* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background-color: #0f1a2b;
            color: #e0e0e0;
            line-height: 1.8;
            font-size: 18px;
            overflow-x: hidden;
        }
        a {
            color: #4fc3f7;
            text-decoration: none;
            transition: color 0.3s ease, transform 0.2s ease;
        }
        a:hover {
            color: #29b6f6;
            transform: translateY(-2px);
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
        }
        header {
            background: linear-gradient(135deg, #1a2b4a 0%, #0f1a2b 100%);
            padding: 1.5rem 2rem;
            border-bottom: 3px solid #00bcd4;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1400px;
            margin: 0 auto;
        }
        .my-logo {
            font-size: 2.5rem;
            font-weight: 900;
            background: linear-gradient(90deg, #00bcd4, #4fc3f7);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 2px 10px rgba(79, 195, 247, 0.3);
        }
        .my-logo:hover {
            animation: glow 1s infinite alternate;
        }
        @keyframes glow {
            from { text-shadow: 0 2px 10px rgba(79, 195, 247, 0.3); }
            to { text-shadow: 0 2px 20px rgba(79, 195, 247, 0.7); }
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-links a {
            font-size: 1.1rem;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 5px;
        }
        .nav-links a:hover {
            background-color: rgba(79, 195, 247, 0.1);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: #4fc3f7;
        }
        .breadcrumb {
            padding: 1rem 2rem;
            background-color: #1a2b4a;
            max-width: 1400px;
            margin: 0 auto;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.5rem;
            color: #4fc3f7;
        }
        main {
            max-width: 1400px;
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        .content {
            background-color: #1a2b4a;
            padding: 2.5rem;
            border-radius: 15px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
        }
        .sidebar {
            background-color: #1a2b4a;
            padding: 1.5rem;
            border-radius: 15px;
            height: fit-content;
            position: sticky;
            top: 120px;
        }
        h1 {
            font-size: 3.5rem;
            color: #00bcd4;
            margin-bottom: 1.5rem;
            text-align: center;
            text-shadow: 0 2px 10px rgba(0, 188, 212, 0.5);
            border-bottom: 3px solid #00bcd4;
            padding-bottom: 1rem;
        }
        h2 {
            font-size: 2.5rem;
            color: #4fc3f7;
            margin: 2.5rem 0 1.5rem;
            padding-left: 1rem;
            border-left: 5px solid #4fc3f7;
        }
        h3 {
            font-size: 2rem;
            color: #81d4fa;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.5rem;
            color: #b3e5fc;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            padding: 0 0.5rem;
        }
        .highlight {
            background-color: rgba(0, 188, 212, 0.1);
            border-left: 4px solid #00bcd4;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 10px 10px 0;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.3rem;
        }
        ul, ol {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.8rem;
        }
        form {
            background-color: #0f1a2b;
            padding: 1.5rem;
            border-radius: 10px;
            margin-bottom: 2rem;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            color: #81d4fa;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            background-color: #1a2b4a;
            border: 2px solid #4fc3f7;
            border-radius: 5px;
            color: #e0e0e0;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #00bcd4;
        }
        button {
            background: linear-gradient(90deg, #00bcd4, #4fc3f7);
            color: #0f1a2b;
            border: none;
            padding: 0.8rem 1.5rem;
            font-size: 1.1rem;
            font-weight: bold;
            border-radius: 5px;
            cursor: pointer;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        button:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 188, 212, 0.4);
        }
        footer {
            background-color: #0a121f;
            padding: 3rem 2rem;
            margin-top: 3rem;
            border-top: 3px solid #00bcd4;
        }
        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h3 {
            color: #00bcd4;
            margin-bottom: 1.5rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
            padding: 0.5rem;
            background-color: #1a2b4a;
            border-radius: 5px;
            transition: background-color 0.3s ease;
        }
        friend-link:hover {
            background-color: #2a3b5a;
        }
        .copyright {
            text-align: center;
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid #1a2b4a;
            color: #81d4fa;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            main {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                align-items: flex-start;
                gap: 1rem;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background-color: #1a2b4a;
                padding: 1rem;
                border-radius: 10px;
                margin-top: 1rem;
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 2rem;
            }
            h1 {
                font-size: 2.5rem;
            }
            h2 {
                font-size: 2rem;
            }
            .content, .sidebar {
                padding: 1.5rem;
            }
        }
        .text-center {
            text-align: center;
        }
        .bold {
            font-weight: 900;
            color: #00bcd4;
        }
        .update-time {
            color: #81d4fa;
            font-style: italic;
            font-size: 0.9rem;
            margin-top: 1rem;
        }