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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1f1f1f;
    --bg-hover: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #888888;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.2);
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.12);
    --success: #10b981;
    --error: #ef4444;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --header-height: 60px;
    --sidebar-width: 320px;
    --upload-area-height: 100px;
    --safe-area-inset-top: env(safe-area-inset-top, 0px);
    --safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-inset-left: env(safe-area-inset-left, 0px);
    --safe-area-inset-right: env(safe-area-inset-right, 0px);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding-top: var(--safe-area-inset-top);
    position: fixed;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

@media (max-width: 768px) {
    body.sidebar-open {
        overflow: hidden;
    }
}

/* iOS prevent zoom-on-focus */
input, textarea, select {
    font-size: 16px;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.header {
    position: fixed;
    top: var(--safe-area-inset-top);
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(20, 20, 20, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    transition: var(--transition);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: 0 var(--spacing-md);
    padding-left: calc(var(--safe-area-inset-left) + var(--spacing-md));
    padding-right: calc(var(--safe-area-inset-right) + var(--spacing-md));
    height: 100%;
    max-width: 100%;
}

@media (max-width: 1024px) {
    .header-content {
        padding-left: calc(56px + var(--safe-area-inset-left) + var(--spacing-sm));
    }
}

.upload-token-wrapper {
    flex: 1;
    max-width: 400px;
    min-width: 0;
}

.upload-token-input {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    transition: var(--transition);
    height: 36px;
}

.upload-token-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.upload-token-input::placeholder {
    color: var(--text-secondary);
}

.language-switcher {
    position: fixed;
    top: calc(var(--safe-area-inset-top) + var(--spacing-sm));
    right: calc(var(--safe-area-inset-right) + var(--spacing-sm));
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 110;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    padding: 0;
    font-family: inherit;
    font-weight: normal;
    box-shadow: none;
}

.language-switcher:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    transform: scale(1.05);
}

.language-switcher:active {
    transform: scale(0.95);
}

.upload-area-container {
    position: fixed;
    bottom: var(--safe-area-inset-bottom);
    left: var(--sidebar-width);
    right: 0;
    background: rgba(20, 20, 20, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    padding: var(--spacing-md);
    z-index: 50;
    transition: left 0.3s ease;
    min-height: var(--upload-area-height);
}

.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    background: var(--bg-tertiary);
    position: relative;
    overflow: hidden;
    max-width: 1400px;
    margin: 0 auto;
    min-height: 60px;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.upload-area.drag-over {
    border-color: var(--accent);
    background: var(--bg-hover);
}

.upload-area.drag-over::before {
    opacity: 1;
}

.upload-area p {
    color: var(--text-secondary);
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    margin: 0;
}

.upload-area-icon {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: var(--spacing-sm);
    opacity: 0.5;
}

.upload-input {
    display: none;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    position: fixed;
    left: 0;
    top: calc(var(--header-height) + var(--safe-area-inset-top));
    bottom: 0;
    z-index: 80;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-content {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-md);
    padding-bottom: calc(80px + var(--spacing-lg) + var(--safe-area-inset-bottom));
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
    -webkit-overflow-scrolling: touch;
    scroll-padding-bottom: 80px;
}

.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: calc(var(--safe-area-inset-top) + var(--spacing-sm));
    left: calc(var(--safe-area-inset-left) + var(--spacing-sm));
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    z-index: 110;
    box-shadow: none;
    transition: var(--transition);
    align-items: center;
    justify-content: center;
    line-height: 1;
    padding: 0;
    font-family: inherit;
    font-weight: normal;
}

.mobile-menu-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    transform: scale(1.05);
}

.mobile-menu-toggle:active {
    transform: scale(0.95);
}

.section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    padding: 0 var(--spacing-sm);
}

.no-album-tile {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-height: 48px;
}

.no-album-tile:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    transform: translateX(4px);
}

.no-album-tile.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.albums-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.album-tile {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    aspect-ratio: 1;
}

.album-tile:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-hover);
}

.album-tile.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent);
}

.album-tile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: var(--bg-hover);
    transition: opacity 0.3s ease;
    opacity: 1;
}

.album-tile-image[data-lazy-src] {
    opacity: 0.7;
}

.album-tile-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-sm);
    background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, transparent 100%);
}

