/* ============================================================
   PDF Photo Extractor — Premium Dark Glassmorphism Theme
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- CSS Custom Properties --- */
:root {
    /* Backgrounds */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.65);
    --bg-card-hover: rgba(23, 33, 54, 0.75);
    --bg-glass: rgba(255, 255, 255, 0.04);
    --bg-glass-strong: rgba(255, 255, 255, 0.08);

    /* Accents */
    --accent-teal: #2dd4bf;
    --accent-purple: #a78bfa;
    --accent-blue: #60a5fa;
    --accent-pink: #f472b6;
    --accent-green: #34d399;
    --accent-red: #f87171;
    --accent-amber: #fbbf24;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #2dd4bf, #a78bfa);
    --gradient-secondary: linear-gradient(135deg, #60a5fa, #a78bfa);
    --gradient-warm: linear-gradient(135deg, #f472b6, #fbbf24);
    --gradient-bg: radial-gradient(ellipse at 20% 50%, rgba(45, 212, 191, 0.08) 0%, transparent 50%),
                   radial-gradient(ellipse at 80% 20%, rgba(167, 139, 250, 0.06) 0%, transparent 50%),
                   radial-gradient(ellipse at 50% 80%, rgba(96, 165, 250, 0.04) 0%, transparent 50%);

    /* Text */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* Borders */
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-accent: rgba(45, 212, 191, 0.3);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 14px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.5);
    --shadow-glow-teal: 0 0 30px rgba(45, 212, 191, 0.15);
    --shadow-glow-purple: 0 0 30px rgba(167, 139, 250, 0.15);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Fonts */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Outfit', 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--gradient-bg);
    pointer-events: none;
    z-index: 0;
}

/* --- Layout --- */
.app-wrapper {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* --- Header --- */
.app-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    padding-top: var(--spacing-xl);
}

.app-header__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-glow-teal);
    animation: float 3s ease-in-out infinite;
}

.app-header__icon svg {
    width: 36px;
    height: 36px;
    color: var(--bg-primary);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.app-header__title {
    font-family: var(--font-heading);
    font-size: 2.75rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
}

.app-header__subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
    max-width: 500px;
    margin: 0 auto;
}

/* --- Glass Card --- */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card:hover {
    border-color: var(--border-accent);
}

/* --- Section Headers --- */
.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.section-header__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.section-header__icon--teal {
    background: rgba(45, 212, 191, 0.12);
    color: var(--accent-teal);
}

.section-header__icon--purple {
    background: rgba(167, 139, 250, 0.12);
    color: var(--accent-purple);
}

.section-header__icon--blue {
    background: rgba(96, 165, 250, 0.12);
    color: var(--accent-blue);
}

.section-header__icon--green {
    background: rgba(52, 211, 153, 0.12);
    color: var(--accent-green);
}

.section-header__title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* --- Upload Section --- */
#upload-section {
    margin-bottom: var(--spacing-2xl);
}

.upload-zone {
    position: relative;
    border: 2px dashed rgba(45, 212, 191, 0.25);
    border-radius: var(--radius-lg);
    padding: var(--spacing-3xl) var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at center, rgba(45, 212, 191, 0.03) 0%, transparent 70%);
    transition: opacity var(--transition-normal);
    opacity: 0;
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--accent-teal);
    background: rgba(45, 212, 191, 0.04);
}

.upload-zone:hover::before,
.upload-zone.drag-over::before {
    opacity: 1;
}

.upload-zone.drag-over {
    transform: scale(1.01);
    box-shadow: var(--shadow-glow-teal);
}

.upload-zone__icon {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    background: rgba(45, 212, 191, 0.08);
    margin: 0 auto var(--spacing-lg);
    color: var(--accent-teal);
    transition: transform var(--transition-normal);
}

.upload-zone:hover .upload-zone__icon {
    transform: translateY(-4px);
}

.upload-zone__title {
    position: relative;
    z-index: 1;
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.upload-zone__desc {
    position: relative;
    z-index: 1;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.upload-zone__desc span {
    color: var(--accent-teal);
    font-weight: 500;
}

.upload-options {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.upload-options .input-group {
    flex: 1;
    min-width: 200px;
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-group input[type="text"] {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition-fast);
}

