* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #000;
    background-color: #fff;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    color: #000;
    margin-bottom: 15px;
    font-size: 2rem;
    line-height: 1.3;
}

header p {
    color: #666;
    font-size: 1.05rem;
    line-height: 1.5;
    max-width: 600px;
    margin: 0 auto;
}

.calculator-section {
    background: #fff;
    padding: 20px;
    border-radius: 0px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    margin-bottom: 20px;
    border: 1px solid #000;
}

.calculator-section h2 {
    color: #000;
    margin-bottom: 20px;
    font-size: 1.4rem;
}

/* Form Layout */
.form-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 20px;
}

.form-column {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-theme {
    background: #fafafa;
    padding: 15px;
    border-radius: 0px;
    border: 1px solid #eee;
}

.input-theme h4 {
    margin: 0 0 15px 0;
    font-size: 1rem;
    font-weight: 600;
    color: #333;
    border-bottom: 1px solid #ddd;
    padding-bottom: 8px;
}

.input-group {
    margin-bottom: 15px;
}

.input-group:last-child {
    margin-bottom: 0;
}

.input-hint {
    font-size: 0.8rem;
    color: #666;
    margin-top: 4px;
    font-style: italic;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #000;
}

input, select {
    width: 100%;
    padding: 12px;
    border: 1px solid #000;
    border-radius: 0px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background: #fff;
    color: #000;
}

input:focus, select:focus {
    outline: none;
    border-color: #000;
}

small {
    color: #666;
    font-size: 0.9rem;
    display: block;
    margin-top: 5px;
}

#calculate-btn {
    width: 100%;
    padding: 15px;
    background: #000;
    color: #fff;
    border: none;
    border-radius: 0px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 10px;
}

#calculate-btn:hover {
    background: #333;
}

.results-section {
    background: #fff;
    padding: 30px;
    border-radius: 0px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    border: 1px solid #000;
}

.heater-requirements-section {
    margin: 0 0 30px 0;
    padding: 20px;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 0px;
}

.heater-requirements-section h3 {
    margin: 0 0 15px 0;
    color: #000;
    font-size: 1.2rem;
    font-weight: 600;
}

.heater-requirements-display {
    text-align: center;
    margin-bottom: 0;
}

.primary-result {
    font-size: 3rem;
    font-weight: bold;
    color: #000;
    margin-bottom: 10px;
}

.result-breakdown {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.4;
}

.share-section {
    border-top: 1px solid #eee;
    padding-top: 20px;
    margin-bottom: 30px;
    text-align: center;
}

#share-btn {
    padding: 10px 20px;
    background: #000;
    color: #fff;
    border: none;
    border-radius: 0px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

#share-btn:hover {
    background: #333;
}

#share-url {
    width: 100%;
    margin-top: 10px;
    padding: 10px;
    background: #fff;
    border: 1px solid #000;
    border-radius: 0px;
    font-family: monospace;
    font-size: 0.9rem;
    color: #000;
}

.heaters-section {
    background: #fff;
    padding: 30px;
    border-radius: 0px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    border: 1px solid #000;
}

.heaters-section h3 {
    color: #000;
    margin-bottom: 20px;
}

.heaters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.heater-card {
    border: 1px solid #000;
    border-radius: 0px;
    padding: 20px;
    transition: border-color 0.3s ease;
    background: #fff;
}

.heater-card:hover {
    border-color: #000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.heater-card h4 {
    color: #000;
    margin-bottom: 10px;
}

.heater-card .brand {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.heater-card .power {
    color: #000;
    font-weight: bold;
    margin-bottom: 10px;
}

.heater-card .price {
    color: #000;
    font-weight: 600;
}

.info-section {
    background: #fff;
    padding: 30px;
    border-radius: 0px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    border: 1px solid #000;
}

.info-section h2 {
    color: #000;
    margin-bottom: 20px;
}

.info-content p {
    margin-bottom: 10px;
    color: #000;
}

.info-content strong {
    color: #000;
}

.info-icon {
    display: inline-block;
    margin-left: 5px;
    width: 16px;
    height: 16px;
    border: 1px solid #000;
    border-radius: 50%;
    text-align: center;
    line-height: 14px;
    font-size: 12px;
    cursor: pointer;
    background: #fff;
    color: #000;
    font-weight: bold;
}

