/* ================================================================
   Document Scanner Web App — Premium Dark UI
   Responsive, glassmorphism, micro-animations
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --bg-glass: rgba(5, 157, 248, 0.04);
    --border-glass: rgba(5, 157, 248, 0.12);
    --accent-primary: #059DF8;
    --accent-secondary: #059DF8;
    --accent-gradient: linear-gradient(135deg, #059DF8 0%, #4fc3f7 100%);
    --accent-glow: rgba(5, 157, 248, 0.15);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 2px 8px rgba(5, 157, 248, 0.04), 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 24px rgba(5, 157, 248, 0.08), 0 2px 4px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 16px 40px rgba(5, 157, 248, 0.12), 0 4px 8px rgba(0, 0, 0, 0.04);
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100dvh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ── App Shell ── */
.scanner-app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    max-width: 100vw;
    overflow: hidden;
    padding-bottom: env(safe-area-inset-bottom);
    background: var(--bg-secondary);
}

/* ── Top Bar ── */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: calc(12px + env(safe-area-inset-top)) calc(16px + env(safe-area-inset-right)) 12px calc(16px + env(safe-area-inset-left));
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 100;
    flex-shrink: 0;
}

.top-bar .logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.1rem;
}

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

.top-bar .logo-icon {
    width: 28px;
    height: 28px;
    background: var(--accent-gradient);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.top-bar .logo-icon svg {
    width: 16px;
    height: 16px;
    fill: white;
}

.top-bar .doc-title {
    font-size: 0.85rem;
    color: var(--text-secondary);
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.step-nav {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-glass);
    flex-shrink: 0;
    scrollbar-width: none; /* Firefox */
}

.step-nav::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.step-nav .step {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
    border: 1px solid transparent;
    white-space: nowrap;
}

.step-nav .step:hover {
    color: var(--text-secondary);
    background: var(--bg-glass);
}

.step-nav .step.active {
    color: white;
    background: var(--accent-gradient);
    border-color: transparent;
    box-shadow: 0 2px 12px var(--accent-glow);
}

.step-nav .step.completed {
    color: var(--success);
}

.step-nav .step-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    flex-shrink: 0;
}

.step-nav .step.active .step-dot {
    background: white;
}

.step-nav .step-line {
    width: 20px;
    height: 1px;
    background: var(--border-glass);
    flex-shrink: 0;
}

/* ── Main Content Area ── */
.main-content {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.screen {
    position: absolute;
    inset: 0;
    display: none;
    flex-direction: column;
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Camera Screen ── */
.camera-viewport {
    flex: 1;
    position: relative;
    background: #000;
    overflow: hidden;
}

.camera-viewport video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.camera-viewport canvas {
    display: none;
}

.camera-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    pointer-events: none;
    padding-top: 40px;
}

.scan-frame {
    width: 80%;
    max-width: 400px;
    aspect-ratio: 3/4;
    border: 2px solid rgba(108, 99, 255, 0.6);
    border-radius: var(--radius-md);
    box-shadow: 0 0 60px rgba(108, 99, 255, 0.15) inset;
    position: relative;
}

.scan-frame::before,
.scan-frame::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 24px;
    border: 3px solid var(--accent-primary);
}

.scan-frame::before {
    top: -2px;
    left: -2px;
    border-right: none;
    border-bottom: none;
    border-top-left-radius: 8px;
}

.scan-frame::after {
    top: -2px;
    right: -2px;
    border-left: none;
    border-bottom: none;
    border-top-right-radius: 8px;
}

.scan-frame .corner-bl,
.scan-frame .corner-br {
    position: absolute;
    width: 24px;
    height: 24px;
    border: 3px solid var(--accent-primary);
}

.scan-frame .corner-bl {
    bottom: -2px;
    left: -2px;
    border-right: none;
    border-top: none;
    border-bottom-left-radius: 8px;
}

.scan-frame .corner-br {
    bottom: -2px;
    right: -2px;
    border-left: none;
    border-top: none;
    border-bottom-right-radius: 8px;
}

.camera-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    padding: 20px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, transparent 100%);
}

.btn-capture {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    border: 4px solid white;
    background: transparent;
    cursor: pointer;
    position: relative;
    transition: var(--transition-fast);
}

.btn-capture::after {
    content: '';
    position: absolute;
    inset: 4px;
    border-radius: 50%;
    background: white;
    transition: var(--transition-fast);
}

.btn-capture:hover::after {
    background: var(--accent-primary);
}

.btn-capture:active {
    transform: scale(0.9);
}

.btn-capture:active::after {
    background: var(--accent-primary);
}

.btn-camera-util {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.btn-camera-util:hover {
    background: rgba(255, 255, 255, 0.25);
}

