:root {
            --primary: #2c3e50;
            --accent: #3498db;
            --accent2: #1abc9c;
            --bg: #f8f9fa;
            --card-bg: #ffffff;
            --text: #2d2d2d;
            --muted: #6c757d;
            --border: #e9ecef;
            --radius: 12px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--primary) 0%, #1a252f 100%);
            padding: 20px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            text-decoration: none;
            letter-spacing: 1px;
            background: linear-gradient(45deg, #3498db, #1abc9c);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: transform 0.3s;
        }
        .my-logo:hover {
            transform: scale(1.05);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 5px 10px;
        }
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 6px;
            flex-wrap: wrap;
        }
        .nav-menu li a {
            color: rgba(255, 255, 255, 0.85);
            text-decoration: none;
            padding: 8px 14px;
            border-radius: 30px;
            font-weight: 500;
            font-size: 0.9rem;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .nav-menu li a:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            transform: translateY(-2px);
        }
        .breadcrumb {
            padding: 15px 0;
            font-size: 0.85rem;
            color: var(--muted);
            background: transparent;
        }
        .breadcrumb a {
            color: var(--accent);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .sep {
            margin: 0 6px;
            color: #aaa;
        }
        main {
            padding: 20px 0 60px;
        }
        .hero {
            background: linear-gradient(135deg, rgba(52, 152, 219, 0.08), rgba(26, 188, 156, 0.08));
            border-radius: var(--radius);
            padding: 40px 30px;
            margin: 20px 0 40px;
            border-left: 5px solid var(--accent);
            text-align: center;
        }
        .hero h1 {
            font-size: 2.4rem;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--primary);
        }
        .hero p {
            max-width: 750px;
            margin: 0 auto;
            color: var(--muted);
            font-size: 1.1rem;
        }
        .article-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 35px;
            margin-bottom: 35px;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.04);
            border: 1px solid var(--border);
        }
        h2 {
            font-size: 1.7rem;
            color: var(--primary);
            margin: 35px 0 15px;
            padding-bottom: 10px;
            border-bottom: 3px solid var(--accent2);
            display: inline-block;
        }
        h3 {
            font-size: 1.3rem;
            color: var(--primary);
            margin: 25px 0 12px;
        }
        h4 {
            font-size: 1.05rem;
            color: var(--accent);
            margin: 20px 0 10px;
            font-weight: 600;
        }
        p {
            margin-bottom: 14px;
        }
        .tip-box {
            background: #e8f8f5;
            border-left: 4px solid var(--accent2);
            padding: 18px 22px;
            border-radius: 8px;
            margin: 20px 0;
        }
        .warn-box {
            background: #fef9e7;
            border-left: 4px solid #f1c40f;
            padding: 18px 22px;
            border-radius: 8px;
            margin: 20px 0;
        }
        .info-box {
            background: #ebf5fb;
            border-left: 4px solid var(--accent);
            padding: 18px 22px;
            border-radius: 8px;
            margin: 20px 0;
        }
        .feature-img {
            width: 100%;
            border-radius: var(--radius);
            margin: 20px 0;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s;
        }
        .feature-img:hover {
            transform: scale(1.01);
        }
        .img-caption {
            text-align: center;
            color: var(--muted);
            font-size: 0.85rem;
            margin-top: -10px;
            margin-bottom: 20px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 25px;
            margin: 25px 0;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin: 25px 0;
        }
        .list-check {
            list-style: none;
            padding: 0;
        }
        .list-check li {
            padding: 6px 0 6px 28px;
            position: relative;
        }
        .list-check li::before {
            content: "✅";
            position: absolute;
            left: 0;
            font-size: 0.9rem;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 20px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.9rem;
        }
        table th {
            background: var(--primary);
            color: #fff;
            padding: 12px;
            text-align: left;
        }
        table td {
            padding: 10px 12px;
            border-bottom: 1px solid var(--border);
        }
        table tr:hover {
            background: #f8f9fa;
        }
        .search-section {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            padding: 30px;
            border-radius: var(--radius);
            margin: 40px 0;
            color: #fff;
        }
