/* Modern Calculator Design System */
:root {
    --primary-color: #4f46e5;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --dark-color: #1f2937;
    --light-color: #f9fafb;
    --border-radius: 12px;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    color: #333;
}

.calculator-wrapper {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.calculator-container {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: var(--transition);
}

.calculator-container:hover {
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.calculator-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--light-color);
}

.calculator-header h1 {
    color: var(--dark-color);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.calculator-header p {
    color: #6b7280;
    font-size: 1.1rem;
    margin: 0;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.btn-calculate {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, #6366f1 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.5);
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.5);
}

.btn-calculate:active {
    transform: translateY(0);
}

.result-container {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-top: 2rem;
    color: white;
    text-align: center;
    display: none;
    animation: slideIn 0.5s ease;
}

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

.result-value {
    font-size: 3rem;
    font-weight: 700;
    margin: 1rem 0;
}

.result-label {
    font-size: 1.2rem;
    opacity: 0.9;
}

.info-card {
    background: var(--light-color);
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.info-card h3 {
    color: var(--dark-color);
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.info-card p {
    color: #4b5563;
    line-height: 1.7;
}

.seo-content {
    background: white;
    border-radius: var(--border-radius);
    padding: 2.5rem;
    margin-top: 2rem;
    box-shadow: var(--box-shadow);
}

.seo-content h2 {
    color: var(--dark-color);
    font-size: 1.8rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.seo-content h3 {
    color: var(--dark-color);
    font-size: 1.4rem;
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    font-weight: 600;
}

.seo-content p {
    color: #4b5563;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.seo-content ul, .seo-content ol {
    color: #4b5563;
    line-height: 1.8;
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.faq-section {
    margin-top: 3rem;
}

.faq-item {
    background: var(--light-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--box-shadow);
}

.faq-question {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.faq-answer {
    color: #6b7280;
    line-height: 1.7;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.feature-card {
    background: var(--light-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-title {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.feature-description {
    color: #6b7280;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .calculator-header h1 {
        font-size: 1.5rem;
    }
    
    .calculator-container {
        padding: 1.5rem;
    }
    
    .result-value {
        font-size: 2rem;
    }
    
    .seo-content {
        padding: 1.5rem;
    }
}

/* Table Styles */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.comparison-table th {
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

.comparison-table td {
    padding: 1rem;
    border-bottom: 1px solid #e5e7eb;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table tr:hover {
    background: var(--light-color);
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 30px;
    background: #e5e7eb;
    border-radius: 15px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    transition: width 1s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

/* Alert Boxes */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
    border-left: 4px solid;
}

.alert-info {
    background: #dbeafe;
    border-color: var(--info-color);
    color: #1e40af;
}

.alert-success {
    background: #d1fae5;
    border-color: var(--secondary-color);
    color: #065f46;
}

.alert-warning {
    background: #fef3c7;
    border-color: var(--warning-color);
    color: #92400e;
}

.alert-danger {
    background: #fee2e2;
    border-color: var(--danger-color);
    color: #991b1b;
}

/* Input Groups */
.input-group {
    display: flex;
    gap: 0.5rem;
}

.input-group .form-control {
    flex: 1;
}

.input-addon {
    background: var(--light-color);
    border: 2px solid #e5e7eb;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    font-weight: 600;
    color: #6b7280;
}

/* Toggle Switch */
.toggle-switch {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
}

.toggle-switch input {
    position: relative;
    width: 50px;
    height: 26px;
    appearance: none;
    background: #e5e7eb;
    border-radius: 13px;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
}

.toggle-switch input:checked {
    background: var(--primary-color);
}

.toggle-switch input:before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    background: white;
    transition: var(--transition);
}

.toggle-switch input:checked:before {
    transform: translateX(24px);
}

/* Radio & Checkbox Styles */
.radio-group, .checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.radio-option, .checkbox-option {
    flex: 1;
    min-width: 150px;
}

.radio-option input, .checkbox-option input {
    display: none;
}

.radio-option label, .checkbox-option label {
    display: block;
    padding: 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    font-weight: 500;
}

.radio-option input:checked + label,
.checkbox-option input:checked + label {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.radio-option label:hover,
.checkbox-option label:hover {
    border-color: var(--primary-color);
}