.album-tile-name {
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.lock-icon {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

.album-delete-btn {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    width: 32px;
    height: 32px;
    background: rgba(239, 68, 68, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 2;
}

.album-tile:hover .album-delete-btn {
    opacity: 1;
}

.album-delete-btn:hover {
    transform: scale(1.1);
    background: rgba(220, 38, 38, 0.9);
}

.add-album-btn {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    margin: 0;
    padding: var(--spacing-md) var(--spacing-lg);
    padding-bottom: calc(var(--spacing-md) + var(--safe-area-inset-bottom));
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    cursor: pointer;
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    font-weight: 500;
    transition: var(--transition);
    text-align: center;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
    min-height: 56px;
    z-index: 1;
    flex-shrink: 0;
}

.add-album-btn:hover {
    background: var(--accent-hover);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    position: relative;
    overflow-y: auto;
    overflow-x: hidden;
    height: 100vh;
    padding-top: calc(var(--header-height) + var(--safe-area-inset-top));
    padding-bottom: calc(var(--upload-area-height) + var(--spacing-xl));
}

.main-content-inner {
    padding: var(--spacing-lg);
    padding-bottom: calc(var(--upload-area-height) + var(--spacing-xl) * 2 + var(--safe-area-inset-bottom));
    min-height: 100%;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
    animation: fadeIn 0.5s ease;
}

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

@keyframes fadeInScale {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.viewer-modal .viewer-content img,
.viewer-modal .viewer-content video {
    animation: fadeInScale 0.3s ease;
}

.gallery-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
}

.gallery-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-hover);
}

.gallery-item-preview {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--bg-tertiary);
    display: block;
    flex-shrink: 0;
    box-sizing: border-box;
    transition: opacity 0.3s ease;
    opacity: 1;
}

.gallery-item-preview[data-lazy-src] {
    opacity: 0.7;
}

.gallery-item-info {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border);
    box-sizing: border-box;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: stretch;
}

.gallery-item-name {
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 500;
    width: 100%;
    text-align: left;
}

.gallery-item-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    width: 100%;
    box-sizing: border-box;
    justify-content: center;
    align-items: stretch;
}

.action-btn {
    flex: 1 1 33.33%;
    min-width: 0;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    box-sizing: border-box;
    margin: 0;
}

.action-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    transform: scale(1.05);
}

.action-btn:active {
    transform: scale(0.95);
}

.action-btn.delete-btn:hover {
    background: var(--error);
    border-color: var(--error);
}

.action-btn svg {
    width: 20px;
    height: 20px;
    stroke-width: 2;
    flex-shrink: 0;
}

.modal {
    display: none !important;
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
    padding: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.modal.show {
    display: flex !important;
    align-items: center;
    justify-content: center;
}

.modal:not(.viewer-modal) {
    padding: var(--spacing-md);
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: var(--spacing-xl);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideIn 0.3s ease;
    margin: auto;
}

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

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
    transform: scale(1.05);
}

.modal h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    font-size: clamp(1.125rem, 3vw, 1.25rem);
    font-weight: 600;
    padding-right: var(--spacing-lg);
    word-wrap: break-word;
}

.modal-field {
    margin-bottom: var(--spacing-lg);
    width: 100%;
    box-sizing: border-box;
}

.modal-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    font-weight: 500;
}

.modal input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    font-size: clamp(0.875rem, 2vw, 1rem);
    transition: var(--transition);
    min-height: 44px;
}

.modal input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.modal input::placeholder {
    color: var(--text-secondary);
}

.modal-checkbox-field {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: var(--spacing-lg);
    width: 100%;
    box-sizing: border-box;
}

.modal-checkbox {
    -webkit-appearance: checkbox;
    appearance: checkbox;
    width: 20px;
    height: 20px;
    min-width: 20px;
    max-width: 20px;
    margin: 2px 0 0 0;
    padding: 0;
    cursor: pointer;
    accent-color: var(--accent);
    flex-shrink: 0;
    flex-grow: 0;
}

.modal-checkbox-wrapper {
    flex: 1;
    min-width: 0;
    overflow: visible;
}

