* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            text-decoration: none;
            color: #4a6fa5;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #ff6b6b;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #1a2980, #26d0ce);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.5rem;
            font-weight: bold;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            font-size: 2rem;
        }
        .my-logo:hover {
            color: #ffd166;
        }
        .breadcrumb {
            padding: 10px 0;
            font-size: 0.9rem;
            color: #ddd;
        }
        .breadcrumb a {
            color: #ffd166;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        nav a {
            color: white;
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            transition: background 0.3s ease;
        }
        nav a:hover {
            background: rgba(255,255,255,0.2);
        }
        main {
            flex: 1;
            padding: 2rem 0;
        }
        article {
            background: white;
            padding: 2.5rem;
            border-radius: 15px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            margin-bottom: 2rem;
        }
        h1 {
            font-size: 3rem;
            color: #1a2980;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            text-align: center;
        }
        h2 {
            font-size: 2.2rem;
            color: #26d0ce;
            margin: 2rem 0 1rem;
            border-left: 5px solid #ff6b6b;
            padding-left: 15px;
        }
        h3 {
            font-size: 1.8rem;
            color: #4a6fa5;
            margin: 1.5rem 0 0.8rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #333;
            margin: 1.2rem 0 0.6rem;
        }
        p {
            margin-bottom: 1.2rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight {
            background: #fff9db;
            padding: 1.5rem;
            border-left: 4px solid #ffd166;
            margin: 1.5rem 0;
            border-radius: 0 10px 10px 0;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            margin: 1.5rem auto;
            display: block;
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: -0.5rem;
            margin-bottom: 1.5rem;
        }
        .functionality {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .card {
            background: #f1f8ff;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        .card h3 {
            color: #1a2980;
            margin-top: 0;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        input, textarea, select {
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 1rem;
            width: 100%;
        }
        button {
            background: linear-gradient(to right, #4a6fa5, #26d0ce);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 5px;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.3s ease;
        }
        button:hover {
            background: linear-gradient(to right, #3a5a8a, #1db9b7);
        }
        .rating {
            display: flex;
            gap: 5px;
            margin: 1rem 0;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 1.5rem;
            color: #ccc;
            cursor: pointer;
            transition: color 0.3s ease;
        }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label {
            color: #ffd166;
        }
        .update-time {
            text-align: right;
            font-size: 0.9rem;
            color: #888;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px solid #eee;
        }
        footer {
            background: #1a2980;
            color: white;
            padding: 2rem 0;
            text-align: center;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
            font-size: 1.1rem;
        }
        friend-link a {
            color: #ffd166;
            margin: 0 10px;
        }
        friend-link a:hover {
            text-decoration: underline;
        }
        .copyright {
            margin-top: 1.5rem;
            font-size: 0.9rem;
            color: #ccc;
        }
        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                align-items: flex-start;
                gap: 1rem;
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 20px;
            }
            nav ul {
                flex-direction: column;
                gap: 0;
                width: 100%;
                display: none;
                background: rgba(26, 41, 128, 0.95);
                padding: 1rem;
                border-radius: 10px;
                margin-top: 1rem;
            }
            nav ul.active {
                display: flex;
            }
            nav a {
                display: block;
                padding: 0.8rem;
                text-align: center;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            article {
                padding: 1.5rem;
            }
            .functionality {
                grid-template-columns: 1fr;
            }
        }