.info-icon:hover {
    background: #000;
    color: #fff;
}

.info-box {
    background: #fff;
    border: 1px solid #000;
    padding: 10px;
    margin: 5px 0 10px 0;
    font-size: 0.9rem;
    color: #000;
}

.info-box p {
    margin: 0 0 8px 0;
    font-weight: 600;
}

.info-box ul {
    margin: 0;
    padding-left: 20px;
}

.info-box li {
    margin-bottom: 2px;
    color: #000;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.section-header h2 {
    margin: 0;
}

.unit-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
}

.unit-label {
    font-size: 0.9rem;
    color: #000;
    font-weight: 600;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #000;
    transition: .4s;
    border-radius: 0;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: #fff;
    transition: .4s;
    border-radius: 0;
}

input:checked + .slider {
    background-color: #000;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.visualization-section {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #000;
}

.visualization-section h3 {
    color: #000;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.blueprint-container {
    background: #fff;
    border: 1px solid #000;
    padding: 20px;
    text-align: center;
}

#sauna-blueprint {
    display: block;
    width: 100%;
    max-width: 600px;
    height: auto;
    font-family: 'Inter', sans-serif;
    margin: 0 auto;
}

#sauna-blueprint text {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
}

.uninsulated-area {
    fill: none;
    stroke: #000;
    stroke-width: 3;
    stroke-dasharray: 5,5;
}

/* Error Container Styles */
.error-container {
    display: none;
    background: #fff;
    border: 2px solid #e74c3c;
    border-radius: 0px;
    padding: 20px;
    margin-bottom: 20px;
    position: relative;
    box-shadow: 0 4px 8px rgba(231, 76, 60, 0.1);
}

.error-container .error-close {
    position: absolute;
    top: 10px;
    right: 15px;
    background: none;
    border: none;
    font-size: 20px;
    font-weight: bold;
    color: #e74c3c;
    cursor: pointer;
    padding: 0;
    width: 25px;
    height: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.error-container .error-close:hover {
    color: #c0392b;
    background: #f8f8f8;
    border-radius: 50%;
}

.error-item {
    color: #e74c3c;
    margin-bottom: 8px;
    font-weight: 600;
    display: flex;
    align-items: center;
}

.error-item:before {
    content: "⚠";
    margin-right: 8px;
    font-size: 16px;
}

.error-item:last-child {
    margin-bottom: 0;
}

/* Volume Information Styling */
.volume-info {
    background: #f8f9fa;
    padding: 15px;
    margin: 10px 0;
    border: 1px solid #dee2e6;
    border-radius: 0px;
}

.volume-info > div {
    margin-bottom: 8px;
}

.volume-info > div:last-child {
    margin-bottom: 0;
}

.volume-info strong {
    color: #000;
    font-weight: 600;
}

/* Enhanced Heater Card Styles */
.heater-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.market-availability {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.market-badge {
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 0px;
    font-weight: 600;
    text-transform: uppercase;
}

.market-badge.market-us {
    background: #fff;
    color: #000;
    border: 1px solid #000;
}

.market-badge.market-ca {
    background: #f5f5f5;
    color: #000;
    border: 1px solid #666;
}

.market-badge.market-eu {
    background: #000;
    color: #fff;
    border: 1px solid #000;
}

.effective-volume-range {
    background: #f5f5f5;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #000;
    border-radius: 0px;
    font-size: 1rem;
    font-weight: 600;
    color: #000;
    transition: background-color 0.2s ease;
}

.effective-volume-range:hover {
    background: #eee;
}

.power-secondary {
    font-size: 0.9rem;
    color: #666;
    margin: 6px 0;
    font-weight: normal;
}

.electrical-info {
    background: #fff;
    padding: 8px;
    margin: 8px 0;
    border: 1px solid #666;
    border-radius: 0px;
    font-size: 0.9rem;
    color: #000;
}

