.yumurtlama-calculator {
    --primary: #ec4899;
    --primary-soft: #fdf2f8;
    --secondary: #f472b6;
    --text-dark: #374151;

    max-width: 800px;
    margin: 2rem auto;
    background: #fff;
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 40px rgba(236, 72, 153, 0.05);
}

.calculator-header h2 {
    color: var(--primary);
    font-size: 2rem;
    font-weight: 800;
}

.form-control {
    border: 1.5px solid #f9a8d4;
    border-radius: 12px;
    padding: 0.8rem;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(236, 72, 153, 0.1);
}

.btn-primary {
    background: linear-gradient(to right, #ec4899, #db2777);
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 700;
    width: 100%;
}

.calculator-result {
    margin-top: 3rem;
    animation: fadeIn 0.8s ease;
}

.ovulation-summary {
    text-align: center;
}

.main-ovulation-day {
    background: var(--primary-soft);
    padding: 2.5rem;
    border-radius: 24px;
    margin-bottom: 2rem;
}

.main-ovulation-day h4 {
    color: #9c174d;
    margin-bottom: 0.5rem;
}

.date-val {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--primary);
}

.fertile-window {
    background: #fff;
    padding: 2rem;
    border: 2px solid var(--primary-soft);
    border-radius: 20px;
    margin-bottom: 2rem;
}

.fertile-window h5 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.fertile-window p {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.fertility-bar {
    display: flex;
    height: 40px;
    border-radius: 20px;
    overflow: hidden;
    background: #f1f5f9;
}

.bar-segment {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
}

.low {
    background: #cbd5e1;
}

.high {
    background: #f472b6;
}

.peak {
    background: #ec4899;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.1);
}

.next-period-box {
    display: flex;
    justify-content: space-around;
    gap: 1rem;
    margin-top: 2rem;
}

.info-item {
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: 16px;
    flex: 1;
}

.info-item span {
    display: block;
    font-size: 0.85rem;
    color: #64748b;
    margin-bottom: 0.5rem;
}

.info-item strong {
    display: block;
    font-size: 1.1rem;
    color: var(--text-dark);
}

@media (max-width: 640px) {
    .next-period-box {
        flex-direction: column;
    }

    .date-val {
        font-size: 1.8rem;
    }
}