/* ===== CSS Variables & Reset ===== */
:root {
    --primary: #6C63FF;
    --primary-dark: #5A52D5;
    --primary-light: #8B83FF;
    --primary-bg: rgba(108, 99, 255, 0.08);
    --primary-bg-hover: rgba(108, 99, 255, 0.15);
    
    --danger: #EF4444;
    --danger-dark: #DC2626;
    --success: #10B981;
    --warning: #F59E0B;
    --info: #3B82F6;
    
    --bg-primary: #0F0F1A;
    --bg-secondary: #1A1A2E;
    --bg-tertiary: #232340;
    --bg-card: #1E1E36;
    --bg-elevated: #2A2A4A;
    
    --text-primary: #F0F0F5;
    --text-secondary: #9CA3AF;
    --text-tertiary: #6B7280;
    
    --border: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.12);
    
    --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 30px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.6);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    --header-height: 60px;
    --stats-height: 36px;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
    
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #F5F5FA;
        --bg-secondary: #FFFFFF;
        --bg-tertiary: #F0F0F5;
        --bg-card: #FFFFFF;
        --bg-elevated: #FFFFFF;
        
        --text-primary: #1A1A2E;
        --text-secondary: #6B7280;
        --text-tertiary: #9CA3AF;
        
        --border: rgba(0, 0, 0, 0.08);
        --border-light: rgba(0, 0, 0, 0.12);
        
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
        --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.1);
        --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
        --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
    }
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overscroll-behavior: none;
}

.hidden {
    display: none !important;
}

.hidden-input {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

/* ===== Splash Screen ===== */
.splash-screen {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.splash-screen.fade-out {
    opacity: 0;
    visibility: hidden;
}

.splash-content {
    text-align: center;
    animation: splash-in 0.6s ease-out;
}

.splash-icon svg {
    width: 80px;
    height: 80px;
    filter: drop-shadow(0 4px 20px rgba(108, 99, 255, 0.3));
}

.splash-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 16px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.splash-loader {
    width: 40px;
    height: 3px;
    margin: 20px auto 0;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.splash-loader::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--primary);
    border-radius: 3px;
    animation: splash-loading 1s ease-in-out infinite;
}

@keyframes splash-in {
    from { opacity: 0; transform: scale(0.9) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes splash-loading {
    0% { transform: translateX(-100%); }
    50% { transform: translateX(0); }
    100% { transform: translateX(100%); }
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding-top: var(--safe-top);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.header-content {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    padding-left: calc(16px + var(--safe-left));
    padding-right: calc(16px + var(--safe-right));
}

.header-title {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.02em;
}

.header-logo {
    width: 24px;
    height: 24px;
    color: var(--primary);
}

.header-actions {
    display: flex;
    gap: 4px;
}

/* ===== Selection Bar ===== */
.selection-bar {
    background: var(--primary);
    overflow: hidden;
    animation: slideDown var(--transition-normal) ease;
}

.selection-bar-content {
    height: 48px;
    display: flex;
    align-items: center;
    padding: 0 8px;
    padding-left: calc(8px + var(--safe-left));
    padding-right: calc(8px + var(--safe-right));
    gap: 8px;
}

.selection-bar .icon-btn {
    color: white;
}

.selection-count {
    flex: 1;
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
}

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

@keyframes slideDown {
    from { max-height: 0; opacity: 0; }
    to { max-height: 48px; opacity: 1; }
}

/* ===== Stats Bar ===== */
.stats-bar {
    height: var(--stats-height);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 16px;
    padding-left: calc(16px + var(--safe-left));
    padding-right: calc(16px + var(--safe-right));
    font-size: 0.75rem;
    color: var(--text-tertiary);
    border-top: 1px solid var(--border);
}

.stats-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.sync-status {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 6px;
}

.sync-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--warning);
}

.sync-dot.synced { background: var(--success); }
.sync-dot.syncing { background: var(--info); animation: pulse 1s infinite; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ===== Icon Button ===== */
.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.icon-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: currentColor;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.icon-btn:hover::before { opacity: 0.08; }
.icon-btn:active::before { opacity: 0.15; }