.features {
    margin: 10px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.feature-tag {
    font-size: 0.8rem;
    padding: 2px 6px;
    background: #fff;
    border: 1px solid #000;
    border-radius: 0px;
    color: #000;
    transition: all 0.2s ease;
}

.feature-tag:hover {
    background: #f5f5f5;
}

.purchase-links {
    margin-top: 15px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.purchase-link {
    display: inline-block;
    padding: 6px 12px;
    font-size: 0.85rem;
    text-decoration: none;
    border: 1px solid;
    border-radius: 0px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.purchase-link.official {
    background: #000;
    color: #fff;
    border-color: #000;
}

.purchase-link.official:hover {
    background: #333;
}

.purchase-link.retailer {
    background: #fff;
    color: #000;
    border-color: #000;
}

.purchase-link.retailer:hover {
    background: #000;
    color: #fff;
}

/* Compact Heater Cards */
.heater-card.compact {
    border: 1px solid #ddd;
    border-radius: 0px;
    background: #fff;
    overflow: hidden;
    transition: box-shadow 0.2s ease;
}

.heater-card.compact:hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.card-main {
    display: grid;
    grid-template-columns: 70px 1fr;
    grid-template-rows: auto auto;
    align-items: start;
    padding: 15px 15px 0 15px;
    gap: 15px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.card-main:hover {
    background-color: #f8f8f8;
}

/* Cards without placement data */
.heater-card.no-placement .card-main {
    cursor: not-allowed;
    opacity: 0.7;
}

.heater-card.no-placement .card-main:hover {
    background-color: #fff3cd;
}

.heater-image {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8f8f8;
    border: 1px solid #eee;
    border-radius: 0px;
    padding: 6px;
    grid-column: 1;
    grid-row: 1;
}

.heater-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.heater-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #f8f8f8;
    border: 1px solid #ddd;
    color: #666;
}

.placeholder-icon {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: #000;
}

.placeholder-text {
    font-size: 0.7rem;
    font-weight: 500;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-info {
    grid-column: 2;
    grid-row: 1;
    min-width: 0;
}

.heater-title {
    margin-bottom: 8px;
}

.heater-title .brand {
    font-size: 0.85rem;
    color: #666;
    font-weight: 500;
    display: block;
    line-height: 1.2;
}

.heater-title .model {
    font-size: 1.1rem;
    font-weight: 600;
    color: #000;
    margin: 2px 0 0 0;
    line-height: 1.3;
}

.power-display {
    font-size: 1rem;
    font-weight: 600;
    color: #000;
    margin-bottom: 6px;
}

.effective-volume-range {
    font-size: 0.85rem;
    color: #555;
    margin: 6px 0;
    line-height: 1.4;
}

.effective-volume-range strong {
    display: inline;
    font-weight: 600;
    color: #000;
    margin-right: 4px;
}

.price-compact {
    font-size: 0.9rem;
    color: #666;
    margin-top: 6px;
    font-weight: 500;
}

.details-toggle {
    background: none;
    border: none;
    border-top: 1px solid #eee;
    border-radius: 0px;
    padding: 12px 15px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 0.85rem;
    color: #666;
    transition: all 0.2s ease;
    grid-column: 1 / -1;
    grid-row: 2;
    white-space: nowrap;
    margin: 8px -15px 0 -15px;
}

.details-toggle:hover {
    background: #f5f5f5;
    color: #000;
}

.toggle-icon {
    font-size: 0.7rem;
    transition: transform 0.2s ease;
}

.card-details {
    border-top: 1px solid #eee;
    background: #fafafa;
}

.detail-section {
    padding: 15px;
}

.market-badges {
    margin-bottom: 10px;
}

.mounting-info {
    margin: 10px 0;
    font-size: 0.9rem;
    color: #555;
}

.features-compact {
    margin: 10px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.features-compact .feature-tag {
    font-size: 0.75rem;
    padding: 2px 6px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 0px;
    color: #666;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .card-main {
        grid-template-columns: 60px 1fr;
        grid-template-rows: auto auto;
        gap: 12px;
        padding: 12px 12px 0 12px;
    }
    