.input-group input[type="text"]:focus {
    border-color: var(--accent-teal);
}

.input-group input[type="text"]::placeholder {
    color: var(--text-muted);
}

.file-selected-info {
    display: none;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(45, 212, 191, 0.06);
    border: 1px solid rgba(45, 212, 191, 0.15);
    border-radius: var(--radius-md);
}

.file-selected-info.show {
    display: flex;
}

.file-selected-info__icon {
    color: var(--accent-teal);
    flex-shrink: 0;
}

.file-selected-info__details {
    flex: 1;
}

.file-selected-info__name {
    font-weight: 600;
    font-size: 0.95rem;
}

.file-selected-info__size {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.file-selected-info__remove {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    transition: color var(--transition-fast);
}

.file-selected-info__remove:hover {
    color: var(--accent-red);
}

/* --- Extract Button --- */
.btn-extract {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--gradient-primary);
    color: var(--bg-primary);
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-glow-teal);
    letter-spacing: 0.02em;
}

.btn-extract:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(45, 212, 191, 0.3);
}

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

.btn-extract:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-extract svg {
    width: 20px;
    height: 20px;
}

/* --- Processing Section --- */
#processing-section {
    display: none;
    margin-bottom: var(--spacing-2xl);
    animation: fadeSlideIn 0.5s ease-out;
}

#processing-section.show {
    display: block;
}

@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    transition: all var(--transition-normal);
}

.stat-card:hover {
    border-color: var(--border-accent);
    background: var(--bg-glass-strong);
}

.stat-card__value {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-card__value--purple {
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    background-clip: text;
}

.stat-card__value--warm {
    background: var(--gradient-warm);
    -webkit-background-clip: text;
    background-clip: text;
}

.stat-card__label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: var(--spacing-xs);
    font-weight: 500;
}

/* Progress Bar */
.progress-container {
    margin-bottom: var(--spacing-lg);
}

.progress-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.progress-label__text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.progress-label__percent {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-teal);
    font-weight: 500;
}

.progress-bar {
    height: 8px;
    background: var(--bg-glass);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.progress-bar__fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    width: 0%;
    transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
}

.progress-bar__fill::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Activity Log */
.activity-log {
    max-height: 300px;
    overflow-y: auto;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.8;
    scrollbar-width: thin;
    scrollbar-color: var(--text-muted) transparent;
}

.activity-log::-webkit-scrollbar {
    width: 6px;
}

.activity-log::-webkit-scrollbar-track {
    background: transparent;
}

.activity-log::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: var(--radius-full);
}

.log-entry {
    padding: 2px 0;
    display: flex;
    gap: var(--spacing-sm);
    animation: logFadeIn 0.3s ease-out;
}

@keyframes logFadeIn {
    from { opacity: 0; transform: translateX(-8px); }
    to { opacity: 1; transform: translateX(0); }
}

.log-entry__time {
    color: var(--text-muted);
    flex-shrink: 0;
}

.log-entry__icon {
    flex-shrink: 0;
    width: 16px;
    text-align: center;
}

.log-entry--info .log-entry__icon { color: var(--accent-blue); }
.log-entry--detail .log-entry__icon { color: var(--text-muted); }
.log-entry--init .log-entry__icon { color: var(--accent-teal); }
.log-entry--page_start .log-entry__icon { color: var(--accent-purple); }
.log-entry--page_done .log-entry__icon { color: var(--accent-green); }
.log-entry--photo_saved .log-entry__icon { color: var(--accent-amber); }
.log-entry--complete .log-entry__icon { color: var(--accent-green); }
.log-entry--error .log-entry__icon { color: var(--accent-red); }

.log-entry__msg {
    color: var(--text-secondary);
    word-break: break-word;
}

/* --- Gallery Section --- */
#gallery-section {
    display: none;
    margin-bottom: var(--spacing-2xl);
    animation: fadeSlideIn 0.5s ease-out;
    /* Remove backdrop-filter: it creates a CSS stacking context that traps
       position:fixed children and prevents floating buttons from working */
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

#gallery-section.show {
    display: block;
}

.gallery-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.gallery-toolbar__rename {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.gallery-toolbar__rename label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 500;
}

.gallery-toolbar__rename input {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.95rem;
    width: 200px;
    max-width: 100%;
    outline: none;
    transition: border-color var(--transition-fast);
}

