:root {
    --bg-color: #1a1a2e;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --text-color: #ffffff;
    --text-muted: #a0a0a0;
    --primary-color: #00d2ff;
    --primary-hover: #3a7bd5;
    --danger-color: #ff4b4b;
    --success-color: #00b894;
}

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

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    position: relative;
    width: 100vw;
    height: 100vh;
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: radial-gradient(circle at center, #2a2a4e 0%, #1a1a2e 100%);
}

/* Glassmorphism Panels */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Sidebar */
.sidebar {
    position: absolute;
    top: 20px;
    left: 20px;
    bottom: 20px;
    width: 320px;
    border-radius: 16px;
    padding: 25px;
    z-index: 10;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    overflow: hidden; /* Prevent sidebar itself from scrolling */
}

.sidebar-scroll-area {
    flex: 1;
    overflow-y: auto;
    min-height: 0; /* Firefox fix */
    margin-bottom: 10px;
    padding-right: 5px; /* Space for scrollbar */
}

/* Custom scrollbar for sidebar */
.sidebar-scroll-area::-webkit-scrollbar { width: 4px; }
.sidebar-scroll-area::-webkit-scrollbar-track { background: rgba(255,255,255,0.05); }
.sidebar-scroll-area::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 2px; }

.logo h1 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: #fff;
    font-weight: 800;
    letter-spacing: 1px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    flex-shrink: 0;
}

.controls-section {
    margin-bottom: 20px;
    flex-shrink: 0;
}

.controls-section.scrollable {
    flex: 1;
    min-height: 0; /* Crucial for flex scrolling */
    display: flex;
    flex-direction: column;
    margin-bottom: 20px;
}

.controls-section h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 10px;
    font-weight: 600;
    letter-spacing: 1px;
    flex-shrink: 0;
}

/* Color Palette */
.color-palette {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.color-swatch {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid rgba(255,255,255,0.1);
    transition: transform 0.2s, border-color 0.2s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.color-swatch:hover {
    transform: scale(1.1);
    border-color: rgba(255,255,255,0.5);
}

.color-swatch.active {
    border-color: #fff;
    box-shadow: 0 0 0 2px var(--primary-color);
    transform: scale(1.1);
}

/* Dynamic Island Menu */
.dynamic-menu {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: 30px;
    padding: 10px 20px;
    z-index: 100;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    width: 160px;
    height: 50px;
    overflow: hidden;
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.dynamic-menu.expanded {
    width: 600px;
    height: 500px;
    border-radius: 20px;
    background: rgba(20, 20, 30, 0.95);
}

.menu-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    height: 30px;
    white-space: nowrap;
    color: #fff;
    font-weight: 600;
    pointer-events: none; /* Let clicks pass through to container */
    transition: opacity 0.2s;
}

/* Hide header text when expanded to make room? Or keep it? 
   Let's keep it but maybe move it or style it. 
   For now, standard behavior. */

.menu-icon {
    font-size: 1.2rem;
}

.menu-content {
    opacity: 0;
    transition: opacity 0.2s ease;
    margin-top: 20px;
    height: calc(100% - 50px);
    overflow: hidden;
    pointer-events: none;
}

.dynamic-menu.expanded .menu-content {
    opacity: 1;
    pointer-events: auto;
    transition-delay: 0.2s;
}

/* Piece Library (New 3D Grid) */
.piece-library-grid {
    overflow-y: auto;
    padding-right: 5px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    height: 100%;
}

/* Scrollbar styling */
.piece-library-grid::-webkit-scrollbar {
    width: 6px;
}
.piece-library-grid::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.05);
    border-radius: 3px;
}
.piece-library-grid::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: 3px;
}

.piece-group h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 15px;
    padding-left: 10px;
    border-left: 3px solid var(--primary-color);
    letter-spacing: 1px;
}

.piece-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 15px;
    padding: 0 10px;
}

.piece-item-3d {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    padding: 10px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    aspect-ratio: 1;
    position: relative;
    overflow: hidden;
}

.piece-item-3d:hover {
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,255,255,0.3);
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

.piece-item-3d.active {
    background: rgba(0, 210, 255, 0.15);
    border-color: var(--primary-color);
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.3);
}

.piece-item-3d img {
    width: 100%;
    height: 80%;
    object-fit: contain;
    filter: drop-shadow(0 5px 10px rgba(0,0,0,0.5));
    transition: transform 0.3s;
}

