/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --dark-bg: #0f0f23;
    --sidebar-bg: rgba(255, 255, 255, 0.03);
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-hint: rgba(255, 255, 255, 0.5);
    --hover-overlay: rgba(255, 255, 255, 0.1);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    /* Layout */
    --sidebar-width: 320px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--dark-bg);
    background-image:
        radial-gradient(ellipse at top left, rgba(102, 126, 234, 0.15), transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(118, 75, 162, 0.15), transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.5;
    overflow: hidden;
    height: 100vh;
}

/* App Container */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--card-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--card-border);
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.gradient-text {
    background: var(--primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 300;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-md);
}

.sidebar-content::-webkit-scrollbar {
    width: 6px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

/* Control Sections */
.control-section {
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Tabs */
.tab-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.tab-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.tab-btn:hover {
    background: var(--hover-overlay);
    border-color: rgba(255, 255, 255, 0.3);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--primary);
    border-color: transparent;
    color: var(--text-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Dropzone Compact */
.dropzone-compact {
    border: 2px dashed var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.02);
}

.dropzone-compact:hover,
.dropzone-compact.dragover {
    border-color: rgba(102, 126, 234, 0.5);
    background: rgba(102, 126, 234, 0.05);
}

.dropzone-compact svg {
    color: var(--text-hint);
    margin-bottom: var(--spacing-xs);
}

.dropzone-text-compact {
    font-size: 0.875rem;
    color: var(--text-primary);
}

/* URL Input Compact */
.url-input-compact {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
    transition: all 0.2s ease;
}

.url-input-compact:focus {
    outline: none;
    border-color: rgba(102, 126, 234, 0.5);
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.1);
}

.url-input-compact::placeholder {
    color: var(--text-hint);
}

/* Method Selector Compact */
.method-selector-compact {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xs);
}

.method-option-compact {
    cursor: pointer;
}

.method-option-compact input[type="radio"] {
    display: none;
}

.method-card-compact {
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    text-align: center;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.method-card-compact svg {
    color: var(--text-hint);
    transition: all 0.2s ease;
}

.method-card-compact span {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.method-option-compact:hover .method-card-compact {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

.method-option-compact input[type="radio"]:checked+.method-card-compact {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.2) 100%);
    border-color: rgba(102, 126, 234, 0.5);
}

.method-option-compact input[type="radio"]:checked+.method-card-compact svg {
    color: #667eea;
}

/* Method Settings */
.method-settings {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.input-label-compact {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.text-input-compact {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.text-input-compact:focus {
    outline: none;
    border-color: rgba(102, 126, 234, 0.5);
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.1);
}

/* Slider */
.slider {
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    margin-bottom: var(--spacing-sm);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
}

/* Tool Selector Compact */
.tool-selector-compact {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.tool-selector-compact .btn {
    padding: var(--spacing-xs);
}

.tool-selector-compact .btn.active {
    background: var(--primary);
    border-color: transparent;
}

/* File Upload Compact */
.file-upload-compact {
    border: 2px dashed var(--card-border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.02);
}

.file-upload-compact:hover {
    border-color: rgba(102, 126, 234, 0.5);
    background: rgba(102, 126, 234, 0.05);
}

.file-upload-compact svg {
    color: var(--text-hint);
    margin-bottom: var(--spacing-xs);
}

.file-upload-compact p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Hint Text */
.hint-text-compact {
    font-size: 0.75rem;
    color: var(--text-hint);
    margin-bottom: var(--spacing-sm);
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-family: inherit;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary {
    background: var(--primary);
    color: var(--text-primary);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
}

.btn-success {
    background: var(--success);
    color: var(--text-primary);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-large {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1rem;
    margin-top: var(--spacing-md);
}

/* Main Content Area */
.main-content-area {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
    background: var(--card-border);
    overflow: hidden;
}

/* Panels */
.editor-panel,
.result-panel {
    background: var(--dark-bg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--card-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.zoom-indicator {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
    padding: 2px 8px;
    border-radius: 10px;
}

.panel-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Canvas Wrapper */
.canvas-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.2);
    overflow: hidden;
    /* We'll handle panning via JS translation */
}

.editor-hints {
    position: absolute;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: 4px;
    pointer-events: none;
    z-index: 20;
}

.editor-hints span {
    font-size: 0.7rem;
    color: var(--text-hint);
    background: rgba(0, 0, 0, 0.4);
    padding: 2px 8px;
    border-radius: 4px;
    backdrop-filter: blur(2px);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-hint);
    gap: var(--spacing-md);
}

.empty-state svg {
    opacity: 0.3;
}

.empty-state p {
    font-size: 0.875rem;
}

#mask-canvas,
#preview-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block;
}

.canvas-layers {
    position: relative;
    display: block;
}

#mask-canvas {
    position: absolute;
    top: 0;
    left: 0;
    cursor: crosshair;
    z-index: 10;
}

#preview-image {
    display: block;
    z-index: 5;
}


/* Result Image Wrapper */
.result-image-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.2);
    overflow: auto;
    padding: var(--spacing-md);
}

.result-image-full {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 1000;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    margin-top: var(--spacing-md);
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 280px;
    }

    .main-content-area {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        max-height: 40vh;
        border-right: none;
        border-bottom: 1px solid var(--card-border);
    }

    .main-content-area {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
    }
}