.gallery-toolbar__rename input:focus {
    border-color: var(--accent-teal);
}

.gallery-toolbar__count {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.gallery-toolbar__count strong {
    color: var(--accent-teal);
    font-weight: 700;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gradient-secondary);
    color: var(--bg-primary);
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-glow-purple);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(167, 139, 250, 0.3);
}

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

/* "Process Another PDF" button */
.btn-new-pdf {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(45, 212, 191, 0.35);
    background: rgba(45, 212, 191, 0.08);
    color: var(--accent-teal);
    font-family: var(--font-primary);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}
.btn-new-pdf svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}
.btn-new-pdf:hover {
    background: rgba(45, 212, 191, 0.16);
    border-color: rgba(45, 212, 191, 0.6);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(45, 212, 191, 0.15);
}

/* Photo Grid */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: var(--spacing-md);
}

.photo-card {
    position: relative;
    aspect-ratio: 3/4;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    transition: all var(--transition-normal);
    background: var(--bg-glass);
}

.photo-card:hover {
    border-color: var(--accent-teal);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow-teal);
}

.photo-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.photo-card:hover img {
    transform: scale(1.05);
}

.photo-card__label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

.photo-card__crop-badge {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 24px;
    height: 24px;
    background: rgba(45, 212, 191, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.photo-card:hover .photo-card__crop-badge {
    opacity: 1;
}

/* --- Crop Modal --- */
.crop-modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease-out;
}

.crop-modal-overlay.show {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.crop-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 700px;
    width: 95%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease-out;
    box-shadow: var(--shadow-lg);
}

@keyframes modalSlideIn {
    from { opacity: 0; transform: scale(0.95) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.crop-modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.crop-modal__title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.crop-modal__close {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.crop-modal__close:hover {
    background: var(--bg-glass-strong);
    color: var(--text-primary);
}

.crop-canvas-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
    min-height: 300px;
}

.crop-canvas-container canvas {
    max-width: 100%;
    max-height: 60vh;
    display: block;
}

.crop-modal__hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.crop-modal__actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-crop-save {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-xl);
    background: var(--gradient-primary);
    color: var(--bg-primary);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-crop-save:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-teal);
}

.btn-crop-reset {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-xl);
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-crop-reset:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
}

.btn-crop-cancel {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-xl);
    background: none;
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-crop-cancel:hover {
    border-color: var(--accent-red);
    color: var(--accent-red);
}

/* --- Status Banner --- */
.status-banner {
    display: none;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    animation: fadeSlideIn 0.3s ease-out;
}

.status-banner.show {
    display: flex;
}

.status-banner--success {
    background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.2);
    color: var(--accent-green);
}

.status-banner--error {
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.2);
    color: var(--accent-red);
}

/* --- Spinner --- */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(45, 212, 191, 0.2);
    border-top-color: var(--accent-teal);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* --- Responsive --- */
@media (max-width: 768px) {
    .app-header__title {
        font-size: 2rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .upload-zone {
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    .gallery-toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .gallery-toolbar__rename {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .gallery-toolbar__rename input {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .app-wrapper {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-sm);
    }

    .stat-card__value {
        font-size: 1.4rem;
    }

    .crop-modal {
        padding: var(--spacing-md);
    }
}

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

/* --- Scrollbar (global) --- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

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

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

/* Page Selection UI */
#selection-section {
    display: none;
}

#selection-section.show {
    display: block;
    animation: fadeIn 0.4s ease forwards;
}

.selection-controls {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-end;
}

.selection-controls .input-group {
    flex: 1;
}

.selection-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 4px;
}

.btn-secondary {
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.2s;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.thumbnail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 16px;
    max-height: 400px;
    overflow-y: auto;
    padding: 4px;
    margin-bottom: 16px;
}

.page-thumb {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-primary);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
}

.page-thumb img {
    width: 100%;
    aspect-ratio: 1 / 1.414;
    object-fit: cover;
    display: block;
    background: #fff;
}

.page-thumb__info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: #000;
    color: #fff;
    padding: 6px 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    backdrop-filter: blur(4px);
}

.page-thumb.selected {
    border-color: var(--accent-teal);
    box-shadow: 0 0 0 2px rgba(45, 212, 191, 0.3);
}

.page-thumb.selected .page-thumb__info {
    background: #000;
    color: #fff;
}

/* ============================================================
   Page Order Verification Modal
   ============================================================ */

