* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: #2c5aa0;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #e74c3c;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #1a237e, #283593);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: #ffd700;
            letter-spacing: 1px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .my-logo span {
            color: #4fc3f7;
        }
        .search-form {
            display: flex;
            flex-grow: 0.4;
            max-width: 400px;
        }
        .search-form input {
            flex-grow: 1;
            padding: 12px 20px;
            border: none;
            border-radius: 30px 0 0 30px;
            font-size: 1rem;
            outline: none;
        }
        .search-form button {
            background-color: #ff9800;
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 30px 30px 0;
            cursor: pointer;
            font-weight: bold;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background-color: #f57c00;
        }
        .main-nav {
            background-color: #3949ab;
            margin-top: 1rem;
            border-radius: 8px;
        }
        .nav-list {
            display: flex;
            list-style: none;
            justify-content: space-around;
            padding: 0.8rem;
        }
        .nav-list a {
            color: #fff;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            display: block;
        }
        .nav-list a:hover {
            background-color: #5c6bc0;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: #777;
        }
        .breadcrumb a {
            color: #2c5aa0;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 30px;
            margin: 30px 0;
        }
        .content-area {
            background: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .sidebar {
            background: white;
            padding: 25px;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        h1 {
            color: #1a237e;
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            border-bottom: 3px solid #ffd700;
            padding-bottom: 10px;
        }
        h2 {
            color: #283593;
            font-size: 2rem;
            margin: 2rem 0 1rem;
            padding-top: 10px;
        }
        h3 {
            color: #3949ab;
            font-size: 1.6rem;
            margin: 1.5rem 0 0.8rem;
        }
        h4 {
            color: #5c6bc0;
            font-size: 1.3rem;
            margin: 1.2rem 0 0.6rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
            font-size: 1.05rem;
        }
        .highlight {
            background-color: #fff9c4;
            padding: 20px;
            border-left: 5px solid #ffc107;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-img {
            width: 100%;
            max-height: 450px;
            object-fit: cover;
            border-radius: 10px;
            margin: 25px 0;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            border: 3px solid #e3f2fd;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .link-list {
            list-style: none;
            padding: 20px;
            background: #e8eaf6;
            border-radius: 10px;
            margin: 25px 0;
        }
        .link-list li {
            padding: 10px 0;
            border-bottom: 1px dashed #9fa8da;
        }
        .link-list li:last-child {
            border-bottom: none;
        }
        .user-module {
            background: #f1f8e9;
            padding: 25px;
            border-radius: 10px;
            margin: 30px 0;
            border: 1px solid #c5e1a5;
        }
        .module-title {
            color: #33691e;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .rating {
            display: flex;
            align-items: center;
            gap: 10px;
            margin: 15px 0;
        }
        .star {
            color: #ffb300;
            font-size: 1.5rem;
            cursor: pointer;
            transition: transform 0.2s;
        }
        .star:hover {
            transform: scale(1.2);
        }
        textarea, input[type="text"], input[type="email"] {
            width: 100%;
            padding: 15px;
            margin-bottom: 15px;
            border: 1px solid #ccc;
            border-radius: 8px;
            font-size: 1rem;
            resize: vertical;
        }
        .submit-btn {
            background: linear-gradient(to right, #00c853, #64dd17);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 30px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
        }
        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(0,200,83,0.3);
        }
        .sidebar h3 {
            color: #d81b60;
            border-bottom: 2px solid #f48fb1;
            padding-bottom: 8px;
        }
        .sidebar ul {
            list-style: none;
            margin-top: 15px;
        }
        .sidebar li {
            padding: 12px 0;
            border-bottom: 1px solid #eee;
        }
        .update-time {
            background: #e3f2fd;
            padding: 15px;
            border-radius: 8px;
            text-align: center;
            margin-top: 25px;
            font-weight: bold;
            color: #1565c0;
        }
        footer {
            background: #1a237e;
            color: white;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-section h4 {
            color: #ffd700;
            margin-bottom: 20px;
        }
        friend-link {
            display: block;
            padding: 8px 0;
            color: #bbdefb;
            border-bottom: 1px dotted #3949ab;
        }
        friend-link:hover {
            color: #ffffff;
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #c5cae9;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            .header-top {
                flex-wrap: wrap;
            }
            .search-form {
                order: 3;
                width: 100%;
                max-width: 100%;
                margin-top: 15px;
            }
        }
        @media (max-width: 768px) {
            .nav-list {
                display: none;
                flex-direction: column;
                width: 100%;
                text-align: center;
            }
            .nav-list.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
        }