    .heater-image {
        width: 60px;
        height: 60px;
        grid-column: 1;
        grid-row: 1;
        align-self: start;
    }
    
    .card-info {
        grid-column: 2;
        grid-row: 1;
    }
    
    .details-toggle {
        grid-column: 1 / -1;
        grid-row: 2;
        margin: 8px -12px 0 -12px;
        padding: 10px 12px;
    }
}

@media (max-width: 400px) {
    .card-main {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        text-align: center;
        gap: 10px;
        padding: 10px 10px 0 10px;
    }
    
    .heater-image {
        grid-column: 1;
        grid-row: 1;
        justify-self: center;
        width: 55px;
        height: 55px;
    }
    
    .card-info {
        grid-column: 1;
        grid-row: 2;
    }
    
    .details-toggle {
        grid-column: 1;
        grid-row: 3;
        margin: 6px -10px 0 -10px;
        padding: 8px 10px;
    }
}

/* Legacy Heater Images (for non-compact cards) */
.heater-card:not(.compact) .heater-image {
    margin: 15px 0 10px;
    text-align: center;
    background: #fafafa;
    padding: 20px;
    border: 1px solid #eee;
    border-radius: 0px;
}

.heater-card:not(.compact) .heater-placeholder {
    width: 100%;
    height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #f8f8f8;
    border: 1px solid #ddd;
    color: #666;
}

.heater-card:not(.compact) .placeholder-icon {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #000;
}

.heater-card:not(.compact) .placeholder-text {
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Calculation Toggle Styles */
.calculation-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding: 8px 0;
    margin-bottom: 10px;
    user-select: none;
    transition: color 0.2s ease;
}

.calculation-toggle:hover {
    color: #333;
}

.calculation-toggle h4 {
    margin: 0;
    font-size: 1rem;
    color: #666;
    font-weight: 600;
}

.calculation-toggle .toggle-icon {
    font-size: 0.8rem;
    color: #666;
    transition: transform 0.2s ease;
    margin-left: 10px;
}

.calculation-details {
    margin-bottom: 15px;
}

/* Heater Requirements Display */
.heater-primary {
    font-size: 1.1rem;
    margin-bottom: 15px;
    padding: 10px;
    background: #f5f5f5;
    border: 1px solid #ccc;
    border-left: 4px solid #000;
    color: #000;
}

.heater-secondary {
    font-size: 0.95rem;
    color: #666;
    margin-top: 6px;
    font-weight: normal;
    line-height: 1.4;
}

.heater-breakdown {
    margin-bottom: 15px;
}

.heater-breakdown h4 {
    margin: 0 0 10px 0;
    font-size: 1rem;
    color: #666;
    font-weight: 600;
}

.heater-standards {
    display: grid;
    gap: 8px;
    margin-bottom: 15px;
}

.heater-calculation {
    background: #f5f5f5;
    padding: 12px;
    border-radius: 0px;
    margin-top: 10px;
    border-left: 3px solid #666;
}

.heater-details {
    border-top: 1px solid #eee;
    padding-top: 15px;
}

.heater-note {
    font-size: 0.9rem;
    color: #666;
    font-style: italic;
    line-height: 1.4;
}

/* Ventilation Section */
.ventilation-section {
    margin: 30px 0;
    padding: 20px;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 0px;
}

.ventilation-section h3 {
    margin: 0 0 15px 0;
    color: #000;
    font-size: 1.2rem;
    font-weight: 600;
}

.ventilation-primary {
    font-size: 1.1rem;
    margin-bottom: 15px;
    padding: 10px;
    background: #f5f5f5;
    border: 1px solid #ccc;
    border-left: 4px solid #000;
    color: #000;
}

.mechanical-emphasis {
    background: #f5f5f5;
    border: 1px solid #ccc;
    border-left: 4px solid #000;
    padding: 12px;
    margin-bottom: 15px;
    border-radius: 0px;
}