.po-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.82);
    backdrop-filter: blur(6px);
    z-index: 2000;
    align-items: flex-start;
    justify-content: center;
    padding: 24px 16px;
    overflow-y: auto;
}
.po-modal-overlay.show {
    display: flex;
}

.po-modal {
    background: linear-gradient(160deg, rgba(17,24,39,0.97), rgba(10,14,26,0.99));
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 18px;
    width: 100%;
    max-width: 960px;
    box-shadow: 0 32px 80px rgba(0,0,0,0.7), 0 0 0 1px rgba(45,212,191,0.08);
    overflow: hidden;
    animation: poSlideIn 0.28s ease;
}

@keyframes poSlideIn {
    from { opacity: 0; transform: translateY(-18px) scale(0.98); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* --- Header --- */
.po-modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px 16px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    background: rgba(255,255,255,0.03);
}
.po-modal__header-left {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--accent-teal);
}
.po-modal__header-left h3 {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}
.po-modal__close {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.po-modal__close:hover {
    background: rgba(248,113,113,0.15);
    border-color: rgba(248,113,113,0.3);
    color: var(--accent-red);
}

/* --- Summary Banner --- */
.po-summary {
    margin: 16px 24px 0;
    border-radius: 10px;
    padding: 12px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}
.po-summary--ok {
    background: rgba(52, 211, 153, 0.12);
    border: 1px solid rgba(52, 211, 153, 0.25);
    color: var(--accent-green);
}
.po-summary--warn {
    background: rgba(251, 191, 36, 0.10);
    border: 1px solid rgba(251, 191, 36, 0.25);
    color: var(--accent-amber);
}
.po-summary--error {
    background: rgba(248, 113, 113, 0.10);
    border: 1px solid rgba(248, 113, 113, 0.25);
    color: var(--accent-red);
}

/* --- Legend --- */
.po-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    padding: 12px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    font-size: 0.78rem;
}
.po-legend.hidden { display: none; }

.po-badge {
    padding: 3px 9px;
    border-radius: 20px;
    font-size: 0.73rem;
    font-weight: 600;
    letter-spacing: 0.01em;
}
.po-badge--duplicate  { background: rgba(248,113,113,0.18); color: var(--accent-red);    border: 1px solid rgba(248,113,113,0.35); }
.po-badge--out-of-order { background: rgba(251,146,60,0.18);  color: #fb923c;             border: 1px solid rgba(251,146,60,0.35); }
.po-badge--gap        { background: rgba(251,191,36,0.15);  color: var(--accent-amber);  border: 1px solid rgba(251,191,36,0.3); }
.po-badge--ok         { background: rgba(52,211,153,0.12);  color: var(--accent-green);  border: 1px solid rgba(52,211,153,0.25); }

.po-legend__hint {
    margin-left: auto;
    color: var(--text-muted);
    font-style: italic;
    font-size: 0.73rem;
}

/* --- Page Grid --- */
.po-page-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    padding: 20px 24px;
    max-height: 55vh;
    overflow-y: auto;
    align-content: flex-start;
}
.po-page-grid::-webkit-scrollbar { width: 6px; }
.po-page-grid::-webkit-scrollbar-track { background: transparent; }
.po-page-grid::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }

/* --- Page Card --- */
.po-page-card {
    position: relative;
    width: 110px;
    border-radius: 10px;
    border: 2px solid rgba(255,255,255,0.07);
    background: rgba(255,255,255,0.03);
    overflow: visible;
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
    cursor: grab;
    user-select: none;
}
.po-page-card:active { cursor: grabbing; }
.po-page-card:hover  { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,0.4); }

.po-page-card.dragging {
    opacity: 0.35;
    transform: scale(0.97);
}
.po-page-card.drag-over {
    border-color: var(--accent-teal) !important;
    box-shadow: 0 0 0 3px rgba(45,212,191,0.3);
}

/* Issue state borders */
.po-page-card--ok         { border-color: rgba(52,211,153,0.25); }
.po-page-card--duplicate  { border-color: var(--accent-red);    box-shadow: 0 0 0 2px rgba(248,113,113,0.25); }
.po-page-card--out-of-order { border-color: #fb923c;              box-shadow: 0 0 0 2px rgba(251,146,60,0.25); }
.po-page-card--gap        { border-color: var(--accent-amber);  box-shadow: 0 0 0 2px rgba(251,191,36,0.2); }
.po-page-card--unread     { border-color: rgba(148,163,184,0.3); }