.modal-checkbox-label {
    color: var(--text-primary);
    font-size: clamp(0.875rem, 2vw, 1rem);
    user-select: none;
    line-height: 1.5;
    cursor: pointer;
    display: block;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.modal-hint {
    font-size: clamp(0.75rem, 2vw, 0.8125rem);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
    line-height: 1.4;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

.modal button {
    flex: 1;
    min-width: 120px;
    background: var(--accent);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    font-weight: 500;
    transition: var(--transition);
    min-height: 44px;
}

.modal button:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.modal button.secondary:hover {
    background: var(--bg-hover);
}

.modal button.danger {
    background: var(--error);
}

.modal button.danger:hover {
    background: #dc2626;
}

.viewer-modal {
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    overflow: auto;
    position: fixed !important;
}

.viewer-modal .modal-content {
    max-width: 100%;
    max-height: 100%;
    padding: 0;
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    cursor: default;
    overflow: visible;
    margin: 0;
    box-shadow: none;
    animation: none;
    pointer-events: none;
}

#viewerCloseBtn {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: white;
    transition: var(--transition);
    z-index: 1002;
    font-size: 1.5rem;
    line-height: 1;
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    flex-shrink: 0;
    font-family: inherit;
    font-weight: normal;
    text-align: center;
}

#viewerCloseBtn:hover {
    background: rgba(0, 0, 0, 0.9);
    color: white;
    transform: scale(1.05);
    border-color: rgba(255, 255, 255, 0.2);
}

#viewerCloseBtn:active {
    transform: scale(0.95);
}

.viewer-content {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    padding: 60px 20px 20px 20px;
    box-sizing: border-box;
    pointer-events: none;
}

.viewer-content img,
.viewer-content video {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    background: var(--bg-secondary);
    object-fit: contain;
    pointer-events: auto;
    cursor: default;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    transition: transform 0.2s ease;
}

.zoom-info {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    color: white;
    font-size: 0.875rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: 1003;
}

.zoom-info.show {
    opacity: 1;
}

.notification {
    position: fixed;
    bottom: calc(var(--safe-area-inset-bottom) + var(--spacing-lg));
    right: calc(var(--safe-area-inset-right) + var(--spacing-lg));
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-sm);
    color: white;
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    font-weight: 500;
    animation: slideInRight 0.3s ease;
    z-index: 2000;
    box-shadow: var(--shadow-lg);
    max-width: 320px;
}

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

.notification.success {
    background: var(--success);
}

.notification.error {
    background: var(--error);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

.empty-state-icon {
    font-size: clamp(3rem, 8vw, 4rem);
    opacity: 0.2;
    margin-bottom: var(--spacing-md);
}

.empty-state-text {
    font-size: clamp(1rem, 3vw, 1.125rem);
    margin-bottom: var(--spacing-sm);
}

.empty-state-hint {
    font-size: clamp(0.75rem, 2vw, 0.875rem);
    opacity: 0.7;
}

@media (min-width: 1600px) {
    :root {
        --sidebar-width: 360px;
    }
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        position: fixed;
        top: 0;
        height: 100vh;
        height: 100dvh;
        overflow: hidden;
        display: flex;
        flex-direction: column;
        -webkit-overflow-scrolling: touch;
        z-index: 90;
    }

    .sidebar.active {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }

    .sidebar-content {
        padding-top: calc(var(--spacing-lg) + var(--safe-area-inset-top));
        padding-bottom: calc(120px + var(--safe-area-inset-bottom));
        overflow-y: auto;
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
        flex: 1;
    }

    .main-content {
        margin-left: 0;
    }

    .upload-area-container {
        left: 0;
        padding-left: calc(var(--safe-area-inset-left) + var(--spacing-md));
        padding-right: calc(var(--safe-area-inset-right) + var(--spacing-md));
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

@media (max-width: 768px) and (orientation: landscape) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .gallery-item-preview {
        height: 120px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 56px;
        --sidebar-width: 280px;
    }

    .upload-area {
        padding: var(--spacing-md);
    }

    .main-content-inner {
        padding: var(--spacing-md);
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--spacing-sm);
    }

    .gallery-item-preview {
        height: 150px;
    }

    .modal-content {
        padding: var(--spacing-lg);
        margin: var(--spacing-md);
    }

