@media (max-width: 1200px) {
  .app-container {
    padding: 0 1rem;
  }
  
  .app-footer .footer-container {
    padding: 0 1rem;
  }
}

@media (max-width: 1100px) {
  .app-header {
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
  }
  
  .header-brand {
    flex: 1;
    min-width: 180px;
  }
  
  .mode-switcher {
    flex: 1;
    justify-content: center;
    min-width: 280px;
    order: 3;
  }
  
  .header-actions {
    flex: none;
    gap: 0.5rem;
  }
}

@media (max-width: 1024px) {
  .city-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .local-time-card {
    padding: 1rem 1.5rem;
  }
}

@media (max-width: 900px) {
  .app-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }
  
  .header-brand {
    justify-content: center;
    flex: none;
    min-width: auto;
  }
  
  .mode-switcher {
    flex: none;
    justify-content: space-around;
    order: 2;
    min-width: auto;
  }
  
  .mode-btn {
    padding: 0.5rem;
    flex: 1;
    justify-content: center;
    font-size: 0.75rem;
    gap: 0.2rem;
  }
  
  .logo-slogan {
    display: none;
  }
  
  .header-actions {
    justify-content: center;
    order: 3;
  }
}

@media (max-width: 768px) {
  .app-header {
    padding: 0.75rem 0;
    margin-bottom: 1rem;
  }

  .logo-icon {
    width: 32px;
    height: 32px;
  }

  .logo-text {
    font-size: 1.125rem;
  }

  .dashboard {
    gap: 1rem;
    max-width: 100%;
    overflow-x: hidden;
  }
  
  .local-time-card {
    padding: 1rem;
  }
  
  .local-time-display {
    font-size: 2.5rem;
  }
  
  .city-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .city-card {
    padding: 1rem;
  }
  
  .local-time {
    font-size: 2rem;
  }
  
  .etz-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .etz-table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .etz-top-header {
    flex-direction: column;
    gap: 0.5rem;
    align-items: stretch;
  }
  
  .etz-header-center {
    align-items: center;
    order: -1;
  }
  
  .etz-add-btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
  }
  
  .etz-local-time {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .etz-header-controls {
    margin-left: 0;
  }
  
  .etz-header-tz,
  .etz-cell-tz {
    width: 180px;
  }
  
  .etz-group-header-tz {
    width: 180px;
  }
  
  .etz-table-header,
  .etz-group-header,
  .etz-row {
    min-width: 396px;
  }
  
  .region-tabs {
    max-height: 80px;
    flex-wrap: wrap;
  }
  
  .region-tab {
    font-size: 0.75rem;
    padding: 0.375rem 0.625rem;
  }
  
  .modal-content {
    margin: 1rem;
    max-height: calc(100vh - 2rem);
    overflow-y: auto;
  }
  
  .city-list-item {
    padding: 0.75rem;
  }
  
  .city-name-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}

@media (max-width: 640px) {
  .app-container {
    padding: 0 0.75rem;
  }
  
  .local-time-card {
    padding: 0.875rem;
  }
  
  .local-time-display {
    font-size: 2rem;
  }
  
  .time-hours, .time-minutes {
    font-size: 2.5rem;
  }
  
  .time-seconds {
    font-size: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
  }
  
  .etz-header-tz {
    width: 160px;
  }
  
  .etz-cell-tz {
    width: 160px;
  }
  
  .etz-group-header-tz {
    width: 160px;
  }
  
  .etz-table-header,
  .etz-group-header,
  .etz-row {
    min-width: 376px;
  }
  
  .etz-cell-name {
    font-size: 0.875rem;
  }
  
  .etz-cell-meta {
    font-size: 0.75rem;
  }
  
  .etz-cell-time-value {
    font-size: 0.875rem;
  }
  
  .etz-hour-label {
    font-size: 9px;
  }
  
  .etz-legend {
    flex-wrap: wrap;
    gap: 0.75rem;
  }
  
  .etz-legend-item {
    font-size: 0.75rem;
  }
  
  .city-info {
    gap: 0.25rem;
  }
  
  .city-name {
    font-size: 0.875rem;
  }
  
  .city-timezone {
    font-size: 0.75rem;
  }
  
  .add-btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
  }
  
  .added-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
  }
  
  .theme-toggle, .lang-toggle {
    width: 36px;
    height: 36px;
  }
}

@media (max-width: 480px) {
  .app-header {
    padding: 0.5rem 0;
    gap: 0.5rem;
  }
  