        .search-section h2 {
            color: #fff;
            border-bottom-color: rgba(255, 255, 255, 0.3);
        }
        .search-form {
            display: flex;
            gap: 10px;
            margin-top: 15px;
        }
        .search-form input {
            flex: 1;
            padding: 14px 20px;
            border: none;
            border-radius: 40px;
            font-size: 1rem;
            outline: none;
        }
        .search-form button {
            background: var(--accent2);
            border: none;
            color: #fff;
            padding: 14px 25px;
            border-radius: 40px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: #16a085;
        }
        .comment-form, .rating-form {
            background: #f8f9fa;
            padding: 25px;
            border-radius: var(--radius);
            margin: 20px 0;
            border: 1px solid var(--border);
        }
        .comment-form textarea {
            width: 100%;
            padding: 14px;
            border: 2px solid var(--border);
            border-radius: 10px;
            font-size: 1rem;
            min-height: 120px;
            resize: vertical;
            margin-bottom: 12px;
            font-family: inherit;
        }
        .comment-form input, .rating-form input {
            padding: 12px 18px;
            border: 2px solid var(--border);
            border-radius: 10px;
            font-size: 1rem;
            width: 100%;
            margin-bottom: 12px;
        }
        .btn {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            padding: 12px 24px;
            border: none;
            border-radius: 30px;
            font-size: 0.95rem;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
        }
        .btn:hover {
            background: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .rating-stars {
            display: flex;
            gap: 5px;
            margin: 10px 0 15px;
            font-size: 1.6rem;
            color: #f1c40f;
            cursor: pointer;
        }
        .faq-item {
            margin-bottom: 20px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: 10px;
            border-left: 3px solid var(--accent);
        }
        .faq-item h4 {
            margin-top: 0;
            color: var(--primary);
        }
        .newsletter {
            background: var(--primary);
            padding: 30px;
            border-radius: var(--radius);
            color: #fff;
            margin: 30px 0;
            text-align: center;
        }
        .newsletter input {
            padding: 12px 20px;
            border: none;
            border-radius: 30px;
            width: 60%;
            max-width: 300px;
        }
        .newsletter button {
            background: var(--accent2);
            border: none;
            color: #fff;
            padding: 12px 24px;
            border-radius: 30px;
            margin-left: 8px;
            cursor: pointer;
        }
        footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.8);
            padding: 50px 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-grid h3 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 15px;
        }
        .footer-grid ul {
            list-style: none;
        }
        .footer-grid ul li {
            margin-bottom: 8px;
        }
        .footer-grid ul li a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            font-size: 0.9rem;
        }
        .footer-grid ul li a:hover {
            color: var(--accent2);
        }
        .friend-link {
            display: block;
            padding: 15px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 20px;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.85rem;
        }
        .friend-link a {
            color: var(--accent2);
            text-decoration: none;
            margin: 0 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                padding: 15px 0;
            }
            .nav-menu.show {
                display: flex;
            }
            .nav-menu li {
                width: 100%;
            }
            .nav-menu li a {
                display: block;
                padding: 12px;
                border-radius: 8px;
            }
            .container {
                padding: 0 14px;
            }
            .hero {
                padding: 25px 20px;
            }
            .hero h1 {
                font-size: 1.6rem;
            }
            .article-card {
                padding: 20px;
            }
            .grid-2, .grid-3 {
                grid-template-columns: 1fr;
            }
            .search-form {
                flex-direction: column;
            }
            h2 {
                font-size: 1.4rem;
            }
            .newsletter input {
                width: 90%;
                margin-bottom: 10px;
            }
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--accent);
            color: #fff;
            width: 45px;
            height: 45px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
            z-index: 999;
            transition: all 0.3s;
        }
        .back-to-top:hover {
            background: var(--primary);
            transform: translateY(-3px);
        }