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

        :root {
            --primary: #1e7f5c;
            --secondary: #10b981;
            --accent: #8b5cf6;
            --bg: #ffffff;
            --bg-alt: #f9fafb;
            --text: #111827;
            --text-light: #6b7280;
            --border: #e5e7eb;
            --radius: 1rem;
            --radius-lg: 1.5rem;
            --radius-full: 9999px;
            --transition: all 0.3s ease;
        }

        body {
            font-family: 'Poppins', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            padding: 1rem 0;
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 2rem;
        }

        .logo {
            display: flex;
            align-items: center;
            text-decoration: none;
        }

        .logo img {
            height: 50px;
        }

        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
            align-items: center;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text);
            font-weight: 500;
            transition: var(--transition);
        }

        .nav-links a:hover {
            color: var(--accent);
        }

        .auth-buttons {
            display: flex;
            gap: 0.75rem;
        }

        .mobile-auth {
            display: none;
        }

        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 6px;
            cursor: pointer;
            padding: 0.5rem;
            background: var(--bg-alt);
            border: 2px solid var(--border);
            border-radius: 8px;
            z-index: 1002;
            position: relative;
        }

        .mobile-toggle span {
            width: 28px;
            height: 3px;
            background: var(--text);
            border-radius: 3px;
            transition: var(--transition);
        }

        .btn {
            padding: 0.875rem 1.75rem;
            border-radius: var(--radius-full);
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-student {
            background: linear-gradient(135deg, #2563eb, #3b82f6);
            color: white;
            box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
        }

        .btn-student:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
        }

        .btn-teacher {
            background: linear-gradient(135deg, var(--secondary), #34d399);
            color: white;
            box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
        }

        .btn-teacher:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
        }

        .btn-parent {
            background: linear-gradient(135deg, #8b5cf6, #a78bfa);
            color: white;
            box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
        }

        .btn-parent:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(139, 92, 246, 0.4);
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--accent), #a78bfa);
            color: white;
        }

        .btn-white {
            background: white;
            color: var(--accent);
        }

        .btn-outline {
            background: transparent;
            border: 2px solid white;
            color: white;
        }

        .hero-section {
            padding: 180px 0 100px;
            background: linear-gradient(135deg, var(--accent), #a78bfa);
            color: white;
        }

        .hero-content h1 {
            font-family: 'Montserrat', sans-serif;
            font-size: clamp(2.5rem, 6vw, 4rem);
            font-weight: 900;
            margin-bottom: 1.5rem;
        }

        .hero-content p {
            font-size: 1.25rem;
            margin-bottom: 2rem;
        }

        .features-section {
            padding: 100px 0;
            background: var(--bg-alt);
        }

        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }

        .section-header h2 {
            font-family: 'Montserrat', sans-serif;
            font-size: clamp(2rem, 5vw, 3rem);
            font-weight: 900;
            margin-bottom: 1rem;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }

        .feature-card {
            background: white;
            border: 2px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            border-color: var(--accent);
        }

        .feature-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--accent), #a78bfa);
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            color: white;
            margin-bottom: 1.5rem;
        }

        .footer {
            background: var(--bg-alt);
            padding: 3rem 0 1.5rem;
            text-align: center;
            border-top: 2px solid var(--border);
        }

        .whatsapp-float {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, #25D366, #128C7E);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 2rem;
            z-index: 999;
        }

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

            .nav-links .mobile-auth {
                display: flex !important;
            }

            .desktop-auth {
                display: none;
            }

            .mobile-toggle {
                display: flex;
            }

            .nav-links.active {
                display: flex;
                position: fixed;
                top: 0 !important;
                left: 0 !important;
                right: 0 !important;
                bottom: 0 !important;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 2rem;
                z-index: 1001;
                padding: 2rem;
                margin: 0 !important;
                width: 100vw !important;
                height: 100vh !important;
                overflow-y: auto;
            }

            .nav-links.active a {
                font-size: 1.5rem;
                font-weight: 700;
                padding: 0.75rem 1.5rem;
                border-radius: var(--radius-full);
                color: var(--text);
                text-align: center;
            }

            .nav-links.active a::after {
                display: none;
            }

            .nav-links.active a:hover {
                background: var(--primary);
                color: white;
                transform: scale(1.05);
            }

            .nav-links.active a:hover::after {
                display: none;
            }

            .nav-links.active .auth-buttons {
                flex-direction: column;
                width: 85%;
                max-width: 320px;
                gap: 1rem;
            }

            .nav-links.active .auth-buttons .btn {
                width: 100%;
                justify-content: center;
                white-space: nowrap;
                padding: 1rem 1.5rem;
                font-size: 1rem;
            }

            .logo img {
                height: 35px;
            }

            .hero-section {
                padding: 140px 0 60px;
            }
        }