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

        body {
            font-family: 'Arial', sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            overflow-x: hidden;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            text-align: center;
            color: white;
            margin-bottom: 40px;
            animation: fadeInDown 1s ease-out;
        }

        .header h1 {
            font-size: 3rem;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .header p {
            font-size: 1.2rem;
            opacity: 0.9;
        }

        .calculator-card {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            padding: 40px;
            margin: 20px 0;
            animation: fadeInUp 1s ease-out 0.3s both;
            transform: translateY(50px);
        }

        .info-section {
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            color: white;
            border-radius: 15px;
            padding: 30px;
            margin-bottom: 30px;
            animation: slideInLeft 1s ease-out 0.5s both;
        }

        .info-section h2 {
            font-size: 1.8rem;
            margin-bottom: 20px;
            text-align: center;
        }

        .grade-table {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
            gap: 10px;
            margin: 20px 0;
        }

        .grade-item {
            background: rgba(255,255,255,0.2);
            padding: 10px;
            border-radius: 8px;
            text-align: center;
            font-weight: bold;
            transition: transform 0.3s ease;
        }

        .grade-item:hover {
            transform: scale(1.05);
            background: rgba(255,255,255,0.3);
        }

        .input-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }

        .input-group {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 12px;
            border-left: 4px solid #667eea;
        }

        .input-group h3 {
            color: #333;
            margin-bottom: 15px;
            font-size: 1.2rem;
        }

        .subject-input {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin: 10px 0;
            padding: 10px;
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        .subject-input label {
            font-weight: 600;
            color: #555;
        }

        .subject-input select {
            padding: 8px 12px;
            border: 2px solid #ddd;
            border-radius: 6px;
            background: white;
            color: #333;
            font-weight: 600;
            transition: border-color 0.3s ease;
        }

        .subject-input select:focus {
            outline: none;
            border-color: #667eea;
        }

        .jamb-input {
            display: flex;
            flex-direction: column;
        }

        .jamb-input input {
            padding: 15px;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1.1rem;
            margin-top: 10px;
            transition: border-color 0.3s ease;
        }

        .jamb-input input:focus {
            outline: none;
            border-color: #667eea;
        }

        .calculate-btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 18px 40px;
            border: none;
            border-radius: 50px;
            font-size: 1.2rem;
            font-weight: bold;
            cursor: pointer;
            display: block;
            margin: 30px auto;
            transition: all 0.3s ease;
            box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
        }

        .calculate-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(102, 126, 234, 0.4);
        }

        .calculate-btn:active {
            transform: translateY(0);
        }

        /* Modal Styles */
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.5);
            animation: fadeIn 0.3s ease-out;
        }

        .modal-content {
            background-color: white;
            margin: 5% auto;
            padding: 30px;
            border-radius: 20px;
            width: 90%;
            max-width: 500px;
            text-align: center;
            animation: slideInUp 0.5s ease-out;
            position: relative;
        }

        .close {
            position: absolute;
            right: 20px;
            top: 15px;
            color: #aaa;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
            transition: color 0.3s ease;
        }

        .close:hover {
            color: #667eea;
        }

        .result-score {
            font-size: 3rem;
            font-weight: bold;
            color: #667eea;
            margin: 20px 0;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }

        .whatsapp-btn {
            background: #25D366;
            color: white;
            padding: 15px 30px;
            border: none;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: bold;
            cursor: pointer;
            margin: 20px 0;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }

        .whatsapp-btn:hover {
            background: #128C7E;
            transform: scale(1.05);
        }

        .floating-shapes {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: -1;
        }

        .shape {
            position: absolute;
            opacity: 0.1;
            animation: float 6s ease-in-out infinite;
        }

        .shape:nth-child(1) {
            top: 20%;
            left: 10%;
            animation-delay: 0s;
        }

        .shape:nth-child(2) {
            top: 60%;
            right: 10%;
            animation-delay: 2s;
        }

        .shape:nth-child(3) {
            bottom: 20%;
            left: 20%;
            animation-delay: 4s;
        }

        @keyframes fadeInDown {
            from {
                opacity: 0;
                transform: translateY(-30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(50px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes slideInLeft {
            from {
                opacity: 0;
                transform: translateX(-50px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        @keyframes slideInUp {
            from {
                transform: translateY(100px);
            }
            to {
                transform: translateY(0);
            }
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(180deg); }
        }

        @media (max-width: 768px) {
            .header h1 {
                font-size: 2rem;
            }
            
            .calculator-card {
                padding: 20px;
                margin: 10px;
            }
            
            .input-section {
                grid-template-columns: 1fr;
                gap: 15px;
            }
            
            .subject-input {
                flex-direction: column;
                text-align: center;
                gap: 10px;
            }
            
            .modal-content {
                width: 95%;
                margin: 10% auto;
                padding: 20px;
            }
        }

        .note {
            background: #fff3cd;
            border: 1px solid #ffeaa7;
            color: #856404;
            padding: 15px;
            border-radius: 8px;
            margin: 20px 0;
            font-weight: 600;
        }