:root {
    --primary-color: #4A90E2;
    --primary-hover-color: #357ABD;
    --secondary-color: #f0f4f8;
    --text-color: #333;
    --background-color: #fff;
    --border-color: #d1d5db;
    --danger-color: #e53e3e;
    --danger-hover-color: #c53030;
    --success-color: #2f855a;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    font-family: var(--font-family);
    background-color: var(--secondary-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    line-height: 1.6;
}

#app {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--background-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    overflow: hidden;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 20px 30px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2rem;
}

header p {
    margin: 5px 0 0;
    opacity: 0.9;
}

main {
    padding: 30px;
}

/* Upload Area */
.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    transition: background-color 0.2s ease, border-color 0.2s ease;
    cursor: pointer;
}

.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: #e9f2ff;
}

.file-input {
    width: 0.1px;
    height: 0.1px;
    opacity: 0;
    overflow: hidden;
    position: absolute;
    z-index: -1;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    color: var(--text-color);
    cursor: pointer;
}

.upload-label svg {
    fill: var(--primary-color);
    margin-bottom: 15px;
}

.upload-label strong {
    color: var(--primary-color);
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    margin: 25px 0;
}

.pdf-options {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 10px;
}

.filename-label {
    font-weight: 500;
}

.filename-input {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 8px 12px;
    font-size: 1rem;
}
.filename-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.3);
}

.a4-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-color);
}

.a4-label input[type="checkbox"] {
    margin-right: 8px;
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.generate-btn {
    background-color: var(--primary-color);
    color: white;
    font-size: 1.1rem;
    font-weight: bold;
    border: none;
    border-radius: 6px;
    padding: 12px 25px;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 180px;
}

.generate-btn:hover:not(:disabled) {
    background-color: var(--primary-hover-color);
    transform: translateY(-1px);
}

.generate-btn:disabled {
    background-color: #a0c7f1;
    cursor: not-allowed;
}

.pdf-link-container {
    margin-top: 10px;
}

.pdf-view-link {
    color: var(--success-color);
    font-weight: bold;
    text-decoration: none;
    font-size: 1.1rem;
    padding: 8px 12px;
    border-radius: 5px;
    transition: background-color 0.2s;
}

.pdf-view-link:hover {
    background-color: #e6f4ea;
    text-decoration: underline;
}


/* Image Grid */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.image-card {
    position: relative;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    height: 150px;
    cursor: grab;
    background-color: #f9f9f9;
}

.image-card:active {
    cursor: grabbing;
}

.thumbnail {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.sortable-ghost {
    opacity: 0.4;
    border: 2px dashed var(--primary-color);
}


/* Image Actions */
.image-actions {
    position: absolute;
    top: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    padding: 5px;
    background-color: rgba(0, 0, 0, 0.4);
    border-bottom-left-radius: 6px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.image-card:hover .image-actions {
    opacity: 1;
}

.icon-btn {
    background: none;
    border: none;
    padding: 5px;
    cursor: pointer;
    color: white;
}

.icon-btn svg {
    width: 20px;
    height: 20px;
    transition: transform 0.2s;
}

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

.remove-btn:hover {
    color: #ff9f9f;
}
.crop-btn:hover {
    color: #9fe8ff;
}

/* Modal */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--background-color);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    width: 90%;
    max-width: 800px;
}

.modal-content h3 {
    margin-top: 0;
    margin-bottom: 20px;
}

.crop-container {
    margin-bottom: 20px;
    max-height: 70vh;
    overflow: hidden;
}

/* Cropper.js overrides */
.cropper-view-box,
.cropper-face {
  border-radius: 4px;
}
.cropper-container {
    margin: 0 auto;
}

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

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
}
.btn-primary:hover {
    background-color: var(--primary-hover-color);
}

.btn-secondary {
    background-color: #ccc;
    color: var(--text-color);
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
}
.btn-secondary:hover {
    background-color: #bbb;
}

/* Spinner */
.spinner {
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    width: 20px;
    height: 20px;
    animation: spin 1s ease-in-out infinite;
}

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