/* 
   Scoping to .epp-app ensures this CSS does NOT leak into your website's main theme 
*/
.epp-app {
    --epp-bg-main: #09090b;
    --epp-bg-panel: #18181b;
    --epp-bg-input: #000000;
    --epp-accent: #8b5cf6;       /* Violet / Neon Purple */
    --epp-accent-hover: #7c3aed;
    --epp-accent-dim: rgba(139, 92, 246, 0.15);
    --epp-text-main: #f8fafc;
    --epp-text-muted: #a1a1aa;
    --epp-border: #27272a;
    --epp-danger: #ef4444;
    --epp-success: #10b981;
    
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--epp-bg-main);
    color: var(--epp-text-main);
    
    /* Full screen scaling mechanism */
    width: 100%;
    height: 100vh;
    min-height: 600px;
    display: flex;
    flex-direction: row;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--epp-border);
    border-radius: 12px;
}

.epp-app * {
    box-sizing: border-box;
}

/* --- Sidebar --- */
.epp-sidebar {
    width: 360px;
    min-width: 360px;
    background-color: var(--epp-bg-panel);
    border-right: 1px solid var(--epp-border);
    display: flex;
    flex-direction: column;
    padding: 24px;
    overflow-y: auto;
    z-index: 10;
}

.epp-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.epp-logo {
    background: linear-gradient(135deg, var(--epp-accent), #3b82f6);
    padding: 10px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.epp-header svg {
    width: 24px;
    height: 24px;
    color: #fff;
}

.epp-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0;
    color: #ffffff;
    letter-spacing: -0.5px;
}

.epp-title span {
    color: var(--epp-accent);
}

.epp-subtitle {
    font-size: 0.8rem;
    color: var(--epp-text-muted);
    margin: 2px 0 0 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Upload Zone */
.epp-upload-zone {
    border: 2px dashed var(--epp-border);
    border-radius: 12px;
    padding: 24px 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background-color: rgba(24, 24, 27, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.epp-upload-zone:hover, .epp-upload-zone.epp-dragover {
    border-color: var(--epp-accent);
    background-color: var(--epp-accent-dim);
}

.epp-upload-zone svg {
    width: 32px;
    height: 32px;
    color: var(--epp-accent);
}

.epp-upload-zone span {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--epp-text-main);
}

/* Controls */
.epp-controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
    transition: opacity 0.3s;
}

.epp-controls.disabled {
    opacity: 0.3;
    pointer-events: none;
}

/* Stats Panel */
.epp-stats-panel {
    display: flex;
    gap: 12px;
}

.epp-stat {
    flex: 1;
    background-color: var(--epp-bg-input);
    border: 1px solid var(--epp-border);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.epp-stat-active {
    border-color: rgba(139, 92, 246, 0.5);
    background-color: var(--epp-accent-dim);
}

.epp-stat-val {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--epp-text-main);
    line-height: 1;
}

.epp-stat-active .epp-stat-val {
    color: var(--epp-accent);
}

.epp-stat-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--epp-text-muted);
    font-weight: 600;
}

.epp-control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.epp-control-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--epp-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.epp-input {
    width: 100%;
    background-color: var(--epp-bg-input);
    border: 1px solid var(--epp-border);
    color: var(--epp-text-main);
    padding: 12px 14px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    font-family: inherit;
    transition: all 0.2s;
    outline: none;
}

.epp-input:focus {
    border-color: var(--epp-accent);
    box-shadow: 0 0 0 3px var(--epp-accent-dim);
}

.epp-hint {
    font-size: 0.75rem;
    color: var(--epp-text-muted);
}

.epp-selection-actions {
    display: flex;
    gap: 12px;
}

.epp-btn-outline {
    flex: 1;
    background: transparent;
    border: 1px solid var(--epp-border);
    color: var(--epp-text-muted);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.epp-btn-outline:hover {
    border-color: var(--epp-text-main);
    color: var(--epp-text-main);
}

/* Actions */
.epp-sidebar-actions {
    margin-top: auto;
    padding-top: 24px;
}

.epp-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 16px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    color: #ffffff;
}

.epp-btn svg { width: 18px; height: 18px; }
.epp-btn:active:not(:disabled) { transform: scale(0.97); }

.epp-btn-primary { background-color: var(--epp-accent); }
.epp-btn-primary:hover:not(:disabled) { background-color: var(--epp-accent-hover); box-shadow: 0 4px 15px var(--epp-accent-dim); }

.epp-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(1);
}

.epp-extract-btn {
    padding: 18px 16px;
    font-size: 1.05rem;
}

/* --- Main Workspace --- */
.epp-workspace {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-image: radial-gradient(var(--epp-border) 1px, transparent 1px);
    background-size: 24px 24px;
    overflow: hidden;
}

.epp-workspace-header {
    padding: 24px 32px 12px 32px;
    border-bottom: 1px solid var(--epp-border);
    background-color: rgba(9, 9, 11, 0.8);
    backdrop-filter: blur(10px);
    z-index: 5;
}

.epp-workspace-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--epp-text-main);
    margin: 0;
}

.epp-grid-container {
    flex-grow: 1;
    padding: 32px;
    overflow-y: auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 32px;
    align-content: flex-start;
}

.epp-empty-state {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--epp-text-muted);
    font-size: 1.1rem;
    margin-top: 100px;
    opacity: 0.7;
}

/* Page Card Thumbnails */
.epp-page-card {
    background-color: #ffffff; /* Paper white */
    border-radius: 4px;
    overflow: hidden;
    position: relative;
    aspect-ratio: 1 / 1.414; /* Standard A4 paper ratio */
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 3px solid transparent;
}

.epp-page-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.6);
}

.epp-page-card canvas {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.epp-page-number {
    position: absolute;
    bottom: -28px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--epp-text-muted);
}

/* Selected State */
.epp-page-card.epp-selected {
    border-color: var(--epp-accent);
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 15px 35px var(--epp-accent-dim);
}

.epp-page-card.epp-selected .epp-page-number {
    color: var(--epp-accent);
}

.epp-check-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 28px;
    height: 28px;
    background-color: var(--epp-accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0);
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.epp-check-badge svg { width: 16px; height: 16px; }

.epp-page-card.epp-selected .epp-check-badge {
    opacity: 1;
    transform: scale(1);
}

/* Loader Overlay */
.epp-loader {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(9, 9, 11, 0.9);
    backdrop-filter: blur(5px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.epp-loader.active {
    opacity: 1;
    pointer-events: all;
}

.epp-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--epp-border);
    border-top-color: var(--epp-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

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

.epp-loader-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--epp-text-main);
    letter-spacing: 1px;
}

/* Toast */
.epp-toast {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--epp-success);
    color: white;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.95rem;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 110;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.epp-toast.epp-show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Responsive Constraints */
@media (max-width: 860px) {
    .epp-app {
        flex-direction: column;
        height: auto;
        min-height: 100vh;
    }
    .epp-sidebar {
        width: 100%;
        min-width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--epp-border);
    }
    .epp-workspace {
        min-height: 60vh;
    }
    .epp-grid-container {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 24px;
    }
}