/* --- PREMIUM DESIGN SYSTEM & VARIABLES --- */
:root {
    --bg-main: #0b0f19;
    --bg-surface: rgba(17, 24, 39, 0.75);
    --bg-surface-solid: #111827;
    --bg-surface-hover: rgba(31, 41, 55, 0.85);
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-focus: rgba(99, 102, 241, 0.6);
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    --accent-gradient: linear-gradient(135deg, #a855f7 0%, #7c3aed 100%);
    
    --color-primary: #6366f1;
    --color-accent: #a855f7;
    --color-success: #10b981;
    --color-danger: #ef4444;
    
    --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    
    --shadow-sm: 0 2px 8px -1px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 20px 48px -12px rgba(0, 0, 0, 0.5);
    
    --backdrop-blur: blur(12px);
    --border-radius: 12px;
}

/* --- RESET & GLOBAL STYLES --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-main);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

button, input, select {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

/* --- LAYOUT STRUCTURE --- */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* --- HEADER --- */
.app-header {
    height: 70px;
    background-color: var(--bg-surface-solid);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 10;
    box-shadow: var(--shadow-sm);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 32px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 8px rgba(99, 102, 241, 0.4));
}

.logo-text h1 {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1;
}

.logo-text h1 span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text .tagline {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* --- BUTTONS --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition-fast);
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
}

.btn-primary-gradient {
    background: var(--primary-gradient);
    color: white;
    padding: 12px 24px;
    font-size: 15px;
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary-gradient:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.12);
}

.btn-accent {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 14px rgba(168, 85, 247, 0.35);
}

.btn-accent:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(168, 85, 247, 0.45);
}

.btn-accent-outline {
    background: transparent;
    border: 1px solid var(--color-accent);
    color: #c084fc;
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-accent-outline:hover:not(:disabled) {
    background: rgba(168, 85, 247, 0.15);
    color: white;
}

.btn-text {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 12px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition-fast);
}

.btn-text:hover:not(:disabled) {
    color: var(--text-primary);
}

.btn:disabled, .btn-accent-outline:disabled, .btn-text:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* --- MAIN LAYOUT --- */
.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* --- SIDEBAR --- */
.sidebar {
    width: 280px;
    background-color: var(--bg-surface-solid);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-header h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.sidebar-actions {
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.thumbnails-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.empty-sidebar-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--text-muted);
    text-align: center;
    gap: 12px;
}

.empty-sidebar-state i {
    font-size: 32px;
}

.empty-sidebar-state p {
    font-size: 13px;
}

/* Thumbnail Item Styling */
.thumbnail-item {
    position: relative;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    padding: 6px;
    background: rgba(255, 255, 255, 0.02);
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
    width: 140px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.thumbnail-item:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.03);
}

.thumbnail-item.selected {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.08);
}

.thumbnail-canvas-container {
    width: 120px;
    height: auto;
    overflow: hidden;
    border-radius: 4px;
    background-color: white;
    display: flex;
    align-items: center;
    justify-content: center;
}

.thumbnail-canvas-container canvas {
    width: 100% !important;
    height: auto !important;
    display: block;
}

.thumbnail-checkbox {
    position: absolute;
    top: 10px;
    left: 10px;
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
    cursor: pointer;
    opacity: 0;
    transition: var(--transition-fast);
    z-index: 2;
}

.thumbnail-item:hover .thumbnail-checkbox,
.thumbnail-checkbox:checked,
.thumbnail-item.selected .thumbnail-checkbox {
    opacity: 1;
}

.thumbnail-number {
    margin-top: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

/* --- WORKSPACE --- */
.workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-main);
    position: relative;
    overflow: hidden;
}

/* --- TOOLBAR --- */
.toolbar {
    height: 60px;
    background-color: var(--bg-surface);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 0 20px;
    z-index: 5;
    box-shadow: var(--shadow-sm);
}

.tool-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-btn {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.tool-btn:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.tool-btn.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
}

.tool-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
}

.zoom-text {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 45px;
    text-align: center;
}

/* Text Editor Specific Tool Styling */
.setting-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.setting-item label {
    font-size: 13px;
    color: var(--text-muted);
}