.btn-camera-util svg {
    width: 22px;
    height: 22px;
}

/* Camera permission overlay */
.camera-permission {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    background: var(--bg-primary);
    z-index: 10;
}

.camera-permission .icon-wrap {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        box-shadow: 0 0 0 0 var(--accent-glow);
    }

    50% {
        box-shadow: 0 0 0 20px transparent;
    }
}

.camera-permission svg {
    width: 36px;
    height: 36px;
    fill: white;
}

.camera-permission h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.camera-permission p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 280px;
}

/* ── Batch / Queue Screen ── */
.batch-area {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}

.batch-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
}

.batch-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 2px solid var(--border-glass);
    background: var(--bg-card);
    cursor: grab;
    transition: var(--transition-fast);
    aspect-ratio: 3/4;
}

.batch-item:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.batch-item.dragging {
    opacity: 0.5;
    border-color: var(--accent-secondary);
}

.batch-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.batch-item .page-num {
    position: absolute;
    top: 6px;
    left: 6px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

.batch-item .btn-delete-page {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--danger);
    border: none;
    color: white;
    font-size: 0.8rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-fast);
}

.batch-item:hover .btn-delete-page {
    opacity: 1;
}

.batch-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 60px 20px;
    color: var(--text-muted);
    text-align: center;
}

.batch-empty svg {
    width: 60px;
    height: 60px;
    opacity: 0.3;
}

/* ── Editor Screen ── */
.editor-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.editor-preview {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    overflow: hidden;
    background: #000;
}

.editor-preview img,
.editor-preview canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.crop-point {
    position: absolute;
    width: 28px;
    height: 28px;
    background: #007bff;
    border: 3px white solid;
    border-radius: 50%;
    cursor: move;
    transform: translate(-50%, -50%);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    z-index: 10;
    transition: background-color 0.1s, transform 0.1s;
}
.crop-point:hover, .crop-point:active {
    background: #0056b3;
    transform: translate(-50%, -50%) scale(1.15);
}

.editor-controls {
    padding: 16px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-glass);
}

.filter-row {
    display: flex;
    gap: 6px;
    width: 100%;
    padding-bottom: 12px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.filter-row::-webkit-scrollbar {
    display: none;
}

.filter-btn {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 6px 4px;
    border: 2px solid var(--border-glass);
    border-radius: var(--radius-md);
    background: var(--bg-glass);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.65rem;
    font-weight: 500;
    white-space: nowrap;
}

.filter-btn:hover,
.filter-btn.active {
    border-color: var(--accent-primary);
    color: var(--text-primary);
    background: rgba(108, 99, 255, 0.1);
}

.filter-btn .preview-box {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    overflow: hidden;
}

.filter-btn .preview-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
}

.slider-row label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    min-width: 70px;
}

.slider-row input[type=range] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--border-glass);
    border-radius: 2px;
    outline: none;
}

.slider-row input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-gradient);
    cursor: pointer;
    box-shadow: 0 2px 8px var(--accent-glow);
}

.slider-row .slider-value {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    min-width: 30px;
    text-align: right;
}

/* ── Page selector in editor ── */
.page-selector {
    display: flex;
    gap: 8px;
    padding: 8px 16px;
    overflow-x: auto;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-glass);
    scrollbar-width: none;
}

.page-selector::-webkit-scrollbar {
    display: none;
}

.page-thumb {
    position: relative;
    flex-shrink: 0;
    width: 48px;
    height: 64px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-glass);
    overflow: visible;
    cursor: pointer;
    transition: var(--transition-fast);
    opacity: 0.6;
}

.page-thumb.active {
    border-color: var(--accent-primary);
    opacity: 1;
    box-shadow: 0 0 12px var(--accent-glow);
}

.page-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: calc(var(--radius-sm) - 1px);
}

.page-thumb-delete {
    position: absolute;
    top: -5px;
    right: -5px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #ef4444;
    color: white;
    border: 1.5px solid var(--bg-primary);
    font-size: 10px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    transition: background 0.2s, transform 0.2s, opacity 0.2s;
    opacity: 1;
    z-index: 10;
    line-height: 1;
    padding: 0;
}

.page-thumb:hover .page-thumb-delete,
.page-thumb-delete:hover {
    transform: scale(1.15);
}

.page-thumb-delete:hover {
    background: #dc2626;
}

/* Touch/mobile devices: show delete buttons since hover won't work */
@media (max-width: 768px) {
    .page-thumb-delete {
        opacity: 1;
        top: -3px;
        right: -3px;
        width: 16px;
        height: 16px;
        font-size: 8px;
    }
}

