@media(max-width:860px) {
  .app-header {
    padding: 12px 17px;
  }
  .brand {
    min-width: 0;
    font-size: 19px;
  }
  .layout {
    grid-template-columns: 1fr;
    padding: 7px 12px 24px;
  }
  .sidebar {
    display: none;
  }
  .message-top {
    padding: 24px 26px 16px;
  }
  .bodywrap {
    padding: 9px 26px 38px;
  }
  .mode {
    font-size: 10px;
  }
}

@media(max-width:540px) {
  .app-header {
    gap: 10px;
  }
  .searchbox {
    max-width: 180px;
    height: 41px;
    padding: 0 12px;
  }
  .mode {
    display: none;
  }
  .panel {
    min-height: 540px;
  }
  .message-top {
    padding: 21px 19px 12px;
  }
  .message-title {
    font-size: 22px;
  }
  .date {
    display: block;
    white-space: normal;
    font-size: 11px;
    max-width: 110px;
  }
  .bodywrap {
    padding: 5px 13px 30px;
  }
  .letter {
    padding: 22px 12px;
    border: 0;
  }
  .letter h2 {
    font-size: 23px;
  }
  .activity {
    padding: 17px;
  }
  .list-item {
    gap: 6px;
    padding: 14px;
  }
  .list-item .name {
    min-width: 105px;
  }
  .dialog {
    right: 0;
    width: 100vw;
  }
  .reveal {
    padding: 32px 23px;
  }
}

@media(max-width:540px) {
  .training-banner {
    font-size: 11px;
    padding: 9px 10px;
  }
  .brand {
    font-size: 16px;
  }
}

@media print {
  .training-banner {
    position: static;
  }
}

@media(max-width:540px) {
  .mk-logo {
    font-size: 20px;
  }
  .mk-tiles {
    width: 33px;
    height: 33px;
  }
  .item-open {
    gap: 7px;
  }
}

/* Navigation bleibt auch auf Smartphones bedienbar. */
@media (max-width: 860px) {
  .sidebar {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 2px 0 11px;
    scrollbar-width: thin;
  }
  .compose {
    flex: 0 0 auto;
    margin: 0;
    padding: 10px 15px;
    white-space: nowrap;
  }
  .folder {
    flex: 0 0 auto;
    width: auto;
    min-height: 41px;
    padding: 0 13px;
    gap: 8px;
    border-radius: 22px;
    white-space: nowrap;
  }
  .folder .count { margin-left: 0; }
}