.ldim-messages-wrapper {
    position: relative;
    min-height: 500px;
    max-width: 100%;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.ldim-admin-wrapper {
    margin-top: 20px;
}

.ldim-sidebar {
    width: 100%;
    min-width: 260px;
    background: #f8f9fa;
    display: flex;
    flex-direction: column;
    height: 500px;
}

.ldim-chat-area {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #fff;
    display: none;
    flex-direction: column;
    z-index: 10;
}

.ldim-chat-area.active {
    display: flex;
}

.ldim-back-btn {
    background: none;
    border: none;
    padding: 0 15px 0 0;
    cursor: pointer;
    font-size: 20px;
    color: #666;
    display: flex;
    align-items: center;
}

.ldim-back-btn:hover {
    color: #333;
}

.ldim-chat-header {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
    background: #fff;
}

.ldim-sidebar h3 {
    padding: 20px;
    margin: 0;
    border-bottom: 1px solid #e0e0e0;
    font-size: 18px;
    color: #333;
}

.ldim-conversations-list {
    flex: 1;
    overflow-y: auto;
}

.ldim-conversation-item {
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
    cursor: pointer;
    transition: background-color 0.2s;
}

.ldim-conversation-item:hover {
    background-color: #e9ecef;
}

.ldim-conversation-item.active {
    background-color: #e3f2fd;
    border-left: 3px solid var(--e-global-color-primary, #1976d2);
}

.ldim-conversation-item .ldim-conv-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
}

.ldim-conversation-item .ldim-conv-name {
    font-weight: 600;
    color: #333;
    font-size: 14px;
}

.ldim-conversation-item .ldim-conv-time {
    font-size: 12px;
    color: #999;
}

.ldim-conversation-item .ldim-conv-course {
    font-size: 12px;
    color: #666;
    margin-bottom: 5px;
}

.ldim-conversation-item .ldim-conv-preview {
    font-size: 13px;
    color: #666;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ldim-conversation-item .ldim-unread-badge {
    display: inline-block;
    background: var(--e-global-color-primary, #1976d2);
    color: #fff;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
    margin-left: 10px;
}

.ldim-new-conversation {
    padding: 15px 20px;
    border-top: 1px solid #e0e0e0;
    background: #fff;
}

.ldim-new-conversation h4 {
    margin: 0 0 10px 0;
    font-size: 14px;
    color: #333;
}

.ldim-new-conversation select {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 10px;
    font-size: 14px;
}

.ldim-new-conversation button {
    width: 100%;
    padding: 10px;
    background: var(--e-global-color-primary, #1976d2);
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

.ldim-new-conversation button:hover {
    opacity: 0.9;
}

.ldim-chat-header-content {
    flex: 1;
}

.ldim-chat-title {
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

.ldim-chat-subtitle {
    font-size: 13px;
    color: #666;
    display: block;
    margin-top: 5px;
}

.ldim-chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: #f5f5f5;
}

.ldim-message {
    max-width: 100%;
    margin-bottom: 15px;
    clear: both;
}

.ldim-message.mine {
    float: right;
}

.ldim-message.theirs {
    float: left;
}

.ldim-message-bubble {
    padding: 12px 16px;
    border-radius: 18px;
    font-size: 14px;
    line-height: 1.4;
}

.ldim-message.mine .ldim-message-bubble {
    background: var(--e-global-color-primary, #1976d2);
    color: #fff;
    border-bottom-right-radius: 4px;
}

.ldim-message.theirs .ldim-message-bubble {
    background: #fff;
    color: #333;
    border-bottom-left-radius: 4px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.ldim-message-meta {
    font-size: 11px;
    color: #999;
    margin-top: 5px;
    padding: 0 5px;
}

.ldim-message.mine .ldim-message-meta {
    text-align: right;
}

.ldim-chat-input {
    padding: 15px 20px;
    border-top: 1px solid #e0e0e0;
    background: #fff;
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.ldim-chat-input textarea {
    flex: 1;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 20px;
    resize: none !important;
    font-size: 14px;
    font-family: inherit;
    max-height: 60px !important;
    min-height: 40px !important;
    height: 40px !important;
}

.ldim-chat-input textarea:focus {
    outline: none;
    border-color: var(--e-global-color-primary, #1976d2);
}

.ldim-send-btn {
    width: 44px !important;
    height: 44px !important;
    min-width: 44px !important;
    max-width: 44px !important;
    padding: 0 !important;
    margin: 0 !important;
    background: var(--e-global-color-primary, #1976d2) !important;
    color: #fff !important;
    border: none !important;
    border-radius: 50% !important;
    cursor: pointer;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    transition: transform 0.2s, background-color 0.2s;
    flex-shrink: 0;
    box-sizing: border-box !important;
}

.ldim-send-btn:hover {
    transform: scale(1.05);
}

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

.ldim-chat-input .ldim-send-btn svg,
.ldim-send-btn svg {
    width: 20px !important;
    height: 20px !important;
    min-width: 20px !important;
    min-height: 20px !important;
    max-width: 20px !important;
    max-height: 20px !important;
    fill: #fff !important;
    margin-left: 2px;
    display: inline-block !important;
    vertical-align: middle;
}

.ldim-chat-input .ldim-send-btn svg path,
.ldim-send-btn svg path {
    fill: #fff !important;
}

.ldim-no-conversations {
    padding: 30px 20px;
    text-align: center;
    color: #999;
}

.ldim-loading {
    padding: 30px;
    text-align: center;
    color: #666;
}

.ldim-empty-chat {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #999;
    font-size: 15px;
}

@media (max-width: 768px) {
    .ldim-messages-wrapper {
        flex-direction: column;
        min-height: auto;
    }

    .ldim-sidebar {
        width: 100%;
        min-width: 100%;
        max-height: 300px;
    }

    .ldim-message {
        max-width: 85%;
    }
}