        }
        .close-menu {
            position: absolute;
            top: 1rem;
            right: 1.5rem;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 1000;
        }
        .overlay.active {
            display: block;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: var(--light-bg);
            margin-bottom: 2rem;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: #666;
        }
        .breadcrumb a:hover {
            color: var(--primary-blue);
        }
        .breadcrumb span {
            color: #999;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: var(--light-bg);
            padding: 2rem;
            border-radius: 10px;
            height: fit-content;
            position: sticky;
            top: 120px;
        }
        @media (max-width: 992px) {
            .sidebar {
                position: static;
            }
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget h3 {
            color: var(--primary-blue);
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent-yellow);
        }
        .search-box {
            display: flex;
            margin-bottom: 2rem;
        }
        .search-box input {
            flex-grow: 1;
            padding: 0.9rem 1rem;
            border: 2px solid var(--gray-border);
            border-radius: 6px 0 0 6px;
            font-size: 1rem;
            outline: none;
        }
        .search-box input:focus {
            border-color: var(--secondary-blue);
        }
        .search-box button {
            background-color: var(--primary-blue);
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 6px 6px 0;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-box button:hover {
            background-color: var(--secondary-blue);
        }
        h1 {
            color: var(--primary-blue);
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
        }
        h2 {
            color: #2a5c8d;
            font-size: 2rem;
            margin: 2.8rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent-yellow);
        }
        h3 {
            color: #3a6ca8;
            font-size: 1.6rem;
            margin: 2.2rem 0 1rem;
        }
        h4 {
            color: #4a7cb8;
            font-size: 1.3rem;
            margin: 1.8rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.2rem;
            font-weight: 600;
            color: #444;
            background: #f0f8ff;
            padding: 1.5rem;
            border-left: 5px solid var(--secondary-blue);
            border-radius: 5px;
            margin-bottom: 2.5rem;
        }
        .highlight {
            background-color: #fff9e6;
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 5px solid var(--accent-yellow);
            margin: 2rem 0;
        }
        .tip {
            background-color: #e8f4fd;
            padding: 1.2rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            display: flex;
            align-items: flex-start;
            gap: 15px;
        }
        .tip i {
            color: var(--secondary-blue);
            font-size: 1.5rem;
            margin-top: 3px;
        }
        .quote {
            font-style: italic;
            color: #555;
            border-left: 4px solid #ccc;
            padding-left: 1.5rem;
            margin: 2rem 0 2rem 2rem;
        }
        .author {
            font-weight: bold;
            color: #333;
            margin-top: 0.5rem;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 2rem auto;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        ul, ol {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.7rem;
        }
        strong {
            color: var(--primary-blue);
        }
        .interactive-section {
            background: var(--light-bg);
            padding: 2.5rem;
            border-radius: 10px;
            margin-top: 3rem;
        }
        .interactive-section h2 {
            margin-top: 0;
        }
        .rating-form, .comment-form {
            margin-bottom: 2.5rem;
        }
        .star-rating {
            display: flex;
            gap: 10px;
            margin: 1rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover ~ label,
        .star-rating input:checked ~ label {
            color: var(--accent-yellow);
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.9rem;
            border: 2px solid var(--gray-border);
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: var(--secondary-blue);
            outline: none;
        }
        button[type="submit"] {
            background-color: var(--primary-blue);
            color: white;
            border: none;
            padding: 1rem 2.5rem;
            border-radius: 6px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        button[type="submit"]:hover {
            background-color: var(--secondary-blue);
        }
        .site-footer {
            background-color: #1a2b3c;
            color: #ccc;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links a {
            display: block;
            color: #aaa;
            margin-bottom: 0.8rem;
        }
        .footer-links a:hover {
            color: var(--accent-yellow);
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 1rem;
            margin-bottom: 1rem;
            border-radius: 6px;
            transition: background 0.3s;
        }
        friend-link:hover {
            background: rgba(255,255,255,0.1);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2a3a4a;
            color: #888;
            font-size: 0.9rem;
        }
        .update-time {
            font-size: 0.9rem;
            color: #666;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px dashed var(--gray-border);
            text-align: right;
        }
        .text-center { text-align: center; }
        .mt-3 { margin-top: 3rem; }
        .mb-3 { margin-bottom: 3rem; }
        .flex {
            display: flex;
            align-items: center;
            gap: 15px;
        }