.setting-item input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    background: none;
}

.setting-item input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.setting-item input[type="color"]::-webkit-color-swatch {
    border: 1px solid var(--border-color);
    border-radius: 50%;
}

.setting-item select {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 4px 8px;
    font-size: 12px;
    outline: none;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.setting-item select:focus {
    border-color: var(--color-primary);
}

.setting-item select option {
    background-color: var(--bg-surface-solid);
    color: var(--text-primary);
}

/* --- PDF VIEWER --- */
.pdf-viewer-outer {
    flex: 1;
    overflow: auto;
    padding: 40px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    position: relative;
}

.pdf-viewer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
}

/* Page Wrapper */
.pdf-page-container {
    position: relative;
    background-color: white;
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    overflow: visible; /* Need overflow visible so handles/buttons on borders can overlay properly */
    transition: transform var(--transition-normal);
}

.pdf-page-container canvas {
    display: block;
    border-radius: 8px;
}

/* Interaction Overlay Layer */
.interaction-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    pointer-events: auto;
}

/* Enable pointer events in text tool mode */
.interaction-overlay.text-mode-active {
    cursor: text;
}

/* Text Element Overlay */
.text-element-overlay {
    position: absolute;
    padding: 4px 8px;
    border: 1px dashed transparent;
    cursor: move;
    user-select: none;
    border-radius: 4px;
    display: inline-block;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
    outline: none;
    white-space: pre-wrap;
    min-width: 40px;
    min-height: 24px;
}

.text-element-overlay:hover {
    border-color: var(--color-primary);
    background-color: rgba(99, 102, 241, 0.05);
}

.text-element-overlay:focus-within {
    border-color: var(--color-accent);
    background-color: rgba(168, 85, 247, 0.08);
}

.text-element-overlay .text-input {
    background: transparent;
    border: none;
    outline: none;
    color: inherit;
    font-size: inherit;
    font-weight: bold;
    width: 100%;
    height: 100%;
    resize: none;
    overflow: hidden;
    font-family: Helvetica, Arial, sans-serif;
    padding: 0;
    margin: 0;
}

/* Remove button for text overlay */
.text-element-delete-btn {
    position: absolute;
    top: -12px;
    right: -12px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--color-danger);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-fast);
    box-shadow: var(--shadow-sm);
    z-index: 10;
    border: none;
}

.text-element-overlay:hover .text-element-delete-btn {
    opacity: 1;
}

/* --- DROP ZONE (UPLOAD) --- */
.drop-zone {
    width: 100%;
    max-width: 600px;
    border: 2px dashed rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    padding: 60px 40px;
    text-align: center;
    background-color: var(--bg-surface);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    transition: var(--transition-normal);
    margin: auto;
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--color-primary);
    background-color: rgba(99, 102, 241, 0.03);
    transform: translateY(-2px);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.pulse-icon-container {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(99, 102, 241, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 38px;
    color: var(--color-primary);
    animation: icon-pulse 2s infinite ease-in-out;
}

@keyframes icon-pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.4);
    }
    70% {
        transform: scale(1.05);
        box-shadow: 0 0 0 15px rgba(99, 102, 241, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0);
    }
}

.drop-zone h2 {
    font-size: 22px;
    font-weight: 700;
}

.drop-zone p {
    color: var(--text-secondary);
    font-size: 15px;
    max-width: 320px;
}

.file-limits {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
}

/* --- MODAL DIALOGS --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.modal-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: transform var(--transition-normal);
    overflow: hidden;
}

.modal-overlay.open .modal {
    transform: translateY(0);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    font-size: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-header h2 i {
    color: var(--color-success);
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.modal-body p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.share-link-box {
    display: flex;
    gap: 10px;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 6px 6px 6px 12px;
    align-items: center;
}

.share-link-box input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-size: 14px;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
}

/* --- TOAST NOTIFICATIONS --- */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 1000;
}

.toast {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--color-primary);
    padding: 14px 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    font-weight: 600;
    min-width: 250px;
    transform: translateX(120%);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    border-left-color: var(--color-success);
}

