:root {
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-tertiary: #1e293b;
    --accent: #06b6d4;
    --accent-hover: #22d3ee;
    --accent-glow: rgba(6, 182, 212, 0.3);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --q1: #ef4444;
    --q2: #3b82f6;
    --q3: #22c55e;
    --q4: #f97316;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated background */
.bg-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(6, 182, 212, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 40% 80%, rgba(16, 185, 129, 0.05) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 3rem;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--text-primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 300;
}

/* Main layout */
.main-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
    align-items: start;
    transition: grid-template-columns 0.3s ease;
}

.main-grid.sidebar-collapsed {
    grid-template-columns: 1fr 56px;
}

@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    .main-grid.sidebar-collapsed {
        grid-template-columns: 1fr;
    }
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-body {
    padding: 1.5rem;
}

/* Upload zone */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-tertiary);
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--accent);
    background: rgba(6, 182, 212, 0.05);
}

.upload-zone.dragover {
    transform: scale(1.01);
}

.upload-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    opacity: 0.6;
}

.upload-text {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--text-muted);
}

#file-input {
    display: none;
}

/* Sample images */
.sample-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.sample-title {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-align: center;
}

.sample-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.sample-thumb {
    position: relative;
    aspect-ratio: 1;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
}

.sample-thumb:hover {
    border-color: var(--accent);
    transform: scale(1.02);
}

.sample-thumb.selected {
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

.sample-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.sample-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.25rem;
    background: rgba(0, 0, 0, 0.7);
    font-size: 0.7rem;
    text-align: center;
    color: var(--text-secondary);
}

/* Image viewer */
.viewer-container {
    position: relative;
    width: 100%;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: 12px;
    overflow: hidden;
}

.viewer-wrapper {
    position: relative;
    display: inline-block;
    transform-origin: center center;
    cursor: grab;
}

.viewer-wrapper.dragging {
    cursor: grabbing;
}

#main-image {
    display: block;
    max-width: none;
    user-select: none;
    -webkit-user-drag: none;
}

#overlay-canvas {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
}

/* Tooth tooltip */
.tooth-tooltip {
    position: absolute;
    background: rgba(17, 24, 39, 0.95);
    border: 1px solid var(--accent);
    border-radius: 6px;
    padding: 0.375rem 0.625rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    pointer-events: none;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.15s ease, transform 0.15s ease;
    z-index: 100;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.tooth-tooltip.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Zoom controls */
.zoom-controls {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(17, 24, 39, 0.9);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    z-index: 10;
}

.zoom-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.2s;
}

.zoom-btn:hover {
    background: var(--border);
    border-color: var(--accent);
}

.zoom-level {
    font-size: 0.8rem;
    color: var(--text-secondary);
    min-width: 50px;
    text-align: center;
}

.zoom-reset {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
}

.placeholder {
    text-align: center;
    color: var(--text-muted);
    padding: 4rem;
}

.placeholder-icon {
    font-size: 4rem;
    opacity: 0.3;
    margin-bottom: 1rem;
}

/* Controls sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    position: relative;
    transition: all 0.3s ease;
}

/* Sidebar toggle button */
.sidebar-toggle {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    align-self: flex-start;
}

.sidebar.collapsed .sidebar-toggle {
    align-self: center;
}

.sidebar-toggle:hover {
    background: var(--border);
    color: var(--accent);
    border-color: var(--accent);
}

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

.sidebar.collapsed .sidebar-toggle svg {
    transform: rotate(180deg);
}

/* Collapsed sidebar state */
.sidebar.collapsed {
    width: 56px;
    overflow: hidden;
}

.sidebar.collapsed .sidebar-content {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.sidebar-content {
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

/* Collapsed indicators */
.sidebar-collapsed-icons {
    display: none;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
}

.sidebar.collapsed .sidebar-collapsed-icons {
    display: flex;
}

.collapsed-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: 8px;
    font-size: 1.1rem;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s ease;
}

.collapsed-icon:hover {
    background: var(--border);
}

.collapsed-icon.active {
    border-color: var(--accent);
    background: rgba(6, 182, 212, 0.15);
}

/* Hide content when collapsed */
.sidebar.collapsed #analyze-btn {
    width: 40px !important;
    height: 40px;
    padding: 0 !important;
    font-size: 1.2rem;
    margin: 0 auto;
    margin: 0 auto;
}

.sidebar.collapsed #analyze-btn .btn-text {
    display: none;
}

.sidebar.collapsed .card {
    display: none;
}

/* Toggle switches */
.toggle-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toggle-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    transition: background 0.2s;
}

.toggle-item:hover {
    background: rgba(51, 65, 85, 0.8);
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
}

.toggle-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.toggle-switch {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.3s;
}

.toggle-switch.active {
    background: var(--accent);
}

.toggle-switch::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: transform 0.3s;
}

