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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    line-height: 1.6;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 2rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2.5rem;
    background-color: white;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 2.5rem;
    font-size: 2.2rem;
    font-weight: 600;
}

.input-section {
    margin-bottom: 2.5rem;
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 12px;
}

.form-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

input, select, button {
    padding: 0.75rem;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: #4CAF50;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

input[type="text"] {
    flex: 2;
}

input[type="number"], select {
    flex: 1;
}

.scoring-system {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.scoring-system button {
    padding: 0.75rem 1.5rem;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(76, 175, 80, 0.2);
}

.scoring-system button:hover {
    background-color: #45a049;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(76, 175, 80, 0.3);
}

.courses-list {
    margin-bottom: 2.5rem;
    background-color: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #2c3e50;
}

tr:hover {
    background-color: #f8f9fa;
}

.delete-btn {
    background-color: #ff4444;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.delete-btn:hover {
    background-color: #cc0000;
    transform: scale(1.05);
}

.calculate-btn {
    display: block;
    width: 100%;
    padding: 1.2rem;
    font-size: 1.2rem;
    font-weight: 600;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 6px rgba(76, 175, 80, 0.2);
}

.calculate-btn:hover {
    background-color: #45a049;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(76, 175, 80, 0.3);
}

.gpa-result {
    text-align: center;
    font-size: 2rem;
    font-weight: bold;
    color: #2c3e50;
    padding: 1.5rem;
    background-color: #f8f9fa;
    border-radius: 10px;
    transition: all 0.3s ease;
}

@media (max-width: 768px) {
    .form-group {
        flex-direction: column;
    }
    
    input[type="text"],
    input[type="number"],
    select {
        flex: none;
        width: 100%;
    }
    
    .container {
        padding: 1.5rem;
    }
}