.toast.error {
    border-left-color: var(--color-danger);
}

.toast i {
    font-size: 16px;
}

.toast.success i { color: var(--color-success); }
.toast.error i { color: var(--color-danger); }
.toast.info i { color: var(--color-primary); }

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* --- DASHBOARD: RIGHT PANEL --- */
.dashboard {
    width: 320px;
    background-color: var(--bg-surface-solid);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 10;
    box-shadow: var(--shadow-sm);
}

.dashboard-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.15);
    height: 60px;
}

.tab-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.tab-btn i {
    font-size: 16px;
}

.tab-btn:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    background-color: rgba(255, 255, 255, 0.04);
}

.tab-content {
    display: none;
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

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

/* --- DASHBOARD COMPONENTS & FORM STYLING --- */
.dashboard-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.dashboard-section h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.section-desc {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.text-danger-soft {
    color: #fca5a5 !important;
}

.divider-horizontal {
    height: 1px;
    background-color: var(--border-color);
    margin: 16px 0 24px 0;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.form-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input[type="text"],
.form-group select {
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 13px;
    color: var(--text-primary);
    outline: none;
    transition: var(--transition-fast);
}

.form-group input[type="text"]:focus,
.form-group select:focus {
    border-color: var(--color-primary);
    background-color: rgba(255, 255, 255, 0.08);
}

/* Toggle Group Buttons (Text vs Image Choice) */
.toggle-group-buttons {
    display: flex;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    background-color: rgba(255, 255, 255, 0.02);
}

.toggle-choice {
    flex: 1;
    background: none;
    border: none;
    padding: 8px 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.toggle-choice:hover {
    color: var(--text-primary);
}

.toggle-choice.active {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Color select with hex label */
.color-select-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 6px 12px;
}

.color-select-wrapper input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    cursor: pointer;
    background: none;
    padding: 0;
}

.color-select-wrapper input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-select-wrapper input[type="color"]::-webkit-color-swatch {
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.color-value {
    font-size: 13px;
    font-family: monospace;
    color: var(--text-primary);
}

/* Range input styling */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    transition: var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

/* Upload & Drop boxes inside dashboard */
.merge-drop-zone, .image-upload-box {
    border: 2px dashed rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 24px 16px;
    text-align: center;
    background-color: rgba(255, 255, 255, 0.02);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    transition: var(--transition-normal);
}

.merge-drop-zone:hover, .image-upload-box:hover,
.merge-drop-zone.drag-over {
    border-color: var(--color-accent);
    background-color: rgba(168, 85, 247, 0.03);
}

.merge-drop-zone i, .image-upload-box i {
    font-size: 24px;
    color: var(--color-accent);
}

.merge-drop-zone p, .image-upload-box span {
    font-size: 12px;
    color: var(--text-secondary);
}

.merge-details, .image-file-info {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.merge-file-info, .image-file-info {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 12px;
    font-weight: 600;
}

.merge-file-info i {
    color: var(--color-accent);
}

.image-file-info i {
    color: var(--color-success);
}

.merge-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
}

.radio-label input[type="radio"] {
    accent-color: var(--color-primary);
}

.btn-danger-outline {
    background: transparent;
    border: 1px solid var(--color-danger);
    color: #fca5a5;
}

.btn-danger-outline:hover:not(:disabled) {
    background: rgba(239, 68, 68, 0.15);
    color: white;
}

.w-100 {
    width: 100%;
}

/* --- THUMBNAIL OVERLAYS (ROTATE & DELETE) --- */
.thumbnail-actions-overlay {
    position: absolute;
    bottom: 6px;
    right: 6px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: 5;
}

.thumbnail-item:hover .thumbnail-actions-overlay {
    opacity: 1;
}

.thumb-action-btn {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    border: none;
    background-color: rgba(17, 24, 39, 0.95);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

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

.thumb-action-btn.delete:hover {
    background-color: var(--color-danger);
}

/* Animations for rotated canvases (visual effect) */
.rotate-90 canvas { transform: rotate(90deg); }
.rotate-180 canvas { transform: rotate(180deg); }
.rotate-270 canvas { transform: rotate(270deg); }