.ap-mail-shell {
      display: flex;
      height: calc(100vh - var(--ap-topbar-h) - 3rem);
      min-height: 560px;
      overflow: hidden;
    }

    /* Folders panel */
    .ap-mail-folders {
      width: 220px;
      flex-shrink: 0;
      border-right: 1px solid var(--ap-border);
      padding: 1rem .75rem;
      overflow-y: auto;
    }

    .ap-compose-btn {
      width: 100%;
      margin-bottom: 1rem;
    }

    .ap-folder-link {
      display: flex;
      align-items: center;
      gap: .65rem;
      padding: .55rem .7rem;
      border-radius: var(--ap-radius-sm);
      color: var(--ap-text);
      font-weight: 500;
      font-size: .85rem;
      margin-bottom: .1rem;
      cursor: pointer;
    }

    .ap-folder-link i {
      font-size: 1rem;
      width: 18px;
      text-align: center;
    }

    .ap-folder-link:hover {
      background: var(--ap-bg);
      color: var(--ap-text-strong);
    }

    .ap-folder-link.active {
      background: var(--ap-primary-100);
      color: var(--ap-primary);
      font-weight: 600;
    }

    .ap-folder-count {
      margin-left: auto;
      font-size: .7rem;
      font-weight: 700;
      color: var(--ap-secondary);
    }

    .ap-folder-link.active .ap-folder-count {
      color: var(--ap-primary);
    }

    .ap-label-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      display: inline-block;
      flex-shrink: 0;
    }

    /* Email list panel */
    .ap-mail-list {
      width: 360px;
      flex-shrink: 0;
      border-right: 1px solid var(--ap-border);
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }

    .ap-mail-list-head {
      padding: .85rem 1rem;
      border-bottom: 1px solid var(--ap-border);
      flex-shrink: 0;
    }

    .ap-mail-list-items {
      flex: 1;
      overflow-y: auto;
    }

    .ap-mail-item {
      display: flex;
      gap: .7rem;
      padding: .85rem 1rem;
      border-bottom: 1px solid var(--ap-border);
      cursor: pointer;
      position: relative;
    }

    .ap-mail-item:hover {
      background: var(--ap-bg);
    }

    .ap-mail-item.active {
      background: var(--ap-primary-100);
    }

    .ap-mail-item.unread .ap-mail-sender,
    .ap-mail-item.unread .ap-mail-subject {
      font-weight: 700;
      color: var(--ap-text-strong);
    }

    .ap-mail-item.unread::before {
      content: '';
      position: absolute;
      left: 6px;
      top: 50%;
      transform: translateY(-50%);
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--ap-primary);
    }

    .ap-mail-avatar {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      object-fit: cover;
      flex-shrink: 0;
    }

    .ap-mail-body-col {
      flex: 1;
      min-width: 0;
    }

    .ap-mail-top-row {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      gap: .4rem;
    }

    .ap-mail-sender {
      font-size: .85rem;
      color: var(--ap-text);
      font-weight: 500;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .ap-mail-time {
      font-size: .7rem;
      color: var(--ap-secondary);
      flex-shrink: 0;
    }

    .ap-mail-subject {
      font-size: .83rem;
      color: var(--ap-text);
      margin-top: .1rem;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .ap-mail-preview {
      font-size: .78rem;
      color: var(--ap-secondary);
      margin-top: .1rem;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .ap-mail-star {
      position: absolute;
      top: .85rem;
      right: .75rem;
      color: var(--ap-border);
      font-size: .95rem;
      cursor: pointer;
    }

    .ap-mail-star.starred {
      color: var(--ap-warning);
    }

    .ap-mail-empty {
      padding: 3rem 1.5rem;
      text-align: center;
      color: var(--ap-secondary);
      font-size: .85rem;
    }

    /* Reading pane */
    .ap-mail-reader {
      flex: 1;
      min-width: 0;
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }

    .ap-mail-reader-head {
      padding: 1.1rem 1.5rem;
      border-bottom: 1px solid var(--ap-border);
      flex-shrink: 0;
    }

