/* ==========================================================================
   Atom Note-Taking System Styling
   ========================================================================== */

/* Workspace Dashboard */
.atom-workspace {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-main);
    z-index: 100;
    color: var(--text-primary);
}

.atom-dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-light);
    background: rgba(15, 23, 42, 0.3);
    backdrop-filter: blur(10px);
}

.atom-dashboard-title {
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, #a78bfa 0%, #a78bfa 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.atom-dashboard-title span {
    -webkit-text-fill-color: initial;
}

.atom-dashboard-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.atom-search-bar {
    display: flex;
    align-items: center;
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    padding: 0.5rem 1rem;
    width: 280px;
    gap: 0.5rem;
}

.atom-search-bar input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    width: 100%;
    font-size: var(--text-sm);
}

.atom-search-bar svg {
    color: var(--text-muted);
}

.atom-grid {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    align-content: start;
}

/* Notebook Cards */
.notebook-card {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
    cursor: pointer;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.2s;
}

.notebook-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
}

.notebook-preview-area {
    height: 140px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-muted);
    font-size: 3rem;
    position: relative;
    overflow: hidden;
}

.notebook-preview-decoration {
    position: absolute;
    width: 60px;
    height: 80px;
    background: #1e293b;
    border-radius: 4px;
    border-left: 6px solid var(--accent);
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    transform: rotate(-10deg);
}

.notebook-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.notebook-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.notebook-meta {
    font-size: var(--text-xs);
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
}

.notebook-badge {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    padding: 0.1rem 0.5rem;
    font-size: 0.75rem;
}

.notebook-card-delete-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 10;
}

.notebook-card:hover .notebook-card-delete-btn {
    opacity: 1;
}

.notebook-card-delete-btn:hover {
    background: rgba(239, 68, 68, 0.2);
    transform: scale(1.1);
}

/* Notebook Editor Split Workspace */
.atom-editor {
    flex: 1;
    display: flex;
    position: relative;
    overflow: hidden;
}

/* Left Page Thumbnails Sidebar */
.atom-thumbnails-sidebar {
    width: 240px;
    border-right: 1px solid var(--border-light);
    background: rgba(15, 23, 42, 0.15);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.atom-thumbnails-header {
    padding: 1rem;
    font-size: var(--text-xs);
    font-weight: 800;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-light);
}

.atom-thumbnails-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.thumbnail-card {
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    background: rgba(0,0,0,0.2);
    padding: 0.25rem;
    cursor: pointer;
    transition: border-color 0.2s, transform 0.1s;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.thumbnail-card.active {
    border-color: var(--accent);
    transform: scale(1.02);
}

.thumbnail-canvas-container {
    height: 120px;
    background: white;
    border-radius: 4px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.15);
}

.thumbnail-canvas-container canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.thumbnail-num {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
}

/* Center Canvas Viewport Scroll Container */
.atom-viewport {
    flex: 1;
    overflow-y: auto;
    background: #0b0f19;
    padding: 5rem 2rem 4rem;  /* top pad clears the floating toolbar */
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    scroll-behavior: smooth;
    position: relative;
}

/* Floating Toolbar — sticky at top of editor, scrolls with viewport but stays visible */
.atom-floating-toolbar {
    position: absolute;
    top: 0.75rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.6), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    z-index: 300;
    transition: opacity 0.2s;
    /* Positioned inside .atom-editor which is position:relative — stays above viewport scroll */
}

.atom-tool-group {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.atom-toolbar-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.atom-toolbar-btn:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.atom-toolbar-btn.active {
    color: white;
    background: var(--accent);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

.atom-toolbar-divider {
    width: 1px;
    height: 24px;
    background: rgba(255,255,255,0.1);
}

/* Custom Tool Popovers / Adjustments inside toolbar */
.atom-color-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.15s, border-color 0.15s;
}

.atom-color-dot:hover {
    transform: scale(1.2);
}

.atom-color-dot.active {
    border-color: white;
    transform: scale(1.25);
}

.atom-stroke-slider {
    width: 80px;
    accent-color: var(--accent);
    cursor: pointer;
}

/* Document Pages */
.atom-page-card {
    background: #ffffff;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4), 0 5px 15px rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    position: relative;
    transition: box-shadow 0.3s;
    overflow: visible;
    flex-shrink: 0; /* Prevent collapsing in flex layouts */
}

