.calculator-page {
    padding: 50px 0;
    background-color: var(--dark-bg);
}
.calculator-container {
    background-color: var(--light-bg);
    border-radius: 20px;
    padding: 30px 40px;
    box-shadow: 0 15px 45px rgba(0, 0, 0, 0.3);
    max-width: 1200px;
    margin: 0 auto;
}
.calculator-header {
    text-align: center;
    margin-bottom: 30px;
}
.calculator-header h1 {
    font-size: 2.2rem;
    color: var(--text-color);
    margin-bottom: 10px;
}
.calculator-header h1 i {
    color: var(--primary-color);
    margin-left: 10px;
}
.calculator-header p {
    font-size: 1.1rem;
    color: var(--light-text-color);
}
.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
    border-bottom: 1px solid #333;
}
.tab-btn {
    padding: 15px 30px;
    cursor: pointer;
    background-color: transparent;
    border: none;
    color: var(--light-text-color);
    font-size: 1.1rem;
    font-weight: 500;
    font-family: var(--font-family);
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    position: relative;
    top: 1px;
}
.tab-btn i {
    margin-left: 8px;
}
.tab-btn:hover {
    color: var(--primary-color);
}
.tab-btn.active {
    color: var(--secondary-color);
    border-bottom-color: var(--secondary-color);
    font-weight: 700;
}
.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}
.tab-content.active {
    display: block;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.form-group, .form-group-compound {
    display: flex;
    flex-direction: column;
}
.form-group label, .form-group-compound label {
    margin-bottom: 10px;
    font-size: 0.95rem;
    color: var(--light-text-color);
    font-weight: 500;
}
.form-group input, .input-group input, .input-group select {
    text-align: center;
    width: 100%;
    padding: 12px 15px;
    background-color: var(--dark-bg);
    border: 1px solid #444;
    border-radius: 8px;
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}
.input-group select {
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a7a9be' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: left 1rem center;
    padding-left: 30px;
}
.form-group input:focus, .input-group input:focus, .input-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}
.input-group {
    display: flex;
    gap: 10px;
}
.input-group input {
    text-align: center;
}
input[type=number]::-webkit-inner-spin-button, 
input[type=number]::-webkit-outer-spin-button { 
  -webkit-appearance: none; 
  margin: 0; 
}
input[type=number] {
  -moz-appearance: textfield;
}
.btn-secondary {
    background: transparent;
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    padding: 0 20px;
    width: auto;
    font-size: 0.95rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-block;
    font-family:inherit;
}
.btn-secondary:hover {
    background-color: var(--secondary-color);
    color: #fff;
}
.btn-primary {
    display: inline-block;
    padding: 15px 50px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 50px;
    background-image: linear-gradient(45deg, var(--primary-color), #2980b9);
    color: #fff;
    border: none;
    cursor: pointer;
    box-shadow: 0 5px 20px rgba(52, 152, 219, 0.4);
    transition: all 0.3s ease;
    font-family:inherit;
}
.btn-primary:hover{
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(52, 152, 219, 0.5);
}
.table-container {
    margin-top: 40px;
    margin-bottom: 30px;
}
.table-container h3 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.5rem;
    color: var(--text-color);
}
.installments-table {
    width: 100%;
    border-collapse: collapse;
    direction: rtl;
}
.installments-table th, .installments-table td {
    padding: 5px;
    text-align: center;
    border-bottom: 1px solid #333;
}
.installments-table thead {
    background-color: rgba(0,0,0,0.2);
}
.installments-table th {
    font-weight: 600;
    color: var(--light-text-color);
}
.installments-table tbody tr:nth-child(even) {
    background-color: rgba(255, 255, 255, 0.02);
}
.installments-table tbody tr:hover {
    background-color: rgba(52, 152, 219, 0.1);
}
.delete-btn {
    background: transparent;
    border: none;
    color: #e74c3c;
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.3s, transform 0.3s;
}
.delete-btn:hover {
    color: #c0392b;
    transform: scale(1.2);
}
.final-calculation-section {
    
    text-align: center;
}
.final-calculation-section .form-group {
    max-width: 400px;
    margin: 0 auto 20px auto;
}
.results-summary {
    display: none;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 30px;
    padding: 20px;
    background-color: var(--dark-bg);
    border-radius: 10px;
    animation: fadeIn 0.5s;
}
.result-item {
    background-color: var(--light-bg);
    padding: 5px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid #444;
}
.result-item span {
    display: block;
    font-size: 1rem;
    color: var(--light-text-color);
    margin-bottom: 10px;
}
.result-item strong {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-color);
    direction: ltr;
}
.result-item.highlight strong {
    color: var(--secondary-color);
}
.result-item.highlight-negative strong {
    color: #e74c3c;
}
.single-row-form {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: flex-end;
    background-color: var(--dark-bg);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 30px;
}
.single-row-form .form-group,
.single-row-form .form-group-compound {
    flex-grow: 1;
    flex-basis: 180px;
    margin-bottom: 0;
}
.single-row-form .form-group-narrow { /* NEW */
    flex-grow: 0;
    flex-basis: 120px;
}
.single-row-form .form-group-narrow input { /* NEW */
    text-align: center;
    padding-left: 15px; /* Reset padding for centered text */
}
.single-row-form label {
    font-size: 0.9rem;
    white-space: nowrap;
}
.single-row-form .button-group {
    flex-grow: 0;
    flex-basis: auto;
}
.single-row-form .btn-secondary,
.single-row-form .btn-primary {
    width: 100%;
    padding-top: 13px;
    padding-bottom: 13px;
    margin: 0;
}
@media (max-width: 992px) {
    .single-row-form .form-group,
    .single-row-form .form-group-compound {
        flex-basis: 180px;
    }
}
@media (max-width: 768px) {
    .calculator-container {
        padding: 20px;
    }
    .tabs {
        flex-wrap: wrap;
    }
    .tab-btn {
        padding: 12px 20px;
        font-size: 1rem;
    }
}
@media (max-width: 480px) {
    .calculator-header h1 {
        font-size: 1.8rem;
    }
    .results-summary {
        grid-template-columns: 1fr;
    }
}