/* ── Premium SortableJS Drag & Drop Animations ── */
.sortable-ghost {
    opacity: 0.25 !important;
    background: rgba(5, 157, 248, 0.08) !important;
    border: 2px dashed var(--accent-primary) !important;
    transform: scale(0.95);
    box-shadow: none !important;
}

.sortable-chosen {
    transform: scale(1.04);
    box-shadow: var(--shadow-lg) !important;
    border-color: var(--accent-primary) !important;
    transition: transform 0.15s ease;
}

.sortable-drag {
    opacity: 0.95 !important;
    transform: rotate(2deg) scale(1.06) !important;
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.15) !important;
    z-index: 99999 !important;
    cursor: grabbing !important;
    pointer-events: none;
}

/* ── Export Screen ── */
.export-area {
    flex: 1;
    overflow-y: auto;
    padding: 20px 16px;
}

.export-card {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 12px;
    backdrop-filter: blur(20px);
    transition: var(--transition-fast);
    cursor: pointer;
}

.export-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.export-card .card-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.export-card .card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.export-card .card-icon svg {
    width: 22px;
    height: 22px;
}

.export-card .card-icon.pdf {
    background: linear-gradient(135deg, #ff5252, #ff1744);
}

.export-card .card-icon.pdf svg {
    fill: white;
}

.export-card .card-icon.jpg {
    background: linear-gradient(135deg, #ffab40, #ff9100);
}

.export-card .card-icon.jpg svg {
    fill: white;
}

.export-card .card-icon.png {
    background: linear-gradient(135deg, #00e676, #00c853);
}

.export-card .card-icon.png svg {
    fill: white;
}

.export-card .card-icon.email {
    background: linear-gradient(135deg, #6c63ff, #00d2ff);
}

.export-card .card-icon.email svg {
    fill: white;
}

.export-card .card-icon.share {
    background: linear-gradient(135deg, #e040fb, #7c4dff);
}

.export-card .card-icon.share svg {
    fill: white;
}

.export-card h4 {
    font-size: 0.95rem;
    font-weight: 600;
}

.export-card p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Email form */
.email-form {
    display: none;
    padding: 16px 0 0;
    animation: fadeIn 0.3s ease;
}

.email-form.show {
    display: block;
}

.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-glass);
    background: var(--bg-glass);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    outline: none;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* ── Bottom Action Bar ── */
.bottom-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-glass);
    gap: 8px;
    flex-shrink: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: var(--radius-xl);
    border: none;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 24px var(--accent-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--text-muted);
}

.btn-success {
    background: linear-gradient(135deg, #00e676, #00c853);
    color: white;
}

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

.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 50%;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.75rem;
}

.btn-sm svg {
    width: 14px;
    height: 14px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ── Badge counter ── */
.badge-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    border-radius: 10px;
    background: var(--accent-primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
}

/* ── Toast notifications ── */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-md);
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(20px);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 500;
    animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.5s forwards;
    max-width: 320px;
    box-shadow: var(--shadow-lg);
}

.toast.success {
    border-left: 3px solid var(--success);
}

.toast.error {
    border-left: 3px solid var(--danger);
}

.toast.info {
    border-left: 3px solid var(--accent-primary);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateY(-10px);
    }
}

/* ── Loading spinner ── */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-glass);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.85);
    z-index: 9999;
    backdrop-filter: blur(8px);
    flex-direction: column;
    gap: 16px;
}

.loading-overlay.show {
    display: flex;
}

.loading-overlay p {
    color: var(--text-primary);
    font-size: 0.85rem;
}

/* ── Responsive ── */
@media (max-width: 480px) {
    .step-nav .step {
        padding: 4px 8px;
        gap: 4px;
        font-size: 0.65rem;
    }

    .step-nav .step-line {
        width: 10px;
    }

    .top-bar {
        padding: calc(8px + env(safe-area-inset-top)) calc(12px + env(safe-area-inset-right)) 8px calc(12px + env(safe-area-inset-left));
    }

    .btn {
        padding: 8px 16px;
        font-size: 0.8rem;
    }

    .batch-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 8px;
    }
}

@media (min-width: 768px) {
    .batch-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }

    .scan-frame {
        max-width: 280px;
    }
}

@media (min-width: 1024px) {
    .scanner-app {
        max-width: 500px;
        margin: 0 auto;
        box-shadow: var(--shadow-lg);
    }

    body {
        display: flex;
        align-items: center;
        justify-content: center;
        background: #f1f5f9;
    }
}