  .logo-icon {
    width: 28px;
    height: 28px;
  }
  
  .logo-text {
    font-size: 1rem;
  }
  
  .mode-btn {
    padding: 0.375rem;
    font-size: 0.75rem;
    gap: 0.15rem;
  }
  
  .mode-btn svg {
    width: 14px;
    height: 14px;
  }
  
  .add-city-btn {
    width: 36px;
    height: 36px;
  }
  
  .add-city-btn svg {
    width: 14px;
    height: 14px;
  }
  
  .local-time-card {
    padding: 0.75rem;
  }
  
  .local-time-display {
    font-size: 1.75rem;
  }
  
  .time-hours, .time-minutes {
    font-size: 2rem;
  }
  
  .time-seconds {
    font-size: 1rem;
  }
  
  .local-date {
    font-size: 0.875rem;
  }
  
  .etz-header-tz,
  .etz-cell-tz {
    width: 140px;
    padding: 0.5rem 0.75rem;
  }
  
  .etz-group-header-tz {
    width: 140px;
  }
  
  .etz-table-header,
  .etz-group-header,
  .etz-row {
    min-width: 320px;
  }
  
  .etz-cell-flag {
    font-size: 1rem;
    width: 24px;
    height: 24px;
  }
  
  .etz-cell-info {
    gap: 0.125rem;
  }
  
  .etz-city-timebar {
    min-width: 180px;
  }
  
  .etz-city-hour {
    min-width: 2px;
  }
  
  .etz-cell-name {
    font-size: 0.8125rem;
  }
  
  .etz-cell-meta {
    font-size: 0.6875rem;
  }
  
  .etz-cell-current-time {
    gap: 0.25rem;
  }
  
  .etz-cell-time-value {
    font-size: 0.75rem;
  }
  
  .etz-cell-remove {
    width: 24px;
    height: 24px;
  }
  
  .etz-cell-remove svg {
    width: 10px;
    height: 10px;
  }
  
  .region-tabs {
    padding: 0.5rem;
    gap: 0.25rem;
  }
  
  .region-tab {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
  }
  
  .modal-content {
    margin: 0.5rem;
    padding: 1rem;
  }
  
  .modal-header {
    padding: 0.75rem 0;
  }
  
  .modal-header h3 {
    font-size: 1rem;
  }
  
  .modal-search {
    margin-bottom: 0.75rem;
  }
  
  .search-input {
    padding: 0.5rem;
    font-size: 0.875rem;
  }
  
  .city-list {
    max-height: 40vh;
  }
}

@media (max-width: 360px) {
  .app-container {
    padding: 0 0.5rem;
  }
  
  .logo-text {
    font-size: 0.875rem;
  }
  
  .local-time-display {
    font-size: 1.5rem;
  }
  
  .time-hours, .time-minutes {
    font-size: 1.75rem;
  }
  
  .time-seconds {
    font-size: 0.875rem;
  }
  
  .etz-header-tz,
  .etz-cell-tz {
    width: 120px;
    padding: 0.375rem 0.5rem;
  }
  
  .etz-group-header-tz {
    width: 120px;
  }
  
  .etz-table-header,
  .etz-group-header,
  .etz-row {
    min-width: 270px;
  }
  
  .etz-cell-name {
    font-size: 0.75rem;
  }
  
  .etz-cell-meta {
    font-size: 0.625rem;
  }
  
  .etz-cell-time-value {
    font-size: 0.6875rem;
  }
  
  .etz-city-timebar {
    min-width: 150px;
  }
  
  .etz-city-hour {
    min-width: 1px;
  }
  
  .region-tab {
    font-size: 0.625rem;
    padding: 0.2rem 0.4rem;
  }
}

/* ============================================
   Mobile ETZ Card Layout (≤768px)
   Overrides desktop table layout for narrow screens
   ============================================ */
@media (max-width: 768px) {
  .etz-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-x pan-y;
    position: relative;
  }

