* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
            padding: 0;
            margin: 0;
        }
        a {
            text-decoration: none;
            color: #0056b3;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #ff6f00;
            text-decoration: underline;
        }
        ul {
            list-style: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        header {
            background: linear-gradient(135deg, #003366, #0066cc);
            color: white;
            padding: 1rem 2rem;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
        }
        .logo a {
            font-size: 2rem;
            font-weight: bold;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo a:hover {
            color: #ffcc00;
            text-decoration: none;
        }
        .logo i {
            font-size: 2.5rem;
        }
        .nav-container {
            display: flex;
            align-items: center;
        }
        .main-nav {
            display: flex;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: 5px;
        }
        .main-nav a:hover {
            background-color: rgba(255, 255, 255, 0.2);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #e9ecef;
            padding: 0.8rem 2rem;
            font-size: 0.9rem;
            max-width: 1200px;
            margin: 0 auto;
        }
        .breadcrumb a {
            color: #555;
        }
        .breadcrumb a:hover {
            color: #003366;
        }
        main {
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        article {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
        }
        h1 {
            font-size: 2.8rem;
            color: #003366;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            color: #0066cc;
            margin: 2rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #ffcc00;
        }
        h3 {
            font-size: 1.5rem;
            color: #333;
            margin: 1.5rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            line-height: 1.8;
        }
        .highlight {
            background-color: #fffacd;
            padding: 1.5rem;
            border-left: 5px solid #ffcc00;
            margin: 2rem 0;
            border-radius: 8px;
        }
        .emoji {
            font-size: 1.2rem;
            margin-right: 5px;
        }
        .content-image {
            margin: 2rem auto;
            border-radius: 10px;
            overflow: hidden;
            max-width: 800px;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        }
        .content-image img {
            width: 100%;
            height: auto;
        }
        .table-container {
            overflow-x: auto;
            margin: 2rem 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
        }
        th, td {
            padding: 1rem;
            text-align: left;
            border: 1px solid #ddd;
        }
        th {
            background-color: #003366;
            color: white;
            font-weight: bold;
        }
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        tr:hover {
            background-color: #e6f2ff;
        }
        .link-list {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin: 2rem 0;
            padding: 1.5rem;
            background: #f0f8ff;
            border-radius: 10px;
        }
        .link-list a {
            background: white;
            padding: 0.8rem 1.5rem;
            border-radius: 50px;
            box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
            display: inline-block;
        }
        .link-list a:hover {
            background: #0066cc;
            color: white;
            transform: translateY(-3px);
            transition: all 0.3s ease;
        }
        .function-section {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            margin-top: 2rem;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
        }
        .function-section h2 {
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
            margin-top: 1.5rem;
        }
        input, textarea, select {
            padding: 1rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            border-color: #0066cc;
            outline: none;
        }
        button {
            background: linear-gradient(to right, #0066cc, #003366);
            color: white;
            padding: 1rem 2rem;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            align-self: flex-start;
        }
        button:hover {
            background: linear-gradient(to right, #ff6f00, #cc5500);
            transform: scale(1.05);
        }
        .rating {
            display: flex;
            gap: 10px;
            align-items: center;
            margin: 1rem 0;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 2rem;
            color: #ccc;
            cursor: pointer;
        }
        .rating input:checked ~ label {
            color: #ffcc00;
        }
        .rating label:hover,
        .rating label:hover ~ label {
            color: #ffcc00;
        }
        footer {
            background: #003366;
            color: white;
            padding: 3rem 2rem 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h3 {
            color: #ffcc00;
            margin-bottom: 1.5rem;
            font-size: 1.5rem;
        }
        .friend-links {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .friend-links a {
            color: #b3d9ff;
            padding: 0.5rem 0;
            border-bottom: 1px dashed #555;
        }
        .friend-links a:hover {
            color: #ffcc00;
            border-bottom-color: #ffcc00;
        }
        .copyright {
            text-align: center;
            margin-top: 3rem;
            padding-top: 1.5rem;
            border-top: 1px solid #555;
            font-size: 0.9rem;
            color: #b3d9ff;
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background-color: #002244;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1rem;
                z-index: 1000;
                box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
            }
            .main-nav.active {
                display: flex;
            }
            .main-nav a {
                padding: 1rem;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            main {
                padding: 0 1rem;
            }
            article, .function-section {
                padding: 1.5rem;
            }
            .footer-container {
                grid-template-columns: 1fr;
            }
        }
        .text-center {
            text-align: center;
        }
        .bold {
            font-weight: bold;
            color: #003366;
        }
        .spacer {
            margin: 2rem 0;
            height: 1px;
            background: #eee;
        }