* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            padding-top: 80px; 
        }
        a {
            color: #4a6ee0;
            text-decoration: none;
            transition: color 0.3s ease, transform 0.2s ease;
        }
        a:hover {
            color: #ff66a3;
            transform: translateY(-2px);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        ul, ol {
            padding-left: 2rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .main-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            z-index: 1000;
            padding: 15px 0;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(90deg, #ff66a3, #4a6ee0);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            font-size: 2.5rem;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .main-nav a {
            font-weight: 600;
            font-size: 1.1rem;
            padding: 8px 15px;
            border-radius: 25px;
        }
        .main-nav a:hover {
            background: #f0f5ff;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: #4a6ee0;
        }
        .breadcrumb {
            padding: 15px 0;
            font-size: 0.9rem;
            color: #666;
            margin-bottom: 20px;
        }
        .breadcrumb a {
            color: #666;
        }
        .breadcrumb a:hover {
            color: #ff66a3;
        }
        main {
            background: white;
            border-radius: 20px;
            box-shadow: 0 15px 50px rgba(0, 0, 0, 0.08);
            padding: 40px;
            margin-bottom: 40px;
        }
        h1 {
            font-size: 3.2rem;
            color: #2d3748;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 8px solid #ff66a3;
            padding-left: 20px;
            background: linear-gradient(90deg, #2d3748, #4a5568);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        h2 {
            font-size: 2.4rem;
            color: #4a6ee0;
            margin: 3rem 0 1.5rem;
            padding-bottom: 10px;
            border-bottom: 3px dashed #e2e8f0;
        }
        h3 {
            font-size: 1.8rem;
            color: #ff66a3;
            margin: 2.5rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #38b2ac;
            margin: 2rem 0 0.8rem;
        }
        .content-section {
            margin-bottom: 3rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
            color: #4a5568;
        }
        .highlight {
            background: linear-gradient(120deg, #e0f7fa 0%, #bbdefb 100%);
            border-left: 6px solid #4a6ee0;
            padding: 25px;
            border-radius: 0 15px 15px 0;
            margin: 2rem 0;
            font-size: 1.15rem;
        }
        .emoji {
            font-size: 1.3rem;
            margin-right: 8px;
        }
        .key-term {
            font-weight: 700;
            color: #2d3748;
            background: #fef3c7;
            padding: 2px 8px;
            border-radius: 5px;
        }
        .feature-img {
            margin: 2.5rem auto;
            max-width: 800px;
            text-align: center;
        }
        .feature-img figcaption {
            font-style: italic;
            color: #718096;
            margin-top: 10px;
            font-size: 0.95rem;
        }
        .interactive-box {
            background: #f7fafc;
            border-radius: 15px;
            padding: 30px;
            margin: 3rem 0;
            border: 2px solid #e2e8f0;
        }
        .interactive-box h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #4a5568;
        }
        input, textarea, select {
            width: 100%;
            padding: 15px;
            border: 2px solid #cbd5e0;
            border-radius: 10px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #4a6ee0;
            box-shadow: 0 0 0 3px rgba(74, 110, 224, 0.2);
        }
        .rating-stars {
            display: flex;
            gap: 10px;
            margin: 15px 0;
        }
        .star {
            font-size: 2rem;
            color: #cbd5e0;
            cursor: pointer;
            transition: color 0.3s ease, transform 0.2s ease;
        }
        .star:hover,
        .star.active {
            color: #ffc107;
            transform: scale(1.2);
        }
        .btn {
            display: inline-block;
            background: linear-gradient(90deg, #4a6ee0, #ff66a3);
            color: white;
            border: none;
            padding: 15px 35px;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            box-shadow: 0 6px 20px rgba(74, 110, 224, 0.3);
        }
        .btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 25px rgba(74, 110, 224, 0.4);
        }
        .internal-links {
            background: #edf2f7;
            padding: 25px;
            border-radius: 15px;
            margin: 2.5rem 0;
        }
        .internal-links h3 {
            margin-top: 0;
        }
        .internal-links ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 15px;
            list-style: none;
            padding-left: 0;
        }
        .internal-links li {
            padding: 12px 20px;
            background: white;
            border-radius: 10px;
            transition: transform 0.3s ease;
        }
        .internal-links li:hover {
            transform: translateX(10px);
        }
        footer {
            background: #2d3748;
            color: #cbd5e0;
            padding: 50px 0 30px;
            border-top: 8px solid #ff66a3;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 800;
            color: white;
            margin-bottom: 20px;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin: 20px 0;
        }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 8px 20px;
            border-radius: 20px;
            transition: background 0.3s ease;
        }
        friend-link a {
            color: #90cdf4;
        }
        friend-link:hover {
            background: rgba(255,255,255,0.2);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 30px;
            border-top: 1px solid #4a5568;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        .last-updated {
            text-align: right;
            font-style: italic;
            color: #718096;
            margin-top: 40px;
            font-size: 0.95rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.8rem; }
            h2 { font-size: 2.1rem; }
            .main-nav ul { gap: 15px; }
        }
        @media (max-width: 768px) {
            body { padding-top: 70px; }
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 70px;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                padding: 20px;
                box-shadow: 0 10px 30px rgba(0,0,0,0.1);
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: all 0.4s ease;
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav a {
                display: block;
                padding: 15px;
                border-bottom: 1px solid #e2e8f0;
            }
            .main-nav a:last-child { border-bottom: none; }
            main { padding: 25px; }
            .container { padding: 0 15px; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .interactive-box { padding: 20px; }
            .btn { padding: 12px 25px; }
        }