:root {
    --cgpa-primary-color: #7F56D9;
    --cgpa-primary-light: #F9F5FF;
    --cgpa-secondary-color: #101828;
    --cgpa-accent-color: #6941C6;
    --cgpa-success-color: #32D583;
    --cgpa-background-color: #FFFFFF;
    --cgpa-border-color: #E0E0E0;
    --cgpa-text-color: #344054;
}

.cgpa-calculator-card {
    font-family: 'Inter', sans-serif;
    background: var(--cgpa-background-color);
    border-radius: 24px;
    margin: 40px auto;
    box-shadow: 0 24px 48px -12px rgba(16, 24, 40, 0.15);
    padding: 32px;
    width: 100%;
    max-width: 700px;
    position: relative;
    overflow: hidden;
}

.cgpa-calculator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--cgpa-primary-color), var(--cgpa-accent-color));
}

.cgpa-calculator-card h2 {
    color: var(--cgpa-secondary-color);
    font-size: 30px;
    font-weight: 700;
    margin-bottom: 32px;
    text-align: center;
    letter-spacing: -0.02em;
}

.cgpa-form-group {
    margin-bottom: 24px;
}

.cgpa-calculator-card label {
    display: block;
    color: var(--cgpa-secondary-color);
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 8px;
}

.cgpa-calculator-card input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--cgpa-border-color);
    border-radius: 12px;
    font-size: 16px;
    font-weight: 500;
    color: var(--cgpa-secondary-color);
    transition: all 0.3s ease;
    background: var(--cgpa-background-color);
}

.cgpa-calculator-card input:focus {
    outline: none;
    border-color: var(--cgpa-primary-color);
    box-shadow: 0 0 0 4px var(--cgpa-primary-light);
}

.cgpa-scale-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--cgpa-secondary-color);
    margin-bottom: 12px;
    text-align: center;
}

.cgpa-grading-scale {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 32px;
}

.cgpa-grading-scale button {
    background: var(--cgpa-background-color);
    border: 2px solid var(--cgpa-border-color);
    padding: 12px 20px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: var(--cgpa-text-color);
    transition: all 0.3s ease;
    min-width: 100px;
}

.cgpa-grading-scale button:hover {
    border-color: var(--cgpa-primary-color);
    background: var(--cgpa-primary-light);
}

.cgpa-grading-scale button.active {
    background: var(--cgpa-primary-color);
    border-color: var(--cgpa-primary-color);
    color: white;
}

.cgpa-button-group {
    display: flex;
    gap: 16px;
    margin-top: 32px;
}

.cgpa-calculate {
    flex: 1;
    background: var(--cgpa-primary-color);
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.cgpa-calculate:hover {
    background: var(--cgpa-accent-color);
    transform: translateY(-2px);
}

.cgpa-reset {
    background: var(--cgpa-primary-light);
    color: var(--cgpa-primary-color);
    border: none;
    padding: 14px 24px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.cgpa-reset:hover {
    background: #F3EEFF;
}

#cgpa-result {
    margin-top: 32px;
    padding: 24px;
    border-radius: 16px;
    background: var(--cgpa-primary-light);
    display: none;
    transition: all 0.3s ease;
}

#cgpa-result.show {
    display: block;
    animation: cgpaSlideUp 0.5s ease;
}

.cgpa-result-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--cgpa-primary-color);
    margin-bottom: 8px;
    text-align: center;
}

.cgpa-result-details {
    font-size: 14px;
    color: var(--cgpa-text-color);
    text-align: center;
    font-weight: 500;
}

@keyframes cgpaSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .cgpa-calculator-card {
        padding: 24px;
        border-radius: 20px;
    }

    .cgpa-calculator-card h2 {
        font-size: 24px;
        margin-bottom: 24px;
    }

    .cgpa-grading-scale button {
        padding: 10px 16px;
        font-size: 13px;
        min-width: 80px;
    }

    .cgpa-button-group {
        flex-direction: column;
    }

    .cgpa-result-value {
        font-size: 28px;
    }
}