.icon-btn svg {
    width: 20px;
    height: 20px;
    position: relative;
    z-index: 1;
}

.icon-btn.light { color: white; }
.icon-btn.danger { color: var(--danger); }
.icon-btn.small { width: 32px; height: 32px; }
.icon-btn.small svg { width: 16px; height: 16px; }

/* ===== Main Content ===== */
.main-content {
    padding-top: calc(var(--safe-top) + var(--header-height) + var(--stats-height));
    padding-bottom: calc(100px + var(--safe-bottom));
    padding-left: var(--safe-left);
    padding-right: var(--safe-right);
    min-height: 100vh;
    min-height: 100dvh;
    position: relative;
}

.main-content.has-selection {
    padding-top: calc(var(--safe-top) + var(--header-height) + var(--stats-height) + 48px);
}

/* ===== Empty State ===== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 32px;
    text-align: center;
    min-height: 60vh;
    min-height: 60dvh;
    animation: fadeInUp var(--transition-slow) ease;
}

.empty-illustration svg {
    width: 160px;
    height: 160px;
    margin-bottom: 24px;
}

.empty-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    max-width: 280px;
    line-height: 1.6;
}

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

/* ===== Image Grid ===== */
.image-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    padding: 2px;
}

@media (min-width: 600px) {
    .image-grid { grid-template-columns: repeat(4, 1fr); gap: 4px; padding: 4px; }
}

@media (min-width: 900px) {
    .image-grid { grid-template-columns: repeat(5, 1fr); gap: 4px; padding: 8px; }
}

@media (min-width: 1200px) {
    .image-grid { grid-template-columns: repeat(6, 1fr); gap: 6px; padding: 12px; }
}

.grid-item {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    cursor: pointer;
    border-radius: 2px;
    background: var(--bg-tertiary);
    transition: transform var(--transition-fast);
}

@media (min-width: 600px) {
    .grid-item { border-radius: var(--radius-sm); }
}

.grid-item:active {
    transform: scale(0.97);
}

.grid-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity var(--transition-normal);
}

.grid-item img.loading {
    opacity: 0;
}

.grid-item img.loaded {
    opacity: 1;
}

.grid-item-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0);
    transition: background var(--transition-fast);
    display: flex;
    align-items: flex-end;
    padding: 8px;
}

.grid-item:hover .grid-item-overlay {
    background: rgba(0, 0, 0, 0.1);
}

.grid-item.selected .grid-item-overlay {
    background: rgba(108, 99, 255, 0.3);
}

.grid-item-check {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid white;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.8);
    transition: all var(--transition-fast);
}

.selecting .grid-item-check,
.grid-item:hover .grid-item-check {
    opacity: 1;
    transform: scale(1);
}

.grid-item.selected .grid-item-check {
    background: var(--primary);
    border-color: var(--primary);
    opacity: 1;
    transform: scale(1);
}

.grid-item-check svg {
    width: 14px;
    height: 14px;
    color: white;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.grid-item.selected .grid-item-check svg {
    opacity: 1;
}

.grid-item-status {
    position: absolute;
    bottom: 6px;
    left: 6px;
    display: flex;
    gap: 4px;
}

.status-badge {
    padding: 2px 6px;
    border-radius: var(--radius-full);
    font-size: 0.625rem;
    font-weight: 600;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    backdrop-filter: blur(4px);
}

.status-badge.pending { color: var(--warning); }
.status-badge.uploaded { color: var(--success); }
.status-badge.error { color: var(--danger); }

/* ===== Image List ===== */
.image-list {
    padding: 8px;
}

.list-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
    position: relative;
}

.list-item:hover {
    background: var(--primary-bg);
}

.list-item:active {
    background: var(--primary-bg-hover);
}

.list-item.selected {
    background: var(--primary-bg-hover);
}

.list-item-thumb {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    flex-shrink: 0;
    background: var(--bg-tertiary);
}

.list-item-info {
    flex: 1;
    min-width: 0;
}

.list-item-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.list-item-meta {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 2px;
    display: flex;
    gap: 8px;
}