    .albums-grid {
        gap: var(--spacing-sm);
    }

    #viewerCloseBtn {
        top: calc(10px + env(safe-area-inset-top, 0px));
        right: calc(10px + env(safe-area-inset-right, 0px));
        width: 40px;
        height: 40px;
    }

    .gallery-item-info {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        width: 100%;
        box-sizing: border-box;
        padding: var(--spacing-sm);
    }

    .gallery-item-actions {
        justify-content: center;
        width: 100%;
        display: flex;
        align-items: stretch;
    }
}

@media (max-width: 480px) {
    :root {
        --sidebar-width: 100%;
        --header-height: auto;
    }

    .header {
        height: auto;
        min-height: 56px;
    }

    .header-content {
        padding: var(--spacing-sm);
        padding-left: calc(56px + var(--safe-area-inset-left) + var(--spacing-xs));
        padding-right: calc(var(--safe-area-inset-right) + var(--spacing-sm));
    }

    .upload-token-wrapper {
        max-width: none;
    }

    .upload-token-input {
        height: 32px;
        font-size: 0.875rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .main-content {
        padding-top: calc(56px + var(--safe-area-inset-top));
    }

    .upload-area p {
        font-size: 0.75rem;
    }

    .upload-area-icon {
        font-size: 1.5rem;
    }

    .albums-grid {
        grid-template-columns: 1fr;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    }

    .gallery-item-preview {
        height: 110px;
    }

    .gallery-item-info {
        padding: var(--spacing-sm);
        display: flex;
        flex-direction: column;
        align-items: stretch;
    }

    .gallery-item-name {
        width: 100%;
        text-align: left;
    }

    .gallery-item-actions {
        gap: var(--spacing-xs);
        margin-top: var(--spacing-xs);
        width: 100%;
        display: flex;
        justify-content: center;
    }

    .action-btn {
        min-height: 36px;
        padding: var(--spacing-xs);
        flex: 1 1 33.33%;
        width: auto;
        margin: 0;
    }

    .action-btn svg {
        width: 18px;
        height: 18px;
        flex-shrink: 0;
    }

    .modal h3 {
        font-size: 1.125rem;
        margin-bottom: var(--spacing-md);
    }

    .modal-field {
        margin-bottom: var(--spacing-md);
    }

    .modal-checkbox-field {
        gap: var(--spacing-sm);
    }

    .modal-hint {
        font-size: 0.75rem;
    }

    .modal-actions {
        flex-direction: column;
        margin-top: var(--spacing-lg);
    }

    .modal button {
        width: 100%;
    }

    .notification {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
        max-width: none;
    }

    .viewer-content {
        padding: var(--spacing-sm);
    }

    .viewer-content img,
    .viewer-content video {
        max-width: calc(100vw - var(--spacing-sm) * 2);
        max-height: calc(100vh - var(--spacing-sm) * 2 - 60px);
    }
}

@media (max-width: 360px) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    }

    .gallery-item-preview {
        height: 90px;
    }

    .gallery-item-info {
        padding: var(--spacing-xs) var(--spacing-sm);
        display: flex;
        flex-direction: column;
        align-items: stretch;
    }

    .gallery-item-name {
        font-size: 0.7rem;
        width: 100%;
        text-align: left;
    }

    .gallery-item-actions {
        gap: 4px;
        display: flex;
        justify-content: center;
        width: 100%;
        margin-top: 4px;
    }

    .action-btn {
        padding: 4px;
        flex: 1 1 33.33%;
        min-width: 0;
        box-sizing: border-box;
        width: auto;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0;
    }

    .action-btn svg {
        width: 16px;
        height: 16px;
        flex-shrink: 0;
    }
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.sidebar-content::-webkit-scrollbar {
    width: 4px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: transparent;
}

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

@media (pointer: coarse) {
    button, .action-btn, .album-tile, .no-album-tile, input, .modal-close {
        min-height: 44px;
        min-width: 44px;
    }
}

@media (prefers-contrast: high) {
    :root {
        --border: rgba(255, 255, 255, 0.2);
        --border-hover: rgba(255, 255, 255, 0.3);
    }
}

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

@media print {
    .header, .sidebar, .upload-area-container, .mobile-menu-toggle, .action-btn {
        display: none !important;
    }

    .main-content {
        margin: 0;
        padding: 0;
    }

    .gallery-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}