.ap-msg-shell {
      display: flex;
      height: calc(100vh - var(--ap-topbar-h) - 3rem);
      background: var(--ap-surface);
      border: 1px solid var(--ap-border);
      border-radius: var(--ap-radius);
      overflow: hidden;
      box-shadow: var(--ap-shadow);
    }

    .ap-conv-list {
      width: 320px;
      flex-shrink: 0;
      border-right: 1px solid var(--ap-border);
      display: flex;
      flex-direction: column;
    }

    .ap-conv-head {
      padding: 1.1rem 1.1rem .8rem;
      border-bottom: 1px solid var(--ap-border);
    }

    .ap-conv-search {
      position: relative;
    }

    .ap-conv-search input {
      width: 100%;
      background: var(--ap-bg);
      border: 1px solid var(--ap-border);
      border-radius: 20px;
      padding: .5rem .8rem .5rem 2.1rem;
      font-size: .83rem;
      color: var(--ap-text-strong);
    }

    .ap-conv-search i {
      position: absolute;
      left: .75rem;
      top: 50%;
      transform: translateY(-50%);
      color: var(--ap-secondary);
      font-size: .85rem;
    }

    .ap-conv-tabs {
      display: flex;
      gap: .4rem;
      padding: .7rem 1.1rem 0;
      margin-bottom: 5px;
    }

    .ap-conv-tab {
      font-size: .75rem;
      font-weight: 600;
      padding: .3rem .7rem;
      border-radius: 20px;
      color: var(--ap-secondary);
      cursor: pointer;
    }

    .ap-conv-tab.active {
      background: var(--ap-primary-100);
      color: var(--ap-primary);
    }

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

    .ap-conv-item {
      display: flex;
      gap: .7rem;
      padding: .85rem 1.1rem;
      border-bottom: 1px solid var(--ap-border);
      cursor: pointer;
      position: relative;
    }

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

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

    .ap-conv-avatar-wrap {
      position: relative;
      flex-shrink: 0;
    }

    .ap-conv-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      object-fit: cover;
    }

    .ap-online-dot {
      position: absolute;
      bottom: 0;
      right: 0;
      width: 11px;
      height: 11px;
      border-radius: 50%;
      background: var(--ap-success);
      border: 2px solid var(--ap-surface);
    }

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

    .ap-conv-top-row {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
    }

    .ap-conv-name {
      font-size: .87rem;
      font-weight: 700;
      color: var(--ap-text-strong);
    }

    .ap-conv-time {
      font-size: .68rem;
      color: var(--ap-secondary);
      flex-shrink: 0;
    }

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

    .ap-conv-unread {
      background: var(--ap-primary);
      color: #fff;
      font-size: .65rem;
      font-weight: 700;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-top: .2rem;
      margin-left: auto;
    }

    .ap-chat-window {
      flex: 1;
      display: flex;
      flex-direction: column;
      min-width: 0;
    }

    .ap-chat-head {
      padding: .85rem 1.2rem;
      border-bottom: 1px solid var(--ap-border);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .ap-chat-head-user {
      display: flex;
      align-items: center;
      gap: .7rem;
    }

    .ap-chat-head-name {
      font-size: .9rem;
      font-weight: 700;
      color: var(--ap-text-strong);
    }

    .ap-chat-head-status {
      font-size: .74rem;
      color: var(--ap-success);
      display: flex;
      align-items: center;
      gap: .3rem;
    }

    .ap-chat-body {
      flex: 1;
      overflow-y: auto;
      padding: 1.3rem;
      display: flex;
      flex-direction: column;
      gap: .4rem;
      background: var(--ap-bg);
    }

    .ap-msg-date-sep {
      text-align: center;
      font-size: .7rem;
      color: var(--ap-secondary);
      font-weight: 600;
      margin: .6rem 0;
    }

    .ap-msg-row {
      display: flex;
      gap: .6rem;
      max-width: 66%;
    }

    .ap-msg-row.mine {
      align-self: flex-end;
      flex-direction: row-reverse;
    }

