* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', sans-serif;
            background: linear-gradient(to bottom, #f8fafc, #ffffff);
            color: #0f172a;
            line-height: 1.6;
        }

        h1, h2, h3 {
            font-family: 'Playfair Display', serif;
        }

        /* Scrollbar Styles */
        ::-webkit-scrollbar {
            width: 10px;
        }

        ::-webkit-scrollbar-track {
            background: #f1f5f9;
            border-radius: 5px;
        }

        ::-webkit-scrollbar-thumb {
            background: #64748b;
            border-radius: 5px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: #475569;
        }

        html {
            scroll-behavior: smooth;
        }

        /* Navbar */
        .navbar-wrapper {
            position: sticky;
            top: 16px;
            z-index: 1000;
            padding: 0 16px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .navbar {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            border-radius: 50px;
            padding: 12px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo-section {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .logo {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            object-fit: cover;
        }

        .logo-text {
            font-weight: 600;
            color: #1e293b;
        }

        .nav-menu {
            display: flex;
            gap: 24px;
            list-style: none;
            align-items: center;
        }

        .nav-menu a {
            text-decoration: none;
            color: #475569;
            font-weight: 500;
            transition: color 0.3s;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .nav-menu a:hover {
            color: #3b82f6;
        }

        .dropdown {
            position: relative;
        }

        .dropdown-toggle {
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .dropdown-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            margin-top: 8px;
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            min-width: 150px;
            padding: 8px 0;
        }

        .dropdown-menu a {
            display: block;
            padding: 10px 16px;
            color: #475569;
            text-decoration: none;
            transition: all 0.3s;
        }

        .dropdown-menu a:hover {
            background: #eff6ff;
            color: #3b82f6;
        }

        .dropdown.active .dropdown-menu {
            display: block;
        }

        /* Hero Section */
         .hero {
            position: relative;
            min-height: 500px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 80px 20px;
            background-image: url('image/billy-huynh-W8KTS-mhFUE-unsplash\ \(1\).jpg');
            background-size: cover;
            background-position: center;
        }

  @media (max-width: 600px) {
    .hero {
        min-height: 380px;
        background-position: center top;
        padding: 60px 15px;
    }
}



        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to bottom, rgba(0,0,0,0.4), rgba(0,0,0,0.3), rgba(0,0,0,0.5));
        }

        .hero-content {
            position: relative;
            z-index: 10;
            max-width: 900px;
        }

        .hero h1 {
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 700;
            color: white;
            margin-bottom: 16px;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }

        .hero h2 {
            font-size: clamp(1.5rem, 4vw, 2.5rem);
            font-weight: 600;
            color: white;
            margin-bottom: 24px;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }

        .hero p {
            font-size: clamp(1rem, 2vw, 1.25rem);
            color: rgba(255, 255, 255, 0.9);
            text-shadow: 1px 1px 4px rgba(0,0,0,0.3);
        }

        /* Subjects Section */
        .subjects-section {
            padding: 64px 20px;
            max-width: 1400px;
            margin: 0 auto;
        }

        .subjects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        @media (min-width: 768px) {
            .subjects-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .subjects-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .subject-card {
            background: white;
            border-radius: 16px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .subject-card:hover {
            transform: scale(1.05);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
        }

        .subject-image {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
        }

        .subject-content {
            padding: 24px;
            text-align: center;
        }

        .subject-title {
            font-size: 1.25rem;
            font-weight: 600;
            color: #0f172a;
            margin-bottom: 20px;
            min-height: 3rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .start-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #1e293b;
            color: white;
            padding: 12px 24px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
        }

        .start-btn:hover {
            background: #0f172a;
            transform: scale(1.05);
        }

        /* Important Links */
        .links-section {
            padding: 64px 20px;
            background: white;
            text-align: center;
        }

        .links-section h2 {
            font-size: 2.5rem;
            margin-bottom: 16px;
            color: #0f172a;
        }

        .links-section p {
            color: #64748b;
            margin-bottom: 48px;
        }

        .links-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 48px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .link-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            transition: transform 0.3s;
        }

        .link-item:hover {
            transform: scale(1.1);
        }

        .link-logo {
            width: 96px;
            height: 96px;
            border-radius: 50%;
            object-fit: cover;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            transition: box-shadow 0.3s;
        }

        .link-item:hover .link-logo {
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
        }

        .link-name {
            font-weight: 500;
            color: #475569;
            transition: color 0.3s;
        }

        .link-item:hover .link-name {
            color: #3b82f6;
        }

        /* Footer */
        .footer {
            background: linear-gradient(to right, #1e3a8a, #7c2d92, #c2410c);
            color: white;
            padding: 48px 20px;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-section {
            text-align: center;
        }

        .footer-logo {
            width: 80px;
            height: 80px;
            border-radius: 12px;
            object-fit: cover;
            margin: 0 auto 16px;
        }

        .footer h3 {
            font-size: 1.25rem;
            margin-bottom: 16px;
        }

        .footer p {
            color: rgba(255, 255, 255, 0.9);
            line-height: 1.8;
            margin-bottom: 16px;
        }

        .social-icons {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin: 16px 0;
        }

        .social-icon {
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            color: white;
            transition: background 0.3s;
        }

        .social-icon:hover {
            background: rgba(255, 255, 255, 0.3);
        }

        .quick-links {
            list-style: none;
        }

        .quick-links li {
            margin-bottom: 8px;
        }

        .quick-links a {
            color: rgba(255, 255, 255, 0.9);
            text-decoration: none;
            transition: color 0.3s;
        }

        .quick-links a:hover {
            color: white;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.2);
            padding-top: 24px;
            text-align: center;
        }

        .footer-bottom p {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 8px;
        }

        /* Mobile Menu Toggle */
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: #1e293b;
        }

        @media (max-width: 768px) {
            .logo-text {
                display: none;
            }

            .nav-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                padding: 20px;
                border-radius: 20px;
                margin-top: 10px;
                box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            }

            .nav-menu.active {
                display: flex;
            }

            .mobile-menu-toggle {
                display: block;
            }

            .navbar {
                position: relative;
            }

        }