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

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

.gap-8 {
    gap: 8px;
}

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.w-full {
    width: 100%;
}

.mt-12 {
    margin-top: 12px;
}

/* ── Custom Confirm Dialog ── */
.confirm-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.3);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 20000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.confirm-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 24px;
    width: 90%;
    max-width: 380px;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.confirm-message {
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 20px;
    line-height: 1.5;
    text-align: center;
}

.confirm-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.confirm-buttons .btn {
    flex: 1;
    padding: 10px 16px;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* ── Tool Selection Screen (Screen 0) ── */
.tools-intro {
    text-align: center;
    padding: 24px 16px 12px;
}

.tools-intro h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 6px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tools-intro p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.tools-grid {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 500px;
    margin: 0 auto;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition-fast);
    cursor: pointer;
}

.tool-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tool-card .tool-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.tool-card .tool-icon svg {
    width: 26px;
    height: 26px;
    fill: white;
}

.tool-card .tool-icon.image-to-pdf {
    background: linear-gradient(135deg, #4caf50, #2e7d32);
}

.tool-card .tool-icon.pdf-to-jpg {
    background: linear-gradient(135deg, #ff9800, #e65100);
}

.tool-card .tool-icon.merge-pdf {
    background: linear-gradient(135deg, #00b0ff, #007bb6);
}

.tool-card .tool-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.tool-card .tool-info p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ── Input Selection Screen ── */
.input-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-glass);
}

.input-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.input-container {
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 260px;
}

.input-context {
    width: 100%;
    max-width: 440px;
}

.input-options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    width: 100%;
}

.input-opt-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
}

.input-opt-btn:hover {
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-2px);
}

.input-opt-btn .opt-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.input-opt-btn .opt-icon svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

.input-opt-btn .opt-icon.camera {
    background: rgba(76, 175, 80, 0.15);
    color: #4caf50;
}

.input-opt-btn .opt-icon.upload {
    background: rgba(0, 176, 255, 0.15);
    color: #00b0ff;
}

/* Dropzone */
.upload-dropzone {
    border: 2px dashed var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 36px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
    background: rgba(255, 255, 255, 0.01);
    width: 100%;
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.04);
}

.dropzone-icon-wrap {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    transition: var(--transition-fast);
}

.upload-dropzone:hover .dropzone-icon-wrap {
    transform: scale(1.1);
    background: rgba(108, 99, 255, 0.15);
}

.upload-dropzone:hover .dropzone-icon {
    fill: var(--accent-primary);
}

.dropzone-icon {
    width: 30px;
    height: 30px;
    fill: var(--text-secondary);
    transition: var(--transition-fast);
}

.dropzone-text {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.dropzone-subtext {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ── Merge PDF File List ── */
.merge-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    max-width: 440px;
    margin: 0 auto;
}

.merge-item {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: grab;
    transition: var(--transition-fast);
}

.merge-item:active {
    cursor: grabbing;
}

.merge-item.sortable-placeholder {
    border: 1px dashed var(--accent-primary);
    background: rgba(108, 99, 255, 0.05);
    visibility: visible !important;
    height: 60px;
}

.merge-drag-handle {
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    cursor: grab;
}

.merge-drag-handle svg {
    width: 18px;
    height: 18px;
}

.merge-file-icon {
    color: #e53935;
    display: flex;
    align-items: center;
}

.merge-file-icon svg {
    width: 24px;
    height: 24px;
}

.merge-file-details {
    flex: 1;
    min-width: 0;
}

.merge-file-name {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.merge-file-meta {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.btn-delete-file {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    transition: var(--transition-fast);
}

.btn-delete-file:hover {
    color: #ff5252;
    transform: scale(1.1);
}

.btn-delete-file svg {
    width: 18px;
    height: 18px;
}

/* Step navigation icons styling */
.step-nav .step-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.step-nav .step-icon svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
    transition: var(--transition-fast);
}

/* ── Selected Images Grid inside screenInput ── */
.input-images-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    width: 100%;
}

.input-image-item {
    position: relative;
    aspect-ratio: 1 / 1;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.input-image-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.input-image-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.input-image-item .btn-remove-input-image {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: bold;
    cursor: pointer;
    backdrop-filter: blur(4px);
    transition: background 0.2s ease, transform 0.2s ease;
    z-index: 10;
}

.input-image-item .btn-remove-input-image:hover {
    background: #ff4d4d;
    transform: scale(1.1);
}

.input-image-item.dragging {
    opacity: 0.5;
    border-color: var(--accent-secondary);
}