.list-item-check {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
    opacity: 0;
}

.selecting .list-item-check {
    opacity: 1;
}

.list-item.selected .list-item-check {
    background: var(--primary);
    border-color: var(--primary);
    opacity: 1;
}

.list-item-check svg {
    width: 14px;
    height: 14px;
    color: white;
    opacity: 0;
}

.list-item.selected .list-item-check svg {
    opacity: 1;
}

.list-item-actions {
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.list-item:hover .list-item-actions {
    opacity: 1;
}

/* ===== FAB ===== */
.fab-container {
    position: fixed;
    bottom: calc(24px + var(--safe-bottom));
    right: calc(24px + var(--safe-right));
    z-index: 90;
}

.fab-main {
    width: 56px;
    height: 56px;
    border: none;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg), 0 0 40px rgba(108, 99, 255, 0.3);
    transition: all var(--transition-normal);
    position: relative;
    z-index: 3;
}

.fab-main:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
    box-shadow: var(--shadow-xl), 0 0 50px rgba(108, 99, 255, 0.4);
}

.fab-main:active {
    transform: scale(0.95);
}

.fab-main.active {
    transform: rotate(45deg);
    background: var(--bg-elevated);
}

.fab-main svg {
    width: 24px;
    height: 24px;
    transition: transform var(--transition-normal);
}

.fab-menu {
    position: absolute;
    bottom: 68px;
    right: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 2;
}

.fab-menu.visible {
    display: flex;
}

.fab-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-direction: row-reverse;
    border: none;
    background: transparent;
    cursor: pointer;
    animation: fabItemIn var(--transition-spring) both;
    white-space: nowrap;
}

.fab-menu-item:nth-child(1) { animation-delay: 50ms; }
.fab-menu-item:nth-child(2) { animation-delay: 100ms; }
.fab-menu-item:nth-child(3) { animation-delay: 150ms; }

@keyframes fabItemIn {
    from { opacity: 0; transform: translateY(20px) scale(0.8); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.fab-menu-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-elevated);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
}

.fab-menu-item:hover .fab-menu-icon {
    background: var(--primary);
    color: white;
    transform: scale(1.1);
}

.fab-menu-icon svg {
    width: 22px;
    height: 22px;
}

.fab-menu-label {
    padding: 6px 14px;
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.fab-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
    animation: fadeIn var(--transition-fast) ease;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

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

/* ===== Drop Zone ===== */
.drop-zone {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(108, 99, 255, 0.1);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn var(--transition-fast) ease;
}

.drop-zone-content {
    text-align: center;
    color: var(--primary);
    padding: 40px;
    border: 3px dashed var(--primary);
    border-radius: var(--radius-xl);
    animation: dropBounce 0.5s ease;
}

.drop-zone-content svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
}

.drop-zone-content p {
    font-size: 1.1rem;
    font-weight: 600;
}

@keyframes dropBounce {
    0% { transform: scale(0.8); opacity: 0; }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); opacity: 1; }
}

/* ===== Image Viewer ===== */
.image-viewer {
    position: fixed;
    inset: 0;
    z-index: 500;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    animation: viewerIn var(--transition-normal) ease;
}

@keyframes viewerIn {
    from { opacity: 0; transform: scale(1.02); }
    to { opacity: 1; transform: scale(1); }
}

.viewer-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
    padding-top: calc(8px + var(--safe-top));
    padding-left: calc(8px + var(--safe-left));
    padding-right: calc(8px + var(--safe-right));
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
    position: relative;
    z-index: 2;
}

.viewer-title {
    flex: 1;
    min-width: 0;
}

.viewer-filename {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.viewer-date {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
}

.viewer-actions {
    display: flex;
    gap: 2px;
}

.viewer-body {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    touch-action: pinch-zoom pan-x pan-y;
}

.viewer-image-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.viewer-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    user-select: none;
    -webkit-user-select: none;
    transition: opacity var(--transition-normal);
}