    .ap-msg-avatar {
      width: 30px;
      height: 30px;
      border-radius: 50%;
      object-fit: cover;
      flex-shrink: 0;
    }

    .ap-msg-bubble {
      background: var(--ap-surface);
      border: 1px solid var(--ap-border);
      border-radius: 14px 14px 14px 4px;
      padding: .6rem .9rem;
      font-size: .85rem;
      color: var(--ap-text-strong);
    }

    .ap-msg-row.mine .ap-msg-bubble {
      background: var(--ap-primary);
      color: #fff;
      border-color: var(--ap-primary);
      border-radius: 14px 14px 4px 14px;
    }

    .ap-msg-time {
      font-size: .65rem;
      color: var(--ap-secondary);
      margin-top: .25rem;
      display: block;
    }

    .ap-msg-row.mine .ap-msg-time {
      text-align: right;
    }

    .ap-chat-footer {
      padding: .9rem 1.2rem;
      border-top: 1px solid var(--ap-border);
      display: flex;
      align-items: center;
      gap: .6rem;
    }

    .ap-chat-input {
      flex: 1;
      background: var(--ap-bg);
      border: 1px solid var(--ap-border);
      border-radius: 20px;
      padding: .6rem 1rem;
      font-size: .85rem;
      color: var(--ap-text-strong);
    }

    .ap-chat-input:focus {
      outline: none;
      border-color: var(--ap-primary);
    }

    .ap-send-btn {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--ap-primary);
      color: #fff;
      border: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    .ap-send-btn:hover {
      background: var(--ap-primary-600);
    }

    .ap-attach-btn {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--ap-bg);
      border: 1px solid var(--ap-border);
      color: var(--ap-secondary);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    .ap-info-panel {
      width: 260px;
      flex-shrink: 0;
      border-left: 1px solid var(--ap-border);
      padding: 1.3rem;
      overflow-y: auto;
    }

    .ap-info-panel img.profile {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      object-fit: cover;
      display: block;
      margin: 0 auto .8rem;
    }

    .ap-info-row {
      display: flex;
      justify-content: space-between;
      padding: .55rem 0;
      border-bottom: 1px solid var(--ap-border);
      font-size: .82rem;
    }

    .ap-info-row:last-child {
      border-bottom: none;
    }

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

    .ap-info-row .value {
      color: var(--ap-text-strong);
      font-weight: 600;
      text-align: right;
    }

    .ap-shared-file {
      display: flex;
      align-items: center;
      gap: .5rem;
      padding: .5rem 0;
      font-size: .78rem;
      color: var(--ap-text-strong);
    }

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

    @media (max-width: 767.98px) {
      .ap-conv-list {
        position: absolute;
        inset: 0;
        z-index: 5;
        background: var(--ap-surface);
        width: 100%;
      }

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

      .ap-msg-shell {
        position: relative;
      }
    }

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

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

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

    .ap-fs-05 {
      font-size: .5rem;
    }

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

    .ap-fs-083 {
      font-size: .83rem;
    }

    .ap-fs-082 {
      font-size: .82rem;
    }

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

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

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

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

    /* Background transparent (topbar user button) */
    .ap-btn-transparent {
      background: transparent;
    }

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

    /* Content area padding */
    .ap-content-messages {
      padding: 1.5rem;
    }

    /* Icon button with border */
    .ap-icon-btn-bordered {
      border: 1px solid var(--ap-border);
    }

    /* Info panel heading */
    .ap-info-heading {
      font-size: .82rem;
      color: var(--ap-text-strong);
    }

    /* Info panel name */
    .ap-info-name {
      font-weight: 700;
      color: var(--ap-text-strong);
    }

    /* Info panel sub-role */
    .ap-info-role {
      color: var(--ap-secondary);
    }

    /* Empty state (conversation list) */
    .ap-conv-empty {
      text-align: center;
      padding: 1.5rem 0;
      color: var(--ap-secondary);
      font-size: .83rem;
    }