.toggle-switch.active::after {
    transform: translateX(20px);
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.stat-item {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

/* Loading state */
.loading {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 2rem;
    color: var(--text-secondary);
}

.loading.active {
    display: flex;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Status messages */
.status {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    display: none;
}

.status.active {
    display: block;
}

.status.success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

.status.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
}

/* Quadrant legend */
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    padding: 0.25rem 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
}

/* Timing info */
.timing-info {
    font-size: 0.8rem;
    color: var(--text-muted);
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
}

/* Opacity slider */
.opacity-control {
    margin-top: 1rem;
}

.opacity-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

/* Action buttons */
.action-buttons {
    display: flex;
    gap: 0.75rem;
}

.action-buttons .btn {
    flex: 1;
}

/* Zoom hint */
.zoom-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: 0.5rem;
}

/* Drawing canvas */
#drawing-canvas {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 5;
}

#drawing-canvas.drawing-active {
    pointer-events: auto;
    cursor: crosshair;
}

#drawing-canvas.eraser-active {
    pointer-events: auto;
    cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='8'/%3E%3C/svg%3E") 12 12, auto;
}

/* Placed tools container */
#placed-tools-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

.placed-tool {
    position: absolute;
    pointer-events: auto;
    cursor: move;
    user-select: none;
    transform-origin: center center;
}

.placed-tool img {
    width: 100%;
    height: 100%;
    pointer-events: none;
    user-select: none;
    -webkit-user-drag: none;
}

.placed-tool.selected {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
}

/* Tool handles */
.tool-handles {
    position: absolute;
    top: -8px;
    left: -8px;
    right: -8px;
    bottom: -8px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
}

.placed-tool.selected .tool-handles {
    opacity: 1;
}

.tool-handle {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border: 2px solid white;
    border-radius: 50%;
    pointer-events: auto;
    cursor: pointer;
}

.tool-handle.rotate {
    top: -24px;
    left: 50%;
    transform: translateX(-50%);
    cursor: grab;
    background: #8b5cf6;
}

.tool-handle.scale-nw {
    top: 0;
    left: 0;
    cursor: nw-resize;
}

.tool-handle.scale-ne {
    top: 0;
    right: 0;
    cursor: ne-resize;
}

.tool-handle.scale-sw {
    bottom: 0;
    left: 0;
    cursor: sw-resize;
}

.tool-handle.scale-se {
    bottom: 0;
    right: 0;
    cursor: se-resize;
}

.tool-handle.delete {
    top: -24px;
    right: -8px;
    background: var(--error);
    cursor: pointer;
}

.tool-handle.delete::before,
.tool-handle.delete::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 8px;
    height: 2px;
    background: white;
}

.tool-handle.delete::before {
    transform: translate(-50%, -50%) rotate(45deg);
}

.tool-handle.delete::after {
    transform: translate(-50%, -50%) rotate(-45deg);
}

/* Collapsible cards */
.collapsible-card .collapsible-header {
    cursor: pointer;
    user-select: none;
}

.collapsible-card .collapse-icon {
    font-size: 0.75rem;
    transition: transform 0.3s ease;
    color: var(--text-muted);
}

.collapsible-card.collapsed .collapse-icon {
    transform: rotate(-90deg);
}

.collapsible-card .collapsible-body {
    max-height: 500px;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease, opacity 0.3s ease;
}

.collapsible-card.collapsed .collapsible-body {
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    opacity: 0;
}

/* Drawing tools */
.drawing-mode-toggle {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.drawing-tool-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.drawing-tool-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

.drawing-tool-btn.active {
    border-color: var(--accent);
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent);
}

.drawing-control {
    margin-bottom: 0.75rem;
}

.drawing-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
    display: block;
}

.drawing-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.375rem;
}

.drawing-label-row span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.color-picker-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.color-picker-input {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    background: transparent;
    padding: 0;
}

.color-picker-input::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker-input::-webkit-color-swatch {
    border: 2px solid var(--border);
    border-radius: 6px;
}

.color-presets {
    display: flex;
    gap: 0.375rem;
    flex-wrap: wrap;
}

.color-preset {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s ease;
}

.color-preset:hover {
    transform: scale(1.1);
}

.color-preset.active {
    border-color: var(--accent);
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Placeable tools */
.tools-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    text-align: center;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.tool-item {
    aspect-ratio: 1;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    transition: all 0.2s ease;
}

.tool-item:hover {
    background: var(--border);
    border-color: var(--accent);
    transform: scale(1.02);
}

.tool-item img {
    width: 100%;
    height: 70%;
    object-fit: contain;
    filter: brightness(0.9);
}

.tool-item:hover img {
    filter: brightness(1.1);
}

.tool-item-name {
    font-size: 0.6rem;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.1;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}