.fastener-designer {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--light-color, #f4f6f8) 0%, #ffffff 100%);
}

.designer-wrapper {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 32px;
    margin-top: 40px;
}

.designer-viewer {
    position: relative;
    background: linear-gradient(135deg, #1a2a3a 0%, #0f1f2e 50%, #0a1520 100%);
    border-radius: 12px;
    overflow: hidden;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg, 0 12px 32px rgba(0, 0, 0, 0.12));
    border: 1px solid rgba(0, 222, 234, 0.1);
}

#three-container {
    width: 100%;
    height: 500px;
}

.viewer-controls {
    position: absolute;
    top: 16px;
    right: 16px;
    display: flex;
    gap: 8px;
}

.viewer-btn {
    width: 36px;
    height: 36px;
    background: rgba(0, 222, 234, 0.1);
    border: 1px solid rgba(0, 222, 234, 0.3);
    border-radius: 6px;
    color: var(--primary-color, #00DEEA);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast, 0.2s);
}

.viewer-btn:hover {
    background: rgba(0, 222, 234, 0.2);
    border-color: var(--primary-color, #00DEEA);
    box-shadow: 0 0 12px rgba(0, 222, 234, 0.3);
}

.viewer-btn.active {
    background: var(--primary-color, #00DEEA);
    border-color: var(--primary-color, #00DEEA);
    color: var(--dark-color, #151c24);
}

.viewer-info {
    position: absolute;
    bottom: 16px;
    left: 16px;
    background: rgba(21, 28, 36, 0.85);
    padding: 10px 20px;
    border-radius: 6px;
    border: 1px solid rgba(0, 222, 234, 0.25);
    backdrop-filter: blur(8px);
}

#dimension-labels {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

#model-type-display {
    color: var(--primary-color, #00DEEA);
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.designer-controls {
    background: #fff;
    border: 1px solid var(--border-color, #d1d9e0);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-md, 0 4px 12px rgba(0, 0, 0, 0.1));
}

.control-header {
    margin-bottom: 24px;
}

.model-toggle {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
}

.toggle-btn {
    flex: 1;
    padding: 10px 16px;
    background: var(--light-color, #f4f6f8);
    border: 2px solid var(--border-color, #d1d9e0);
    border-radius: 6px;
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-fast, 0.2s);
    color: var(--gray-color, #5a6572);
}

.toggle-btn.active {
    background: var(--primary-color, #00DEEA);
    border-color: var(--primary-color, #00DEEA);
    color: var(--dark-color, #151c24);
}

.toggle-btn:hover:not(.active) {
    border-color: var(--primary-color, #00DEEA);
    color: var(--dark-color, #151c24);
}

.unit-toggle {
    display: flex;
    gap: 4px;
}

.unit-btn {
    flex: 1;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--border-color, #d1d9e0);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast, 0.2s);
    color: var(--gray-color, #5a6572);
}

.unit-btn.active {
    background: var(--primary-color, #00DEEA);
    border-color: var(--primary-color, #00DEEA);
    color: var(--dark-color, #151c24);
}

.unit-btn:hover:not(.active) {
    border-color: var(--primary-color, #00DEEA);
    color: var(--primary-color, #00DEEA);
}

.control-panel h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-color, #151c24);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color, #d1d9e0);
}

.control-group {
    margin-bottom: 16px;
}

.control-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--dark-color, #151c24);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.input-row input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--light-secondary, #e8ecf0);
    border-radius: 3px;
    cursor: pointer;
}

.input-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color, #00DEEA);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-sm, 0 2px 4px rgba(0,0,0,0.06));
    transition: transform var(--transition-fast, 0.2s);
}

.input-row input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 0 8px rgba(0, 222, 234, 0.4);
}

.input-row select {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border-color, #d1d9e0);
    border-radius: 6px;
    font-size: 14px;
    background: #fff;
    cursor: pointer;
    transition: border-color var(--transition-fast, 0.2s);
    color: var(--dark-color, #151c24);
}

.input-row select:focus {
    outline: none;
    border-color: var(--primary-color, #00DEEA);
    box-shadow: 0 0 0 3px rgba(0, 222, 234, 0.15);
}

.value-display {
    min-width: 60px;
    padding: 6px 12px;
    background: var(--light-color, #f4f6f8);
    border-radius: 4px;
    font-size: 13px;
    font-weight: 600;
    color: var(--dark-color, #151c24);
    text-align: center;
    font-family: 'Outfit', sans-serif;
    border: 1px solid var(--border-color, #d1d9e0);
}

.color-options {
    display: flex;
    gap: 8px;
}

.color-btn {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border-color, #d1d9e0);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast, 0.2s);
}

.color-btn.active {
    border-color: var(--primary-color, #00DEEA);
    box-shadow: 0 0 0 3px rgba(0, 222, 234, 0.3);
}

.color-btn:hover:not(.active) {
    transform: scale(1.1);
    border-color: var(--primary-color, #00DEEA);
}

.designer-output {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color, #d1d9e0);
}

.output-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--gray-color, #5a6572);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.spec-text {
    font-family: 'Outfit', sans-serif;
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-color, #151c24);
    padding: 12px 16px;
    background: var(--light-color, #f4f6f8);
    border-radius: 6px;
    border: 1px solid var(--border-color, #d1d9e0);
}

@media (max-width: 992px) {
    .designer-wrapper {
        grid-template-columns: 1fr;
    }
    
    #three-container {
        height: 400px;
    }
}

@media (max-width: 480px) {
    .model-toggle {
        flex-direction: column;
    }
    
    .unit-toggle {
        flex-direction: column;
    }
}