  .etz-table-container {
    overflow-x: visible;
    max-height: none;
  }

  .etz-table {
    min-width: auto;
  }

  .etz-table-header,
  .etz-group-header,
  .etz-row {
    display: none;
  }

  .etz-cursors-overlay {
    display: none !important;
  }

  #etzTable {
    position: relative;
  }

  .etz-mobile-cards {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 4px 0;
  }

  .etz-mobile-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 10px 12px 8px;
    transition: border-color var(--transition-fast);
    position: relative;
  }

  .etz-mobile-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
  }

  .etz-mobile-card-left {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
  }

  .etz-mobile-card-flag {
    font-size: 1.25rem;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .etz-mobile-card-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
  }

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

  .etz-mobile-card-meta {
    font-size: 0.6875rem;
    color: var(--text-muted);
  }

  .etz-mobile-card-meta .etz-cell-dst-badge {
    font-size: 0.5rem;
    padding: 0.05rem 0.3rem;
    margin-left: 3px;
  }

  .etz-mobile-card-right {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
  }

  .etz-mobile-card-time {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
  }

  .etz-mobile-card-time-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    line-height: 1.2;
  }

  .etz-mobile-card-date-value {
    font-size: 0.625rem;
    color: var(--text-muted);
  }

  .etz-mobile-card-status {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
  }

  .etz-mobile-card-status.status-working {
    background: var(--status-working);
    box-shadow: 0 0 4px var(--status-working);
  }

  .etz-mobile-card-status.status-weekend-work {
    background: var(--timeline-weekend-work);
    box-shadow: 0 0 4px var(--timeline-weekend-work);
  }

  .etz-mobile-card-status.status-off {
    background: var(--border-color);
  }

  .etz-mobile-card-remove {
    width: 26px;
    height: 26px;
    border: none;
    background: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    flex-shrink: 0;
    transition: color var(--transition-fast);
  }

  .etz-mobile-card-remove:active {
    color: var(--color-error, #ef4444);
  }

  .etz-mobile-timebar-wrapper {
    position: relative;
    margin-bottom: 2px;
    cursor: pointer;
  }

  .etz-mobile-timebar {
    display: flex;
    height: 26px;
    border-radius: 6px;
    overflow: hidden;
  }

  .etz-mobile-hour {
    flex: 1;
    min-width: 0;
  }

  .etz-mobile-hour.work {
    background: var(--timeline-work);
  }

  .etz-mobile-hour.weekend-work {
    background: var(--timeline-weekend-work);
  }

  .etz-mobile-hour.off {
    background: var(--border-color);
  }

  .etz-mobile-cursor-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 50;
    touch-action: pan-x;
  }

  .etz-mobile-cursor-overlay.is-dragging {
    touch-action: none;
  }
  
  .etz-mobile-cursor-overlay .etz-cursor {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 1px;
    pointer-events: auto;
    cursor: ew-resize;
  }
  
  .etz-mobile-cursor-overlay .etz-cursor-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background: inherit;
  }
  
  .etz-mobile-cursor-overlay .etz-cursor-now .etz-cursor-line {
    background: var(--status-late-night);
    box-shadow: 0 0 6px rgba(239, 68, 68, 0.4);
  }
  
  .etz-mobile-cursor-overlay .etz-cursor-drag .etz-cursor-line {
    background: var(--color-primary);
    box-shadow: 0 0 6px rgba(79, 70, 229, 0.4);
  }
  
  .etz-mobile-cursor-overlay .etz-cursor-badge {
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 8px;
    border-radius: 6px;
    white-space: nowrap;
    pointer-events: auto;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
  }
  
  .etz-mobile-cursor-overlay .etz-cursor-now .etz-cursor-badge {
    background: var(--status-late-night);
  }
  
  .etz-mobile-cursor-overlay .etz-cursor-drag-badge {
    background: var(--color-primary);
  }
  
  .etz-mobile-cursor-overlay .etz-cursor-label {
    font-size: 10px;
    font-weight: 700;
    color: white;
    letter-spacing: 0.5px;
  }
  
