:root {
    /* Slate Theme Palette (Augenschonend) */
    --primary-color: #29b6f6;
    --primary-hover: #0288d1;
    --success-color: #66bb6a;
    --danger-color: #ef5350;
    --warning-color: #ffa726; 
    --crop-color: #ab47bc; 
    --info-color: #00acc1; /* NEU: Für den 2-auf-1 Button */
    --info-hover: #00838f; /* NEU: Hover für 2-auf-1 Button */
    
    --bg-color: #546e7a;
    --app-bg: #eceff1;
    --card-bg: #ffffff;
    --text-color: #37474f;
    
    --border-radius: 8px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    line-height: 1.6;
    min-height: 100vh;
}

/* Der Hauptcontainer ist die Drop-Zone */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px;
    background-color: var(--app-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    
    border: 3px solid transparent; 
    transition: all 0.3s ease;
}

.app-container.drag-over {
    background-color: #e3f2fd;
    border-color: var(--primary-color);
    border-style: dashed;
    transform: scale(1.01);
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: #263238;
}

/* Steuerelemente */
.controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    background: #cfd8dc;
    padding: 20px;
    border-radius: var(--border-radius);
}

.input-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="file"] {
    display: none;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: background 0.3s, transform 0.1s;
    color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    background-color: #b0bec5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

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

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

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

.btn-success:hover {
    background-color: #43a047;
}

/* NEU: Info Button für 2-auf-1 Funktion */
.btn-info {
    background-color: var(--info-color);
}

.btn-info:hover {
    background-color: var(--info-hover);
}

/* Grid Layout */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 20px;
    padding: 20px;
    min-height: 250px;
    border: 3px dashed #b0bec5;
    border-radius: var(--border-radius);
    background-color: #fafafa;
    transition: background-color 0.2s;
    position: relative;
}

.grid-container:empty:before {
    content: "PDFs hier reinziehen";
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    width: 100%;
    color: #90a4ae;
    font-size: 1.2rem;
    position: absolute;
    top: 0; left: 0;
}

/* Einzelne Seiten-Karte */
.page-card {
    background: var(--card-bg);
    border: 1px solid #cfd8dc;
    border-radius: var(--border-radius);
    padding: 10px;
    position: relative;
    cursor: grab;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-bottom: 40px; 
}

.page-card:hover {
    box-shadow: 0 8px 16px rgba(0,0,0,0.15);
    transform: translateY(-2px);
    z-index: 10;
}

.page-card canvas {
    max-width: 100%;
    height: auto;
    border: 1px solid #eee;
    margin-bottom: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: transform 0.3s ease; 
}

.page-info {
    font-size: 12px;
    color: #78909c;
    text-align: center;
    margin-bottom: 0;
    word-break: break-all;
    font-weight: 500;
}

/* Buttons auf der Karte */
.card-btn {
    position: absolute;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    opacity: 0;
    transition: opacity 0.2s, transform 0.2s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    border: 2px solid white;
    color: white;
    z-index: 2;
}

.page-card:hover .card-btn {
    opacity: 1;
}

.card-btn:hover {
    transform: scale(1.1);
}

/* Löschen Button (Rechts oben) */
.delete-btn {
    top: -12px;
    right: -12px;
    background: var(--danger-color);
    font-size: 16px;
}

/* Zoom Button (Links oben) */
.zoom-btn {
    top: -12px;
    left: -12px;
    background: var(--primary-color);
    font-size: 14px;
}

/* Crop Button (Mitte oben) */
.crop-btn {
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--crop-color);
    font-size: 14px;
}

.page-card:hover .crop-btn {
    transform: translateX(-50%) scale(1);
}

.crop-btn:hover {
    transform: translateX(-50%) scale(1.1) !important;
}

/* Rotation Buttons (Unten) */
.rotate-btn {
    background: var(--warning-color);
    font-size: 16px;
    bottom: 5px;
}

.rotate-left {
    left: 5px;
}

.rotate-right {
    right: 5px;
}

/* SortableJS Klassen */
.sortable-ghost {
    opacity: 0.4;
    background-color: #cfd8dc;
    border: 2px dashed #90a4ae;
}

.sortable-drag {
    cursor: grabbing;
}

/* Ladeindikator */
.hidden {
    display: none !important;
}

#loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 20px 0;
    color: var(--text-color);
}

.spinner {
    border: 4px solid #cfd8dc;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

#loading-indicator .spinner {
    margin-bottom: 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Lightbox Styles */
#lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(38, 50, 56, 0.9);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

#lightbox-canvas {
    max-width: 100%;
    max-height: 90vh;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    border-radius: 4px;
    background: white;
}

#lightbox-close {
    position: absolute;
    top: -40px;
    right: -40px;
    color: white;
    font-size: 40px;
    cursor: pointer;
    font-weight: bold;
    transition: color 0.2s;
    line-height: 1;
}

#lightbox-close:hover {
    color: var(--danger-color);
}

#lightbox-loader {
    position: absolute;
}

/* Lightbox Navigation */
.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    font-size: 60px;
    cursor: pointer;
    padding: 20px;
    user-select: none;
    transition: all 0.2s;
    z-index: 1001;
    outline: none;
}

.lightbox-nav:hover {
    color: var(--primary-color);
    transform: translateY(-50%) scale(1.1);
    background-color: rgba(0,0,0,0.1);
    border-radius: 50%;
}

#lightbox-prev {
    left: 20px;
}

#lightbox-next {
    right: 20px;
}

/* Modal Base Styles (Save & Crop) */
#save-modal, #crop-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(38, 50, 56, 0.8);
    z-index: 1100; 
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(3px);
}

#crop-modal {
    z-index: 1200; 
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 450px;
    box-shadow: 0 15px 30px rgba(0,0,0,0.3);
    text-align: center;
}

/* Spezifische Cropper Modal Styles */
.crop-modal-content {
    max-width: 90vw;
    width: 800px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.crop-container {
    width: 100%;
    height: 60vh;
    background-color: #eceff1;
    margin: 20px 0;
    border-radius: 4px;
    overflow: hidden;
}

.crop-container img {
    display: block;
    max-width: 100%;
}

.modal-content h3 {
    margin-top: 0;
    color: #263238;
}

.filename-wrapper {
    display: flex;
    align-items: center;
    margin: 20px 0;
    gap: 5px;
}

#filename-input {
    flex: 1;
    padding: 10px;
    font-size: 16px;
    border: 2px solid #cfd8dc;
    border-radius: 4px;
    outline: none;
    transition: border-color 0.2s;
}

#filename-input:focus {
    border-color: var(--primary-color);
}

.extension {
    font-weight: bold;
    color: #78909c;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

.modal-actions .btn {
    padding: 10px 20px;
    font-size: 14px;
}

#cancel-save, #cancel-crop {
    background-color: #90a4ae;
}

#cancel-save:hover, #cancel-crop:hover {
    background-color: #78909c;
}