.mechanical-emphasis strong {
    color: #000;
    font-weight: 600;
}

.mechanical-reason {
    font-size: 0.95rem;
    color: #666;
    margin-top: 6px;
    font-weight: normal;
    line-height: 1.4;
}

.ventilation-recommendation {
    background: #fafafa;
    border: 1px solid #ddd;
    border-left: 4px solid #666;
    padding: 12px;
    margin-bottom: 15px;
    border-radius: 0px;
    color: #666;
    line-height: 1.4;
}

.ventilation-breakdown {
    margin-bottom: 15px;
}

.ventilation-breakdown h4 {
    margin: 0 0 10px 0;
    font-size: 1rem;
    color: #666;
    font-weight: 600;
}

.range-calculation {
    background: #f5f5f5;
    padding: 12px;
    border-radius: 0px;
    margin-top: 10px;
    border-left: 3px solid #666;
}

.range-detail {
    margin-bottom: 8px;
    font-size: 0.95rem;
    line-height: 1.4;
}

.range-detail:last-child {
    margin-bottom: 0;
}

.ventilation-standards {
    display: grid;
    gap: 8px;
    margin-bottom: 15px;
}

.standard-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 0px;
}

.standard-name {
    font-weight: 500;
    color: #666;
}

.standard-value {
    font-weight: 600;
    color: #000;
}

.user-count {
    font-size: 0.9rem;
    color: #666;
    margin-left: 8px;
}

.ventilation-details {
    border-top: 1px solid #eee;
    padding-top: 15px;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 0.95rem;
    color: #666;
}

.ventilation-note {
    font-size: 0.9rem;
    color: #666;
    font-style: italic;
    line-height: 1.4;
}

@media (max-width: 600px) {
    .detail-row {
        flex-direction: column;
        gap: 4px;
    }
    
    .standard-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}

/* Sauna Blueprint Visualization */
.visualization-section {
    margin: 0;
    padding: 0;
    background: #f5f5f5;
    border: none;
    border-radius: 0px;
    text-align: center;
    width: 100%;
}

.blueprint-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
    background: #f5f5f5;
    border: none;
    border-radius: 0px;
    overflow: visible;
    padding: 30px 20px;
    margin: 0 auto;
    width: 100%;
    text-align: center;
}

.sauna-blueprint {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

.purchase-link.info {
    background: #fff;
    color: #666;
    border-color: #666;
}

.purchase-link.info:hover {
    background: #666;
    color: #fff;
}

/* Regional Filter Styles */
.regional-filter {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-label {
    font-size: 0.9rem;
    color: #000;
    font-weight: 600;
    margin-bottom: 0;
}

.region-select {
    padding: 8px 12px;
    border: 1px solid #000;
    border-radius: 0px;
    font-size: 0.9rem;
    background: #fff;
    color: #000;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.region-select:focus {
    outline: none;
    border-color: #333;
}

.region-select:hover {
    border-color: #333;
}

/* FAQ Section Styles */
.faq-section {
    background: #fff;
    padding: 40px 20px;
    margin-top: 40px;
    border: 1px solid #000;
    border-radius: 0px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.faq-toggle {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 15px;
    border-bottom: 1px solid #eee;
    transition: background-color 0.2s ease;
}

.faq-toggle:hover {
    background: #f9f9f9;
}

.faq-toggle h2 {
    color: #000;
    font-size: 1.3rem;
    margin: 0;
}

.faq-arrow {
    color: #666;
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.faq-content {
    padding-top: 20px;
}

.faq-item {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid #f0f0f0;
}

.faq-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.faq-item h3 {
    color: #000;
    font-size: 1.1rem;
    margin-bottom: 10px;
    font-weight: 600;
    line-height: 1.4;
}

.faq-item p {
    color: #333;
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

/* Footer Styles */
footer {
    background: #000;
    color: #fff;
    margin-top: 50px;
    padding: 40px 0 20px 0;
    border-top: 1px solid #000;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}

.footer-section p {
    color: #ccc;
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

.footer-bottom {
    max-width: 800px;
    margin: 30px auto 0 auto;
    padding: 20px 20px 0 20px;
    border-top: 1px solid #333;
    text-align: center;
}

