body {
  font-family: 'Segoe UI', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background-color: #0a1014;
  margin: 0;
  display: flex;
  height: 100vh;
  color: #e9edef;
  overflow: hidden;
}

.app-container {
  display: flex;
  width: 100%;
  height: 100%;
}

.activity-bar {
  width: 60px;
  min-width: 60px;
  background-color: #0c1317;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 10px;
  border-right: 1px solid #222d34;
  z-index: 20;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 10px;
  color: #aebac1;
  cursor: pointer;
  background: transparent;
  border: none;
  padding: 0;
}

.icon-btn:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

.icon-btn.active {
  background-color: #2a3942;
  color: #d1d7db;
}

.sidebar {
  width: 30%;
  min-width: 320px;
  max-width: 450px;
  background-color: #111b21;
  display: flex;
  flex-direction: column;
  border-right: 1px solid #222d34;
  z-index: 15;
}

.sidebar-header {
  height: 59px;
  min-height: 59px;
  background-color: #202c33;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  box-sizing: border-box;
}

.sidebar-title {
  font-size: 22px;
  font-weight: 600;
  color: #e9edef;
}

.sidebar-actions {
  display: flex;
  gap: 10px;
}

.sidebar-actions button {
  background: transparent;
  border: none;
  color: #aebac1;
  cursor: pointer;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.sidebar-actions button:hover {
  background-color: rgba(255,255,255,0.05);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background-color: #111b21;
}

.search-bar {
  background-color: #202c33;
  padding: 10px;
  border-radius: 8px;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
}

.search-bar input {
  background: transparent;
  border: none;
  color: #d1d7db;
  outline: none;
  width: 100%;
  font-family: inherit;
  font-size: 15px;
  margin-left: 10px;
}

.search-result-item {
  padding: 12px;
  border-bottom: 1px solid #222d34;
  cursor: pointer;
}
.search-result-item:hover {
  background-color: #202c33;
}
.search-result-name {
  font-weight: 500;
  margin-bottom: 4px;
  font-size: 15px;
}
.search-result-date {
  font-size: 12px;
  color: #8696a0;
  float: right;
}
.search-result-text {
  font-size: 14px;
  color: #aebac1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.control-group {
  margin-bottom: 25px;
  background-color: #202c33;
  padding: 15px;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.control-group label {
  display: block;
  margin-bottom: 12px;
  color: #00a884;
  font-weight: 500;
  font-size: 15px;
}

.control-group input[type="file"], .control-group select {
  width: 100%;
  background: #2a3942;
  color: #d1d7db;
  border: 1px solid #2a3942;
  padding: 10px;
  border-radius: 6px;
  outline: none;
  font-family: inherit;
  box-sizing: border-box;
  cursor: pointer;
}

.control-group select:focus {
  border-color: #00a884;
}

.main-chat {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  background-color: #0b141a;
  min-width: 0;
}

.chat-header {
  height: 59px;
  min-height: 59px;
  background-color: #202c33;
  display: flex;
  align-items: center;
  padding: 0 16px;
  box-sizing: border-box;
  z-index: 10;
  border-left: 1px solid #222d34;
}

.chat-header-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: #6a7175;
  margin-right: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.chat-title {
  font-size: 16px;
  font-weight: 500;
  color: #e9edef;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-background {
  position: absolute;
  top: 59px;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('https://user-images.githubusercontent.com/15075759/28719144-86dc0f70-73b1-11e7-911d-60d70fcded21.png');
  background-repeat: repeat;
  background-size: 412px;
  opacity: 0.06;
  z-index: 0;
}

#chat-container {
  flex: 1;
  padding: 20px 6%;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  z-index: 1;
}

::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-thumb {
  background-color: rgba(255,255,255,0.16);
  border-radius: 3px;
}

.date-divider-wrapper {
  display: flex;
  justify-content: center;
  margin: 12px 0;
  width: 100%;
}

.date-divider {
  background-color: #182229;
  color: #8696a0;
  font-size: 12.5px;
  padding: 5px 12px;
  border-radius: 7.5px;
  box-shadow: 0 1px 0.5px rgba(0,0,0,.13);
  text-transform: uppercase;
}

