/* Zalo Messenger Layout */
.zalo-messenger-layout {
 display: flex;
 height: calc(100vh - 140px);
 min-height: 600px;
 border: 1px solid var(--mud-palette-lines-default, #e0e0e0);
 border-radius: 8px;
 overflow: hidden;
 background: #fff;
}

/* Left Panel - Conversation List */
.zalo-conversation-list {
 width: 320px;
 min-width: 280px;
 max-width: 400px;
 border-right: 1px solid var(--mud-palette-lines-default, #e0e0e0);
 display: flex;
 flex-direction: column;
 background: #f8f9fa;
}

.zalo-conversation-header {
 padding: 12px;
 border-bottom: 1px solid var(--mud-palette-lines-default, #e0e0e0);
 background: #fff;
}

.zalo-search-field {
 background: #f5f5f5;
 border-radius: 20px;
}

.zalo-search-field .mud-input {
 padding-left: 12px;
}

.zalo-conversation-items {
 flex: 1;
 overflow-y: auto;
 padding: 8px;
}

.zalo-conversation-item {
 display: flex;
 align-items: center;
 gap: 12px;
 padding: 12px;
 border-radius: 8px;
 cursor: pointer;
 transition: background-color 0.2s ease;
 margin-bottom: 4px;
}

.zalo-conversation-item:hover {
 background: rgba(0, 0, 0, 0.04);
}

.zalo-conversation-item.active {
 background: #e3f2fd;
 border-left: 3px solid var(--mud-palette-primary, #1976d2);
}

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

.zalo-unread-badge {
 position: absolute;
 top: -4px;
 right: -4px;
 min-width: 18px;
 height: 18px;
 padding: 0 6px;
 font-size: 11px;
 font-weight: 700;
 color: #fff;
 background: #f44336;
 border-radius: 9px;
 display: flex;
 align-items: center;
 justify-content: center;
}

.zalo-conv-content {
 flex: 1;
 min-width: 0;
 display: flex;
 flex-direction: column;
 gap: 4px;
}

.zalo-conv-name {
 font-weight: 600;
 font-size: 14px;
 color: #333;
 white-space: nowrap;
 overflow: hidden;
 text-overflow: ellipsis;
}

.zalo-conv-preview {
 font-size: 13px;
 color: #888;
 white-space: nowrap;
 overflow: hidden;
 text-overflow: ellipsis;
}

.zalo-conv-meta {
 display: flex;
 flex-direction: column;
 align-items: flex-end;
 gap: 4px;
 flex-shrink: 0;
}

.zalo-conv-time {
 font-size: 11px;
 color: #999;
}

/* Right Panel - Chat Area */
.zalo-chat-area {
 flex: 1;
 display: flex;
 flex-direction: column;
 min-width: 0;
}

.zalo-chat-header {
 display: flex;
 align-items: center;
 justify-content: space-between;
 padding: 12px 16px;
 border-bottom: 1px solid var(--mud-palette-lines-default, #e0e0e0);
 background: #fff;
}

.zalo-chat-header-info {
 display: flex;
 align-items: center;
 gap: 12px;
}

.zalo-chat-name {
 font-weight: 700;
 font-size: 16px;
 color: #333;
}

.zalo-chat-status {
 font-size: 12px;
 color: #888;
}

.zalo-chat-actions {
 display: flex;
 gap: 8px;
}

/* Messages Container */
.zalo-messages-container {
 flex: 1;
 overflow-y: auto;
 padding: 16px;
 display: flex;
 flex-direction: column;
 gap: 12px;
 background: #f5f5f5;
}

.zalo-message {
 display: flex;
 align-items: flex-end;
 gap: 8px;
 max-width: 70%;
}

.zalo-message.sent {
 align-self: flex-end;
 flex-direction: row-reverse;
}

.zalo-message.received {
 align-self: flex-start;
}

.zalo-message-bubble {
 max-width: 100%;
 padding: 10px 14px;
 border-radius: 16px;
 position: relative;
}

.zalo-message.sent .zalo-message-bubble {
 background: var(--mud-palette-primary, #1976d2);
 color: #fff;
 border-bottom-right-radius: 4px;
}

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

.zalo-msg-text {
 white-space: pre-wrap;
 word-break: break-word;
 font-size: 14px;
 line-height: 1.4;
}

