.permutasyon-kombinasyon-calculator {
    --primary: #f59e0b;
    --secondary: #fbbf24;
    --accent: #d97706;

    max-width: 800px;
    margin: 2rem auto;
    background: #fff;
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.1);
}

.permutasyon-kombinasyon-calculator .calculator-header h2 {
    color: var(--accent);
    font-weight: 800;
}

.permutasyon-kombinasyon-calculator .form-control {
    border: 2px solid #fef3c7;
    border-radius: 12px;
    padding: 0.8rem;
    font-size: 1.1rem;
    font-weight: 700;
}

.permutasyon-kombinasyon-calculator .btn-primary {
    background: var(--primary);
    border: none;
    font-weight: 700;
    padding: 1rem;
    border-radius: 12px;
}

.prob-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.prob-card {
    background: #fffbeb;
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    border: 2px solid #fde68a;
    transition: all 0.3s ease;
}

.prob-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.card-label {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.card-val {
    font-size: 2.5rem;
    font-weight: 900;
    color: #1e293b;
    overflow-wrap: break-word;
}

.card-formula {
    font-size: 0.75rem;
    color: #92400e;
    font-family: monospace;
    margin-top: 0.5rem;
}

.explanation-box {
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: 12px;
    font-size: 0.95rem;
    line-height: 1.6;
    color: #475569;
}

.explanation-box h5 {
    color: #1e293b;
    margin-bottom: 0.75rem;
}

@media (max-width: 640px) {
    .prob-cards {
        grid-template-columns: 1fr;
    }
}