body {
    font-family: "Segoe UI", Tahoma, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f0f4f8;
    color: #2d3748;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    background: white;
    min-height: 100vh;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
    position: relative;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.header h1 {
    margin: 0 0 10px 0;
    font-size: 2.5rem;
    font-weight: 700;
}

.header p {
    margin: 0;
    font-size: 1.1rem;
    opacity: 0.9;
}

.back-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.content {
    padding: 30px;
}

.section {
    background: white;
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e2e8f0;
}

.section-header h2 {
    margin: 0;
    color: #2d3748;
    font-size: 1.8rem;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #e2e8f0;
    color: #4a5568;
}

.btn-secondary:hover {
    background: #cbd5e0;
}

.btn-danger {
    background: #fc8181;
    color: white;
}

.btn-danger:hover {
    background: #f56565;
}

.btn-success {
    background: #48bb78;
    color: white;
}

.btn-success:hover {
    background: #38a169;
}

.colors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
}

.color-item {
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.color-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.color-item.hidden {
    opacity: 0.5;
}

.color-preview {
    width: 100%;
    height: 80px;
    border-radius: 6px;
    margin-bottom: 10px;
    border: 2px solid #cbd5e0;
}

.color-hex {
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.color-actions {
    display: flex;
    gap: 5px;
    justify-content: center;
    margin-top: 10px;
}

.color-actions .btn {
    min-width: 36px;
    min-height: 36px;
    padding: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.color-actions .btn i {
    font-size: 14px;
}

.color-actions .btn-primary i {
    color: #ff8c00; /* Orange pencil icon on purple button */
}

.texture-group-actions .btn i {
    margin-left: 5px;
}

.texture-group-actions .btn-success i {
    color: #ff8c00; /* Orange pencil icon on green button */
}

.texture-actions .btn {
    min-width: 36px;
    min-height: 36px;
    padding: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.texture-actions .btn i {
    font-size: 14px;
}

.texture-group {
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.texture-group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e2e8f0;
}

.texture-group-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2d3748;
}

.texture-group-image {
    width: 80px;
    height: 80px;
    border-radius: 6px;
    object-fit: cover;
    margin-left: 15px;
}

.texture-group-actions {
    display: flex;
    gap: 10px;
}

.textures-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.texture-item {
    background: #f7fafc;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.texture-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.texture-item.hidden {
    opacity: 0.5;
}

.texture-preview {
    width: 100%;
    height: 100px;
    border-radius: 6px;
    margin-bottom: 10px;
    object-fit: cover;
    border: 2px solid #cbd5e0;
}

.texture-name {
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    overflow: auto;
}

.modal-content {
    background: white;
    margin: 50px auto;
    padding: 0;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.modal-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 12px 12px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.modal-body {
    padding: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2d3748;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="color"],
.form-group input[type="file"] {
    width: 100%;
    padding: 10px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    box-sizing: border-box;
}

.form-group input[type="checkbox"] {
    margin-left: 10px;
    width: 20px;
    height: 20px;
}

.image-preview {
    max-width: 200px;
    max-height: 200px;
    margin-top: 10px;
    border-radius: 8px;
    border: 2px solid #e2e8f0;
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 30px;
}

.error {
    background: #fed7d7;
    color: #c53030;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.success {
    background: #c6f6d5;
    color: #22543d;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}