.zalo-msg-image {
 max-width: 250px;
 border-radius: 8px;
 margin-top: 4px;
}

.zalo-msg-file {
 display: flex;
 align-items: center;
 gap: 8px;
 padding: 8px 12px;
 background: rgba(0, 0, 0, 0.05);
 border-radius: 8px;
 margin-top: 4px;
}

.zalo-msg-time {
 font-size: 10px;
 color: #999;
 text-align: right;
 margin-top: 4px;
}

.zalo-message.sent .zalo-msg-time {
 color: rgba(255, 255, 255, 0.8);
}

.zalo-msg-avatar {
 width: 32px;
 height: 32px;
 font-size: 12px;
 flex-shrink: 0;
 border-radius: 50%;
 overflow: hidden;
 display: flex;
 align-items: center;
 justify-content: center;
}

/* Load More Messages */
.zalo-load-more-container {
 display: flex;
 justify-content: center;
 padding: 8px;
}

.zalo-load-more-btn {
 border-radius: 16px;
 font-size: 12px;
}

/* Chat Input Area */
.zalo-chat-input-area {
 padding: 12px 16px;
 border-top: 1px solid var(--mud-palette-lines-default, #e0e0e0);
 background: #fff;
}

.zalo-chat-input-wrapper {
 display: flex;
 align-items: flex-end;
 gap: 8px;
}

.zalo-message-input {
 flex: 1;
}

.zalo-attach-btn {
 flex-shrink: 0;
}

/* Message Search Bar */
.zalo-message-search-bar {
 padding: 8px 16px;
 border-bottom: 1px solid var(--mud-palette-lines-default, #e0e0e0);
 background: #fff;
}

/* Loading More Indicator */
.zalo-loading-more {
 display: flex;
 align-items: center;
 gap: 8px;
 padding: 12px;
 justify-content: center;
 color: #666;
 font-size: 13px;
}

.zalo-searching-indicator {
 padding: 12px;
 text-align: center;
}

.zalo-no-messages {
 padding: 24px;
 text-align: center;
}

/* Upload Preview */
.zalo-upload-preview {
 position: relative;
 display: inline-block;
 margin: 8px 0;
}

.zalo-upload-thumb {
 max-width: 200px;
 max-height: 150px;
 border-radius: 8px;
 border: 1px solid var(--mud-palette-lines-default, #e0e0e0);
}

.zalo-upload-cancel {
 position: absolute;
 top: -8px;
 right: -8px;
 background: #fff;
 border-radius: 50%;
}

.zalo-upload-progress {
 margin-left: 8px;
}

/* File Message */
.zalo-msg-file-info {
 display: flex;
 flex-direction: column;
 gap: 2px;
}

.zalo-msg-filename {
 font-weight: 600;
 font-size: 13px;
}

.zalo-msg-filesize {
 font-size: 11px;
 color: #888;
}

.zalo-msg-download {
 margin-top: 4px;
}

/* Message Status */
.zalo-msg-status {
 font-size: 12px;
 color: #4fc3f7;
 margin-left: 4px;
}

.zalo-message.sent .zalo-msg-status {
 color: rgba(255, 255, 255, 0.8);
}

.zalo-msg-status.read {
 color: #4fc3f7;
}

/* Input Hints */
.zalo-input-hints {
 padding: 4px 0;
}

/* Empty State */
.zalo-empty-chat {
 flex: 1;
 display: flex;
 flex-direction: column;
 align-items: center;
 justify-content: center;
 gap: 12px;
 color: #999;
}

/* Responsive */
@media (max-width: 768px) {
 .zalo-messenger-layout {
 flex-direction: column;
 height: calc(100vh - 120px);
 }

 .zalo-conversation-list {
 width: 100%;
 max-width: none;
 height: 40%;
 min-height: 200px;
 border-right: none;
 border-bottom: 1px solid var(--mud-palette-lines-default, #e0e0e0);
 }

 .zalo-chat-area {
 height: 60%;
 }

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

 .zalo-upload-thumb {
 max-width: 150px;
 max-height: 100px;
 }
}

/* Scrollbar */
.zalo-conversation-items::-webkit-scrollbar,
.zalo-messages-container::-webkit-scrollbar {
 width: 6px;
}

.zalo-conversation-items::-webkit-scrollbar-thumb,
.zalo-messages-container::-webkit-scrollbar-thumb {
 background: rgba(0, 0, 0, 0.2);
 border-radius: 3px;
}

.zalo-conversation-items::-webkit-scrollbar-track,
.zalo-messages-container::-webkit-scrollbar-track {
 background: transparent;
}