* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-weight: 800; color: #1a365d; margin-bottom: 1rem; line-height: 1.2; }
        h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); text-align: center; margin-top: 1.5rem;}
        h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); border-bottom: 3px solid #4299e1; padding-bottom: 0.5rem; margin-top: 3rem; }
        h3 { font-size: clamp(1.5rem, 3vw, 1.9rem); color: #2d3748; margin-top: 2.5rem; }
        h4 { font-size: 1.3rem; color: #4a5568; margin-top: 2rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        strong { color: #2b6cb0; }
        em { font-style: italic; color: #718096; }
        .highlight { background-color: #fffbdd; padding: 0.2rem 0.5rem; border-radius: 3px; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        main.container { padding-top: 2rem; padding-bottom: 3rem; }
        header { background: linear-gradient(to right, #1a365d, #2d3748); color: white; padding: 1rem 0; position: sticky; top: 0; z-index: 1000; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
        .header-content { display: flex; justify-content: space-between; align-items: center; }
        .my-logo {
            font-size: 1.8rem; font-weight: 900; color: #63b3ed; text-decoration: none; display: flex; align-items: center; gap: 10px;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }
        .my-logo i { font-size: 2rem; }
        .my-logo:hover { color: #90cdf4; transform: scale(1.03); transition: transform 0.3s ease; }
        .desktop-nav ul { display: flex; list-style: none; gap: 2rem; }
        .desktop-nav a {
            color: #cbd5e0; text-decoration: none; font-weight: 600; padding: 0.5rem 0.8rem; border-radius: 5px; font-size: 1rem;
            transition: all 0.3s ease;
        }
        .desktop-nav a:hover, .desktop-nav a:focus { background-color: #4299e1; color: white; }
        .hamburger { display: none; font-size: 1.8rem; background: none; border: none; color: white; cursor: pointer; }
        .mobile-nav {
            display: none; position: absolute; top: 100%; left: 0; width: 100%; background-color: #2d3748; flex-direction: column; padding: 1rem 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        .mobile-nav.active { display: flex; }
        .mobile-nav ul { list-style: none; width: 100%; }
        .mobile-nav li { width: 100%; }
        .mobile-nav a {
            display: block; color: #e2e8f0; text-decoration: none; padding: 1rem 2rem; font-weight: 600; border-bottom: 1px solid #4a5568; width: 100%;
            transition: background-color 0.3s;
        }
        .mobile-nav a:hover { background-color: #4a5568; }
        .breadcrumb { padding: 1rem 0; background-color: #edf2f7; font-size: 0.9rem; }
        .breadcrumb ol { display: flex; flex-wrap: wrap; list-style: none; }
        .breadcrumb li:not(:last-child)::after { content: '/'; margin: 0 10px; color: #a0aec0; }
        .breadcrumb a { color: #4299e1; text-decoration: none; }
        .breadcrumb a:hover { text-decoration: underline; }
        .featured-img {
            width: 100%; max-height: 500px; object-fit: cover; border-radius: 10px; margin: 2.5rem auto; box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            border: 5px solid white;
        }
        .content-section {
            background: white; padding: 2.5rem; border-radius: 15px; box-shadow: 0 5px 20px rgba(0,0,0,0.08); margin-bottom: 2.5rem;
        }
        .tip-box, .interview-box, .data-box {
            padding: 1.5rem; border-left: 5px solid #4299e1; background-color: #f7fafc; margin: 2rem 0; border-radius: 0 8px 8px 0;
        }
        .interview-box { border-left-color: #38a169; }
        .data-box { border-left-color: #d69e2e; }
        .content-link {
            color: #2b6cb0; font-weight: 600; text-decoration: none; border-bottom: 1px dashed #2b6cb0;
        }
        .content-link:hover { color: #1a365d; border-bottom-style: solid; }
        .interactive-box { margin: 3rem 0; padding: 2rem; background: linear-gradient(to bottom right, #e6fffa, #ebf8ff); border-radius: 12px; border: 1px solid #bee3f8; }
        .interactive-box h3 { text-align: center; }
        .form-grid { display: grid; grid-template-columns: 1fr; gap: 1.5rem; margin-top: 1.5rem; }
        @media(min-width: 768px) {
            .form-grid { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
        }
        .form-group { display: flex; flex-direction: column; }
        .form-group label { margin-bottom: 0.5rem; font-weight: 600; color: #2d3748; }
        .form-group input, .form-group textarea, .form-group select {
            padding: 0.8rem 1rem; border: 1px solid #cbd5e0; border-radius: 8px; font-size: 1rem; transition: border-color 0.3s;
        }
        .form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: #4299e1; box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2); }
        .rating { display: flex; gap: 0.5rem; margin-top: 0.5rem; flex-direction: row-reverse; justify-content: flex-end; }
        .rating input { display: none; }
        .rating label { font-size: 1.8rem; color: #cbd5e0; cursor: pointer; transition: color 0.3s; }
        .rating label:hover, .rating label:hover ~ label, .rating input:checked ~ label { color: #f6ad55; }
        .btn {
            padding: 0.9rem 2rem; background: linear-gradient(to right, #3182ce, #63b3ed); color: white; border: none; border-radius: 8px;
            font-weight: 700; font-size: 1rem; cursor: pointer; transition: all 0.3s ease; align-self: flex-start;
        }
        .btn:hover { background: linear-gradient(to right, #2c5282, #4299e1); transform: translateY(-3px); box-shadow: 0 5px 15px rgba(66, 153, 225, 0.4); }
        footer { background: #1a202c; color: #cbd5e0; padding: 3rem 0 1.5rem; margin-top: 4rem; }
        .footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-bottom: 2rem; }
        .footer-section h4 { color: #90cdf4; margin-bottom: 1.5rem; font-size: 1.3rem; border-bottom: none; }
        friend-link { display: block; margin-bottom: 0.8rem; }
        friend-link a { color: #a0aec0; text-decoration: none; transition: color 0.3s; }
        friend-link a:hover { color: #63b3ed; text-decoration: underline; }
        .copyright {
            text-align: center; padding-top: 1.5rem; border-top: 1px solid #4a5568; font-size: 0.9rem; color: #a0aec0;
        }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .hamburger { display: block; }
            .header-content { padding: 0 15px; }
            .content-section { padding: 1.5rem; }
            h1 { margin-top: 1rem; }
        }