  .etz-mobile-cursor-overlay .etz-cursor-date {
    display: none;
  }

  .etz-mobile-hour-labels {
    display: flex;
    justify-content: space-between;
    padding: 0 1px;
  }

  .etz-mobile-hour-labels span {
    font-size: 0.5625rem;
    color: var(--text-muted);
    min-width: 14px;
    text-align: center;
  }

  .etz-mobile-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    gap: 12px;
    text-align: center;
  }
  
  .etz-mobile-city-time-tooltip {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-card);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 9px;
    font-weight: 600;
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    white-space: nowrap;
    z-index: 102;
    pointer-events: none;
  }
  
  .etz-mobile-city-time {
    line-height: 1.2;
  }
  
  .etz-mobile-city-date {
    font-size: 7px;
    opacity: 0.7;
    line-height: 1.2;
  }
  
  /* Features Section - Mobile Grid */
  .features-section {
    padding: 1rem 0;
    margin-top: 0.5rem;
    border-radius: var(--radius-lg);
    max-width: 100%;
    overflow-x: hidden;
  }

  .features-header {
    margin-bottom: 0.75rem;
    padding: 0 0.5rem;
  }

  .features-header h2 {
    font-size: 1rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }

  .features-header p {
    font-size: 0.75rem;
    display: none;
  }

  .features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.625rem;
    max-width: 100%;
    overflow: hidden;
  }
  
  .feature-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.5rem;
    padding: 1rem 0.75rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
    position: relative;
    max-width: 100%;
    overflow: hidden;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }

  .feature-card:active {
    background: var(--bg-secondary);
  }

  .feature-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-bottom: 0;
  }

  .feature-icon svg {
    width: 20px;
    height: 20px;
  }

  .feature-content {
    flex: 1;
    min-width: 0;
    max-width: 100%;
    width: 100%;
    overflow: hidden;
  }

  .feature-card h3 {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
    line-height: 1.3;
  }

  .feature-card p {
    font-size: 0.6875rem;
    color: var(--text-muted);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    max-width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
  
  .feature-link {
    display: none;
  }
  
  /* Quick Meeting Card - Mobile */
  .quick-meeting-card {
    padding: 1rem;
    margin-top: 1rem;
    border-radius: var(--radius-lg);
  }
  
  .quick-meeting-content {
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
  }
  
  .quick-meeting-text h3 {
    font-size: 0.9375rem;
  }
  
  .quick-meeting-text p {
    font-size: 0.75rem;
  }
  
  .quick-meeting-btn {
    width: 100%;
    text-align: center;
    padding: 0.625rem;
    font-size: 0.8125rem;
  }
  
  /* Footer - Mobile Simplified */
  .app-footer {
    padding: 1rem 0;
    margin-top: 1rem;
  }
  
  .footer-content {
    display: none;
  }
  
  .footer-bottom {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
  }
  
  .footer-bottom p {
    font-size: 0.6875rem;
    color: var(--text-muted);
  }
}

@media (max-width: 480px) {
  .features-section {
    padding: 0.75rem 0;
    margin-top: 0.25rem;
  }

  .features-header {
    padding: 0 0.25rem;
  }

  .features-header h2 {
    font-size: 0.9375rem;
    line-height: 1.2;
  }

  .features-grid {
    gap: 0.5rem;
  }

  .feature-card {
    padding: 0.625rem 0.5rem;
    gap: 0.375rem;
  }

  .feature-icon {
    width: 28px;
    height: 28px;
  }

  .feature-icon svg {
    width: 14px;
    height: 14px;
  }

  .feature-card h3 {
    font-size: 0.7rem;
    margin-bottom: 0.125rem;
  }

  .feature-card p {
    font-size: 0.625rem;
    -webkit-line-clamp: 1;
  }
  
  .quick-meeting-card {
    padding: 0.875rem;
  }
  
  .quick-meeting-text h3 {
    font-size: 0.875rem;
  }
  
  .quick-meeting-text p {
    font-size: 0.6875rem;
  }
  
  .quick-meeting-btn {
    padding: 0.5rem;
    font-size: 0.75rem;
  }
}