/* Page thumbnail image */
.po-page-card__img {
    width: 100%;
    height: 142px;
    object-fit: cover;
    display: block;
    border-radius: 8px 8px 0 0;
    pointer-events: none;
}

/* PDF page label (1-indexed) */
.po-page-card__pdf-label {
    position: absolute;
    top: 6px;
    left: 6px;
    background: rgba(0,0,0,0.65);
    color: var(--text-secondary);
    font-size: 0.65rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 4px;
    pointer-events: none;
    backdrop-filter: blur(4px);
}

/* Issue icon overlay (top-right corner) */
.po-page-card__issue-icon {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    pointer-events: none;
}
.po-page-card--duplicate  .po-page-card__issue-icon { background: var(--accent-red);    color: #fff; }
.po-page-card--out-of-order .po-page-card__issue-icon { background: #fb923c;              color: #fff; }

/* Detected page number badge (bottom, editable) */
.po-page-card__num-wrap {
    padding: 6px 6px 7px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
}
.po-page-card__num-label {
    font-size: 0.62rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.po-page-card__num-input {
    width: 100%;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 5px;
    color: var(--text-primary);
    font-size: 0.82rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    text-align: center;
    padding: 4px 2px;
    transition: border-color 0.2s, background 0.2s;
    cursor: text;
}
.po-page-card__num-input:focus {
    outline: none;
    border-color: var(--accent-teal);
    background: rgba(45,212,191,0.08);
}
.po-page-card--duplicate   .po-page-card__num-input { border-color: rgba(248,113,113,0.5); color: var(--accent-red); }
.po-page-card--out-of-order .po-page-card__num-input { border-color: rgba(251,146,60,0.5);  color: #fb923c; }

/* Gap separator card */
.po-gap-card {
    width: 56px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    border-radius: 8px;
    border: 1.5px dashed rgba(251,191,36,0.4);
    background: rgba(251,191,36,0.05);
    padding: 8px 4px;
    pointer-events: none;
    align-self: stretch;
}
.po-gap-card__icon { font-size: 1.1rem; }
.po-gap-card__text {
    font-size: 0.62rem;
    color: var(--accent-amber);
    text-align: center;
    line-height: 1.3;
    font-weight: 600;
}

/* Drag-handle icon */
.po-drag-handle {
    position: absolute;
    bottom: 6px;
    right: 5px;
    color: rgba(255,255,255,0.15);
    pointer-events: none;
    font-size: 0.75rem;
    line-height: 1;
}

/* --- Action buttons --- */
.po-modal__actions {
    display: flex;
    gap: 10px;
    padding: 18px 24px;
    border-top: 1px solid rgba(255,255,255,0.06);
    background: rgba(255,255,255,0.02);
    flex-wrap: wrap;
}

.btn-po-rearrange {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 11px 20px;
    border-radius: 10px;
    border: none;
    background: var(--gradient-primary);
    color: #0a0e1a;
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.15s;
    font-family: inherit;
}
.btn-po-rearrange:hover { opacity: 0.88; transform: translateY(-1px); }

/* --- Floating Actions --- */
.floating-actions {
    display: none;
    position: fixed !important;
    bottom: 30px !important;
    right: 30px !important;
    flex-direction: column;
    gap: 15px;
    z-index: 999999 !important;
    padding: 15px;
    background: rgba(255,255,255,0.95);
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: 0 10px 40px rgba(0,0,0,0.25);
}

.floating-actions.show {
    display: flex;
}

.btn-po-proceed {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 11px 20px;
    border-radius: 10px;
    border: 1px solid rgba(251,191,36,0.35);
    background: rgba(251,191,36,0.1);
    color: var(--accent-amber);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}
.btn-po-proceed:hover { background: rgba(251,191,36,0.18); border-color: rgba(251,191,36,0.5); }

.btn-po-cancel {
    padding: 11px 20px;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.08);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    margin-left: auto;
    font-family: inherit;
}
.btn-po-cancel:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); }

/* Loading spinner overlay inside modal */
.po-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 48px 24px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.po-loading__spinner {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(255,255,255,0.07);
    border-top-color: var(--accent-teal);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.page-thumb:not(.selected) {
    opacity: 0.5;
    filter: grayscale(80%);
    transition: all 0.2s ease-in-out;
}