    .ap-mail-reader-subject {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--ap-text-strong);
      margin-bottom: .6rem;
    }

    .ap-mail-reader-body {
      flex: 1;
      overflow-y: auto;
      padding: 1.5rem;
    }

    .ap-mail-reader-body p {
      margin-bottom: 1rem;
      line-height: 1.7;
      font-size: .9rem;
    }

    .ap-mail-reader-toolbar {
      padding: .85rem 1.5rem;
      border-top: 1px solid var(--ap-border);
      flex-shrink: 0;
    }

    .ap-mail-reader-placeholder {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: var(--ap-secondary);
      gap: .5rem;
    }

    .ap-mail-reader-placeholder i {
      font-size: 2.5rem;
      opacity: .35;
    }

    @media (max-width: 1199.98px) {
      .ap-mail-folders {
        display: none;
      }
    }

    @media (max-width: 767.98px) {
      .ap-mail-shell {
        position: relative;
      }

      .ap-mail-list {
        width: 100%;
        border-right: none;
      }

      .ap-mail-reader {
        display: none;
        position: absolute;
        inset: 0;
        background: var(--ap-surface);
        z-index: 5;
      }

      .ap-mail-reader.show {
        display: flex;
      }

      .ap-mail-list.hide-mobile {
        display: none;
      }

      .ap-mail-back {
        display: inline-flex !important;
      }
    }

    .ap-mail-back {
      display: none;
    }

    /* ============ Utility classes (extracted from inline styles) ============ */

    /* Font sizes */
    .ap-fs-13 {
      font-size: 1.3rem;
    }

    .ap-fs-06 {
      font-size: .6rem;
    }

    .ap-fs-085 {
      font-size: .85rem;
    }

    .ap-fs-072 {
      font-size: .72rem;
    }

    .ap-fs-18 {
      font-size: 1.8rem;
    }

    /* Text colors */
    .ap-color-strong {
      color: var(--ap-text-strong);
    }

    .ap-color-secondary {
      color: var(--ap-secondary);
    }

    /* Transparent button */
    .ap-btn-transparent {
      background: transparent;
    }

    /* Small dropdown menu */
    .ap-menu-sm {
      font-size: .85rem;
    }

    /* Sidebar section title with indent */
    .ap-nav-section-indent {
      padding-left: .7rem;
    }

    /* Label dots */
    .ap-label-dot-work {
      background: var(--ap-primary);
    }

    .ap-label-dot-personal {
      background: var(--ap-success);
    }

    .ap-label-dot-important {
      background: var(--ap-warning);
    }

    /* Themed input (mail search + compose fields) */
    .ap-input-themed {
      background: var(--ap-bg);
      border-color: var(--ap-border);
      color: var(--ap-text-strong);
    }

    /* Themed modal */
    .ap-modal-content-themed {
      background: var(--ap-surface);
      border-color: var(--ap-border);
    }

    .ap-modal-header-themed {
      border-color: var(--ap-border);
    }

    .ap-modal-title-themed {
      color: var(--ap-text-strong);
    }

    .ap-modal-footer-themed {
      border-color: var(--ap-border);
    }

    /* Empty-state icon (list) */
    .ap-mail-empty-icon {
      font-size: 1.8rem;
      opacity: .35;
    }

    /* Reader pane: smaller avatar */
    .ap-mail-reader-avatar {
      width: 34px;
      height: 34px;
    }

    /* Reader pane: name and time */
    .ap-mail-reader-name {
      font-size: .85rem;
      font-weight: 600;
      color: var(--ap-text-strong);
    }

    .ap-mail-reader-time {
      font-size: .72rem;
      color: var(--ap-secondary);
    }

    /* Reader pane: label badge */
    .ap-mail-label-badge {
      background: var(--ap-primary-100);
      color: var(--ap-primary);
      font-weight: 600;
    }

    /* Footer */
    .ap-footer {
      color: var(--ap-secondary);
    }