.atom-page-card.active-page {
    box-shadow: 0 0 0 2px var(--accent), 0 15px 30px rgba(0, 0, 0, 0.5);
}

/* Ruled / Grid Paper Styles */
.grid-paper {
    background-size: 30px 30px;
    background-image: 
        linear-gradient(to right, rgba(99, 102, 241, 0.05) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(99, 102, 241, 0.05) 1px, transparent 1px);
    background-color: #0f172a !important; /* Dark Notability mode */
}

.ruled-paper {
    background-size: 100% 28px;
    background-image: 
        linear-gradient(to bottom, transparent 27px, rgba(99, 102, 241, 0.08) 27px);
    background-color: #0f172a !important;
    position: relative;
}

.ruled-paper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 60px;
    bottom: 0;
    width: 1px;
    background: rgba(244, 63, 94, 0.2); /* Pink margin line */
}

/* Layering overlays on page cards */
.atom-pdf-render-layer {
    position: absolute;
    top: 0;
    left: 0;
    /* width/height set by JS to match exact PDF pixel dimensions */
    z-index: 1;
    pointer-events: none;
    border-radius: 8px;
    display: block;
}

.atom-annotation-layer {
    position: absolute;
    top: 0;
    left: 0;
    /* width/height set by JS to match page canvas dimensions */
    z-index: 2;
    cursor: url("data:image/svg+xml;base64,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") 12 12, crosshair;
    border-radius: 8px;
    background: transparent;
}

.atom-annotation-layer.cursor-pan {
    cursor: grab;
}

.atom-annotation-layer.cursor-pan:active {
    cursor: grabbing;
}

.atom-annotation-layer.cursor-text {
    cursor: text;
}

/* Text Annotations Overlays inside Editor */
.atom-text-annotation {
    position: absolute;
    min-width: 60px;
    min-height: 24px;
    padding: 4px;
    border: 1px dashed transparent;
    color: var(--text-primary);
    font-family: inherit;
    outline: none;
    z-index: 10;
    word-wrap: break-word;
    border-radius: 4px;
    overflow: visible;
}

.atom-text-annotation:hover {
    border-color: rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.02);
}

.atom-text-annotation:focus {
    border-color: var(--accent);
    background: rgba(0,0,0,0.3);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Page Control Labels inside viewport */
.atom-page-meta {
    position: absolute;
    bottom: -1.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    display: flex;
    gap: 1rem;
}

.atom-page-delete-btn {
    color: #ef4444;
    cursor: pointer;
    background: transparent;
    border: none;
    font-size: 0.75rem;
    font-weight: 600;
}

.atom-page-delete-btn:hover {
    text-decoration: underline;
}

/* Quick Floating action to Add Page at the bottom */
.atom-add-page-fab {
    margin: 2rem 0;
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    padding: 0.6rem 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: var(--text-sm);
    transition: background 0.2s, border-color 0.2s, transform 0.15s;
}

.atom-add-page-fab:hover {
    background: var(--border-light);
    border-color: var(--accent);
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* Modal Config templates for New Notebook */
.atom-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 500;
    transition: opacity 0.2s ease-in-out;
}

/* --- Atom Editor Mobile Media Queries --- */
@media (max-width: 768px) {
    /* Hide the left thumbnails sidebar inside Atom workspace to maximize drawing area */
    .atom-thumbnails-sidebar {
        display: none !important;
    }
    
    /* Shrink padding and margins on the floating toolbar */
    .atom-floating-toolbar {
        top: 0.5rem !important;
        left: 0.5rem !important;
        right: 0.5rem !important;
        transform: none !important;
        width: calc(100% - 1rem) !important;
        padding: 0.4rem 0.6rem !important;
        border-radius: var(--radius-sm) !important;
        gap: 0.4rem !important;
    }
    
    /* Make toolbar icons slightly smaller on phone screens */
    .atom-toolbar-icon-btn {
        width: 32px !important;
        height: 32px !important;
    }
    
    /* Reduce toolbar dividers */
    .atom-toolbar-divider {
        height: 18px !important;
    }
    
    /* Optimize pages viewport scroll */
    .atom-pages-viewport {
        padding: 4.5rem 0.5rem 1rem 0.5rem !important;
    }
    
    .atom-page-card {
        width: 100% !important;
        max-width: 100% !important;
        border-radius: var(--radius-sm) !important;
    }
}