.piece-item-3d:hover img {
    transform: scale(1.2) rotate(5deg);
}

.piece-item-3d span {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(0,0,0,0.8);
    font-size: 0.7rem;
    text-align: center;
    padding: 4px 0;
    opacity: 0;
    transform: translateY(100%);
    transition: all 0.3s;
    pointer-events: none;
}

.piece-item-3d:hover span {
    opacity: 1;
    transform: translateY(0);
}

.premium-badge {
    position: absolute;
    top: 5px;
    right: 5px;
    background: linear-gradient(45deg, #FFD700, #FFA500);
    color: #000;
    font-size: 0.7rem;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    z-index: 2;
}

.piece-item-3d.locked {
    opacity: 0.7;
    filter: grayscale(0.5);
}

.piece-item-3d.locked:hover {
    filter: grayscale(0);
}

/* Buttons */
.btn {
    display: block;
    width: 100%;
    padding: 12px;
    margin-bottom: 10px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

.btn-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 12px;
}

.btn-group .btn {
    margin-bottom: 0;
}

#stl-preview-container {
    width: 100%;
    height: 200px;
    background: #000;
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
    position: relative;
    border: 1px solid rgba(255,255,255,0.1);
}

.footer-controls {
    margin-top: auto;
    flex-shrink: 0;
    margin-bottom: 0;
}

/* Toolbar */
.toolbar {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 12px 25px;
    border-radius: 30px;
    z-index: 10;
    display: flex;
    gap: 20px;
    align-items: center;
    color: #fff;
}

.tool-info {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.3s;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    width: 800px;
    max-width: 90%;
    height: 80vh;
    border-radius: 20px;
    padding: 30px;
    display: flex;
    flex-direction: column;
    background: #252540; /* Solid fallback or darker glass */
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 15px;
}

.close-btn {
    background: none;
    border: none;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
}

.gallery-actions {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.input-field {
    flex: 1;
    background: rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 8px;
    padding: 0 15px;
    color: white;
    font-size: 1rem;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-color);
}

.gallery-grid {
    flex: 1;
    overflow-y: auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    padding: 5px;
}

.gallery-item {
    background: rgba(255,255,255,0.05);
    border-radius: 12px;
    padding: 15px;
    transition: transform 0.2s;
    cursor: pointer;
    border: 1px solid transparent;
}

.gallery-item:hover {
    transform: translateY(-5px);
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.2);
}

.gallery-item h4 {
    margin-bottom: 5px;
    color: #fff;
}

.gallery-item p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.loading-spinner {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.btn-tool {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-muted);
    margin-bottom: 0;
    display: flex;
    flex-direction: column; /* Stack icon and text for better fit */
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 15px 5px;
    height: 100%;
    font-size: 0.8rem;
}

.btn-tool:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
    transform: translateY(-2px);
}

.btn-tool.active {
    background: rgba(0, 210, 255, 0.15);
    border-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.15);
}

/* Atmosphere Controls */
.atmosphere-controls {
    background: rgba(0, 0, 0, 0.2);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.control-group label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
    margin: 5px 0;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 210, 255, 0.5);
    transition: transform 0.1s;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.time-labels {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    padding: 0 5px;
}

/* Icon Button */
.btn-icon {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: #fff;
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: rgba(255,255,255,0.2);
    transform: scale(1.05);
}

/* Gallery Thumbnails */
.gallery-thumbnail {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 10px;
    background: #000;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    background: rgba(30, 30, 40, 0.95);
    backdrop-filter: blur(10px);
    color: #fff;
    padding: 12px 25px;
    border-radius: 50px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    animation: toastSlideUp 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    pointer-events: auto;
    border: 1px solid rgba(255,255,255,0.1);
}

.toast.success { border-color: var(--success-color); }
.toast.error { border-color: var(--danger-color); }
.toast.info { border-color: var(--primary-color); }

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

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

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease;
}

.loading-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loader-content {
    text-align: center;
}

.loader-content h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #fff;
}

.loader-content h1 span {
    color: var(--primary-color);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255,255,255,0.1);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Help Modal Styles */
.help-content {
    max-width: 600px;
    height: auto;
    max-height: 80vh;
}

.help-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.help-item {
    background: rgba(255,255,255,0.05);
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.1);
}

.help-item p {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.key {
    display: inline-block;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 5px;
    padding: 5px 10px;
    font-family: monospace;
    font-weight: bold;
    margin: 0 2px;
    box-shadow: 0 2px 0 rgba(0,0,0,0.5);
}

.mouse-icon {
    font-size: 1.2rem;
}

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

.hidden {
    display: none !important;
}