:root {
            --primary: #F44336;
            --primary-dark: #D32F2F;
            --secondary: #2196F3;
            --dark: #212121;
            --light: #f5f5f5;
            --gray: #757575;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background-color: #fafafa;
            color: var(--dark);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            color: var(--secondary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--dark) 0%, #424242 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--primary);
        }
        .logo a:hover {
            color: #FFC107;
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 1.8rem;
        }
        nav a {
            color: #eee;
            font-weight: 600;
            font-size: 1rem;
            padding: 0.5rem 0;
            position: relative;
        }
        nav a:hover, nav a.active {
            color: #FFC107;
        }
        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--primary);
            transition: var(--transition);
        }
        nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #eee;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--gray);
            margin: 0 8px;
        }
        main {
            padding: 2rem 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        .content-area {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        h1 {
            color: var(--primary-dark);
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            border-left: 6px solid var(--primary);
            padding-left: 1rem;
        }
        h2 {
            color: var(--dark);
            font-size: 2rem;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eee;
        }
        h3 {
            color: var(--secondary);
            font-size: 1.5rem;
            margin: 2rem 0 1rem;
        }
        h4 {
            color: var(--gray);
            font-size: 1.2rem;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.2rem;
            font-size: 1.05rem;
        }
        .intro {
            font-size: 1.2rem;
            color: var(--dark);
            background: linear-gradient(to right, #f8f9fa, #fff);
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 2rem;
            border-left: 4px solid var(--secondary);
        }
        .highlight {
            background-color: #fff8e1;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            border-left: 4px solid #FFC107;
        }
        .tip {
            background-color: #e3f2fd;
            padding: 1rem;
            border-radius: 8px;
            margin: 1.2rem 0;
            display: flex;
            gap: 12px;
            align-items: flex-start;
        }
        .tip i {
            color: var(--secondary);
            font-size: 1.2rem;
            margin-top: 3px;
        }
        ul, ol {
            padding-left: 2rem;
            margin-bottom: 1.2rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .feature-img {
            width: 100%;
            border-radius: 10px;
            margin: 2rem 0;
            border: 1px solid #ddd;
            box-shadow: 0 6px 16px rgba(0,0,0,0.1);
        }
        .button {
            display: inline-block;
            background: linear-gradient(to right, var(--primary), var(--primary-dark));
            color: white;
            padding: 0.9rem 1.8rem;
            border-radius: 50px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            margin: 0.5rem;
        }
        .button:hover {
            background: linear-gradient(to right, var(--primary-dark), #B71C1C);
            transform: translateY(-3px);
            box-shadow: 0 8px 18px rgba(244, 67, 54, 0.3);
            color: white;
        }
        .button.secondary {
            background: linear-gradient(to right, var(--secondary), #1976D2);
        }
        .button.secondary:hover {
            background: linear-gradient(to right, #1976D2, #0D47A1);
            box-shadow: 0 8px 18px rgba(33, 150, 243, 0.3);
        }
        .cta-box {
            text-align: center;
            padding: 2.5rem;
            background: linear-gradient(135deg, #1a237e 0%, #311b92 100%);
            color: white;
            border-radius: 12px;
            margin: 3rem 0;
        }
        .cta-box h2 {
            color: white;
            border: none;
        }
        .search-box, .comment-box, .rating-box {
            background: #f9f9f9;
            padding: 1.8rem;
            border-radius: 10px;
            margin-bottom: 2rem;
            border: 1px solid #e0e0e0;
        }
        .search-box h3, .comment-box h3, .rating-box h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--dark);
        }
        .form-control {
            width: 100%;
            padding: 0.9rem 1rem;
            border: 1px solid #ccc;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--secondary);
            box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.2);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .stars {
            display: flex;
            gap: 10px;
            margin: 1rem 0;
            justify-content: center;
        }
        .star {
            font-size: 2.2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover, .star.active {
            color: #FFC107;
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget h4 {
            background: var(--dark);
            color: white;
            padding: 0.8rem 1rem;
            border-radius: 6px;
            margin: -1.5rem -1.5rem 1.5rem;
            font-size: 1.1rem;
        }
        .link-list {
            list-style: none;
            padding-left: 0;
        }
        .link-list li {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px dashed #eee;
        }
        .link-list li:last-child {
            border-bottom: none;
        }
        .link-list a {
            display: block;
            padding: 0.5rem 0;
            color: var(--dark);
        }
        .link-list a:hover {
            color: var(--primary);
            padding-left: 8px;
        }
        .link-list a i {
            margin-right: 10px;
            color: var(--gray);
        }
        footer {
            background: var(--dark);
            color: #ccc;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            margin-bottom: 1rem;
        }
        .footer-about p {
            margin-bottom: 1rem;
            font-size: 0.95rem;
        }
        friend-link {
            display: block;
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
        }
        friend-link h4 {
            color: #fff;
            margin-bottom: 1rem;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        .friend-links a {
            background: #333;
            color: #ccc;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            font-size: 0.9rem;
        }
        .friend-links a:hover {
            background: var(--primary);
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            font-size: 0.9rem;
            color: #999;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
            h1 {
                font-size: 2.4rem;
            }
            h2 {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background: var(--dark);
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1rem 0;
                box-shadow: var(--shadow);
                z-index: 999;
            }
            nav ul.active {
                display: flex;
            }
            nav ul li {
                text-align: center;
                padding: 0.7rem 0;
            }
            .hamburger {
                display: block;
            }
            .content-area, .sidebar {
                padding: 1.5rem;
            }
            .footer-container {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .friend-links {
                justify-content: center;
            }
        }