.calculator-intro {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.calculator-intro p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: #4b5563;
    margin-bottom: 3rem;
}

.calculator-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-item {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.06);
    text-align: center;
    border-top: 4px solid var(--accent-color);
}

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

.feature-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.feature-item p {
    color: #64748b;
    font-size: 0.9rem;
    line-height: 1.4;
}

.calculator-main {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-bottom: 5rem;
}

.calculator-container {
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    overflow: hidden;
}

.calculator-section {
    padding: 2rem;
    border-bottom: 1px solid #f1f5f9;
}

.calculator-section:last-child {
    border-bottom: none;
}

.calculator-section h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.project-types {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.project-type-card {
    background: #f8fafc;
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.project-type-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.project-type-card.active {
    border-color: var(--accent-color);
    background: #e0f2fe;
}

.type-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.project-type-card h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.project-type-card p {
    color: #64748b;
    font-size: 0.9rem;
    line-height: 1.4;
}

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

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.input-group input,
.input-group select {
    background: #f8fafc;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    padding: 0.75rem;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    background: white;
}

.input-help {
    color: #64748b;
    font-size: 0.8rem;
    margin-top: 0.25rem;
    line-height: 1.3;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.toggle-advanced {
    background: none;
    border: none;
    color: var(--accent-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.toggle-advanced:hover {
    color: var(--primary-color);
}

.toggle-icon {
    transition: transform 0.3s ease;
}

.advanced-options {
    margin-top: 1.5rem;
}

.checkbox-group {
    margin-top: 2rem;
    display: grid;
    gap: 1rem;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: 8px;
    transition: background 0.3s ease;
}

.checkbox-item:hover {
    background: #f8fafc;
}

.checkbox-item input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #e2e8f0;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.checkbox-item input[type="checkbox"]:checked + .checkmark {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.checkbox-item input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    color: white;
    font-weight: bold;
    font-size: 0.8rem;
}

.calculate-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    transition: transform 0.3s ease;
}

.calculate-btn:hover {
    transform: translateY(-2px);
}

.btn-icon {
    font-size: 1.3rem;
}

.results-panel {
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    padding: 2rem;
    position: sticky;
    top: 2rem;
    height: fit-content;
}

.results-panel h3 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
    font-size: 1.4rem;
}

.key-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.metric-card {
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    border-top: 4px solid #e5e7eb;
}

.metric-card.primary {
    border-top-color: var(--primary-color);
    background: #f0f9ff;
}

.metric-card.success {
    border-top-color: #16a34a;
    background: #f0fdf4;
}

.metric-card.info {
    border-top-color: var(--accent-color);
    background: #e0f2fe;
}

.metric-card.warning {
    border-top-color: #f59e0b;
    background: #fffbeb;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: block;
    margin-bottom: 0.25rem;
}

.metric-label {
    color: #64748b;
    font-size: 0.8rem;
    line-height: 1.2;
}

.charts-container {
    margin: 2rem 0;
}

.chart-wrapper {
    margin-bottom: 2rem;
}

.chart-wrapper h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1rem;
    text-align: center;
}

.detailed-breakdown {
    margin: 2rem 0;
}

.detailed-breakdown h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.breakdown-tabs {
    display: flex;
    border-bottom: 2px solid #f1f5f9;
    margin-bottom: 1rem;
    overflow-x: auto;
}

.tab-btn {
    background: none;
    border: none;
    padding: 0.75rem 1rem;
    color: #64748b;
    cursor: pointer;
    font-weight: 500;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.tab-content {
    padding: 1rem 0;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid #f8fafc;
}

.breakdown-item:last-child {
    border-bottom: none;
}

.breakdown-item.highlight {
    background: #f0fdf4;
    padding: 0.75rem;
    border-radius: 6px;
    border: 1px solid #dcfce7;
    font-weight: 600;
    color: #16a34a;
}

.results-actions {
    display: grid;
    gap: 0.75rem;
    margin-top: 2rem;
}

.results-actions .btn {
    padding: 0.75rem 1rem;
    text-align: center;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: transform 0.3s ease;
    border: none;
    cursor: pointer;
}

.results-actions .btn:hover {
    transform: translateY(-1px);
}

.btn-accent {
    background: var(--accent-color);
    color: white;
}

.examples-section {
    margin-bottom: 4rem;
}

.examples-section h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.examples-intro {
    text-align: center;
    color: #64748b;
    max-width: 600px;
    margin: 0 auto 3rem;
    line-height: 1.6;
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.example-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.08);
    overflow: hidden;
    transition: transform 0.3s ease;
}

.example-card:hover {
    transform: translateY(-5px);
}

.example-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem;
    text-align: center;
}

.example-header h3 {
    margin-bottom: 0.5rem;
}

.example-type {
    background: rgba(255,255,255,0.2);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

.example-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-bottom: 1px solid #f1f5f9;
}

.example-stat {
    padding: 1.5rem;
    text-align: center;
    border-right: 1px solid #f1f5f9;
}

.example-stat:last-child {
    border-right: none;
}

.stat-value {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--primary-color);
    display: block;
    margin-bottom: 0.25rem;
}

.stat-label {
    color: #64748b;
    font-size: 0.8rem;
}

.example-details {
    padding: 2rem;
}

.example-details p {
    color: #4b5563;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
}

.example-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    margin: 0 2rem 2rem;
    transition: background 0.3s ease;
}

.example-btn:hover {
    background: #0369a1;
}

.calculator-cta {
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    padding: 4rem 3rem;
    border-radius: 16px;
    text-align: center;
}

.calculator-cta h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.calculator-cta p {
    color: #64748b;
    max-width: 700px;
    margin: 0 auto 2rem;
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .calculator-main {
        grid-template-columns: 1fr;
    }
    
    .project-types {
        grid-template-columns: 1fr;
    }
    
    .input-grid {
        grid-template-columns: 1fr;
    }
    
    .key-metrics {
        grid-template-columns: 1fr;
    }
    
    .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .example-stats {
        grid-template-columns: 1fr;
    }
    
    .example-stat {
        border-right: none;
        border-bottom: 1px solid #f1f5f9;
    }
    
    .example-stat:last-child {
        border-bottom: none;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .results-panel {
        position: static;
    }
}