.viewer-loading {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.viewer-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.4);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.viewer-nav:hover {
    background: rgba(0, 0, 0, 0.6);
    transform: translateY(-50%) scale(1.1);
}

.viewer-nav.prev { left: 12px; }
.viewer-nav.next { right: 12px; }

.viewer-nav svg {
    width: 24px;
    height: 24px;
}

@media (max-width: 600px) {
    .viewer-nav {
        width: 36px;
        height: 36px;
        opacity: 0.6;
    }
    .viewer-nav.prev { left: 4px; }
    .viewer-nav.next { right: 4px; }
    .viewer-nav svg { width: 20px; height: 20px; }
}

.viewer-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    padding-bottom: calc(12px + var(--safe-bottom));
    padding-left: calc(16px + var(--safe-left));
    padding-right: calc(16px + var(--safe-right));
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
    position: relative;
    z-index: 2;
}

.viewer-counter {
    font-weight: 600;
    color: rgba(255, 255, 255, 0.8);
}

/* ===== Toast ===== */
.toast-container {
    position: fixed;
    bottom: calc(90px + var(--safe-bottom));
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
    pointer-events: none;
    width: 90%;
    max-width: 400px;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-md);
    background: var(--bg-elevated);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    pointer-events: auto;
    animation: toastIn var(--transition-spring) both;
    width: 100%;
    border: 1px solid var(--border-light);
}

.toast.removing {
    animation: toastOut var(--transition-normal) both;
}

.toast-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.toast.success .toast-icon { color: var(--success); }
.toast.error .toast-icon { color: var(--danger); }
.toast.info .toast-icon { color: var(--info); }
.toast.warning .toast-icon { color: var(--warning); }

@keyframes toastIn {
    from { opacity: 0; transform: translateY(20px) scale(0.9); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateY(0) scale(1); }
    to { opacity: 0; transform: translateY(-20px) scale(0.9); }
}

/* ===== Upload Progress ===== */
.upload-progress {
    position: fixed;
    bottom: calc(90px + var(--safe-bottom));
    left: 16px;
    right: 16px;
    left: calc(16px + var(--safe-left));
    right: calc(16px + var(--safe-right));
    z-index: 150;
    animation: slideUp var(--transition-normal) ease;
}

.upload-progress-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    padding: 16px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
}

.upload-progress-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.upload-progress-bar-container {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.upload-progress-bar {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    transition: width var(--transition-normal);
    width: 0%;
}

.upload-progress-text {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 8px;
    text-align: center;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(100%); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Dialog ===== */
.dialog-overlay {
    position: fixed;
    inset: 0;
    z-index: 600;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    animation: fadeIn var(--transition-fast) ease;
    backdrop-filter: blur(4px);
}

.dialog-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: 32px 24px 24px;
    max-width: 340px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-xl);
    animation: dialogIn var(--transition-spring) both;
}

@keyframes dialogIn {
    from { opacity: 0; transform: scale(0.85) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.dialog-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dialog-icon.danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.dialog-icon.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.dialog-icon svg {
    width: 28px;
    height: 28px;
}

.dialog-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.dialog-message {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.dialog-actions {
    display: flex;
    gap: 10px;
}

.dialog-btn {
    flex: 1;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.dialog-btn.secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.dialog-btn.secondary:hover {
    background: var(--border-light);
}

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

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

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

.dialog-btn.primary.danger:hover {
    background: var(--danger-dark);
}

/* ===== Spinner ===== */
.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ===== Skeleton Loading ===== */
.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-elevated) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 3px;
}

/* ===== Mobile Optimizations ===== */
@media (hover: none) {
    .grid-item-check {
        opacity: 0;
    }
    
    .selecting .grid-item-check {
        opacity: 1;
    }
    
    .list-item-actions {
        opacity: 1;
    }
    
    .viewer-nav {
        opacity: 0.7;
    }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ===== Desktop Large Screen ===== */
@media (min-width: 1024px) {
    .main-content {
        max-width: 1400px;
        margin: 0 auto;
    }
    
    .fab-container {
        bottom: 40px;
        right: 40px;
    }
}