.footer-bottom p {
    color: #999;
    font-size: 0.85rem;
    margin-bottom: 8px;
    line-height: 1.4;
}

.footer-bottom p:last-child {
    margin-bottom: 0;
}

@media (max-width: 600px) {
    .container {
        padding: 15px;
    }
    
    /* Form responsive */
    .form-columns {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .form-column {
        gap: 15px;
    }
    
    .input-theme {
        padding: 12px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 25px;
        text-align: center;
    }
    
    footer {
        margin-top: 30px;
        padding: 30px 0 15px 0;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .calculator-section,
    .results-section,
    .info-section {
        padding: 20px;
    }
    
    .primary-result {
        font-size: 2.5rem;
    }
    
    .heaters-grid {
        grid-template-columns: 1fr;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .unit-toggle {
        align-self: flex-end;
    }
    
    .regional-filter {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        width: 100%;
    }
    
    .region-select {
        width: 100%;
    }
    
    .heater-header {
        flex-direction: column;
        gap: 8px;
    }
    
    .purchase-links {
        flex-direction: column;
    }
    
    .purchase-link {
        text-align: center;
    }
}

/* Löyly Modal Styles */
.sr-louly-trigger {
    cursor: pointer;
    text-decoration: underline;
    text-decoration-style: dotted;
    text-underline-offset: 3px;
    transition: all 0.2s ease;
    color: inherit;
}

.sr-louly-trigger:hover {
    background: rgba(0, 0, 0, 0.05);
    padding: 2px 4px;
    margin: -2px -4px;
    border-radius: 2px;
}

.sr-louly-trigger:focus {
    outline: 2px solid #000;
    outline-offset: 2px;
    background: rgba(0, 0, 0, 0.05);
    padding: 2px 4px;
    margin: -2px -4px;
    border-radius: 2px;
}

.sr-louly-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
}

.sr-louly-modal.sr-louly-show {
    display: flex;
}

.sr-louly-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    cursor: pointer;
}

.sr-louly-content {
    position: relative;
    background: #fff;
    border: 2px solid #000;
    border-radius: 0px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    opacity: 0;
    transition: all 0.2s ease;
}

.sr-louly-modal.sr-louly-show .sr-louly-content {
    transform: scale(1);
    opacity: 1;
}

.sr-louly-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px 15px;
    border-bottom: 1px solid #eee;
}

.sr-louly-header h3 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: #000;
}

.sr-louly-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    transition: color 0.2s ease;
}

.sr-louly-close:hover,
.sr-louly-close:focus {
    color: #000;
    outline: 2px solid #000;
    outline-offset: 2px;
}

.sr-louly-body {
    padding: 20px 25px 25px;
}

.sr-louly-body p {
    margin: 0;
    line-height: 1.6;
    color: #333;
    font-size: 1rem;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .sr-louly-trigger:hover,
    .sr-louly-trigger:focus {
        background: rgba(255, 255, 255, 0.1);
    }
    
    .sr-louly-trigger:focus {
        outline-color: #fff;
    }
    
    .sr-louly-overlay {
        background: rgba(0, 0, 0, 0.7);
    }
    
    .sr-louly-content {
        background: #222;
        border-color: #666;
        color: #fff;
    }
    
    .sr-louly-header {
        border-bottom-color: #444;
    }
    
    .sr-louly-header h3 {
        color: #fff;
    }
    
    .sr-louly-close {
        color: #ccc;
    }
    
    .sr-louly-close:hover,
    .sr-louly-close:focus {
        color: #fff;
        outline-color: #fff;
    }
    
    .sr-louly-body p {
        color: #ddd;
    }
    
    /* Heater images dark mode */
    .heater-image {
        background: #333;
        border-color: #555;
    }
}

/* Mobile responsive */
@media (max-width: 600px) {
    .sr-louly-content {
        width: 95%;
        margin: 10px;
    }
    
    .sr-louly-header,
    .sr-louly-body {
        padding-left: 20px;
        padding-right: 20px;
    }
}