.message-wrapper {
  display: flex;
  margin-bottom: 2px;
  width: 100%;
}

.message {
  padding: 6px 7px 8px 9px;
  border-radius: 7.5px;
  max-width: 65%;
  position: relative;
  font-size: 14.2px;
  line-height: 19px;
  box-shadow: 0 1px 0.5px rgba(0,0,0,.13);
  word-wrap: break-word;
  color: #e9edef;
  contain: layout paint style;
}

.message-text {
  white-space: pre-wrap;
}

.message-spacer {
  display: inline-block;
  width: 75px;
  height: 10px;
}

.user-msg-wrapper {
  justify-content: flex-end;
}

.user-msg {
  background-color: #005c4b;
  border-top-right-radius: 0px;
}

.user-msg::before {
  content: "";
  position: absolute;
  top: 0;
  right: -8px;
  width: 8px;
  height: 13px;
  background: linear-gradient(135deg, #005c4b 0%, #005c4b 50%, transparent 50%, transparent);
}

.other-msg-wrapper {
  justify-content: flex-start;
}

.other-msg {
  background-color: #202c33;
  border-top-left-radius: 0px;
}

.other-msg::before {
  content: "";
  position: absolute;
  top: 0;
  left: -8px;
  width: 8px;
  height: 13px;
  background: linear-gradient(-135deg, #202c33 0%, #202c33 50%, transparent 50%, transparent);
}

.no-tail::before {
  display: none;
}
.user-msg.no-tail {
  border-top-right-radius: 7.5px;
}
.other-msg.no-tail {
  border-top-left-radius: 7.5px;
}

.sender-name {
  font-size: 12.8px;
  font-weight: 500;
  margin-bottom: 2px;
  display: block;
}
.user-msg .sender-name {
  display: none;
}

.timestamp {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.6);
  position: absolute;
  bottom: 4px;
  right: 7px;
}

@keyframes highlight {
  0% { background-color: rgba(0, 168, 132, 0.5); }
  100% { background-color: transparent; }
}
.highlight-flash {
  animation: highlight 2s ease-out;
}

.system-msg-wrapper {
  justify-content: center;
  margin: 12px 0;
}
.system-msg {
  background-color: #182229;
  color: #8696a0;
  font-size: 12.5px;
  padding: 5px 12px;
  border-radius: 7.5px;
  text-align: center;
  max-width: 85%;
  box-shadow: 0 1px 0.5px rgba(0,0,0,.13);
}

.msg-image {
  max-width: 100%;
  border-radius: 6px;
  margin-top: 4px;
  margin-bottom: 4px;
  display: block;
  cursor: pointer;
}
.msg-video {
  max-width: 100%;
  border-radius: 6px;
  margin-top: 4px;
  margin-bottom: 4px;
  display: block;
}

.chat-input-bar {
  height: 62px;
  background-color: #202c33;
  display: flex;
  align-items: center;
  padding: 5px 16px;
  box-sizing: border-box;
  z-index: 10;
}

.chat-input-placeholder {
  flex: 1;
  background-color: #2a3942;
  border-radius: 8px;
  height: 42px;
  display: flex;
  align-items: center;
  padding: 0 15px;
  color: #8696a0;
  font-size: 15px;
  margin: 0 10px;
}

.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0,0,0,0.9);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}
.lightbox img {
  max-width: 90%;
  max-height: 90%;
  border-radius: 8px;
  box-shadow: 0 0 20px rgba(0,0,0,0.5);
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 30px;
  color: white;
  font-size: 40px;
  cursor: pointer;
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0,0,0,0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}
.modal-content {
  background-color: #202c33;
  padding: 30px;
  border-radius: 8px;
  min-width: 300px;
  color: #e9edef;
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}
.modal-content h3 {
  margin-top: 0;
  color: #00a884;
}
.modal-close-btn {
  background-color: #00a884;
  color: #111b21;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 20px;
  font-weight: 600;
  width: 100%;
}
.modal-close-btn:hover {
  background-color: #018a6d;
}

.drag-active {
  border: 2px dashed #00a884 !important;
  background-color: rgba(0, 168, 132, 0.1) !important;
}

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

.chat-list-item {
  display: flex;
  align-items: center;
  padding: 10px 15px;
  cursor: pointer;
  border-bottom: 1px solid #202c33;
}

.chat-list-item:hover {
  background-color: #202c33;
}

.chat-list-item.active {
  background-color: #2a3942;
}

.chat-list-avatar {
  width: 49px;
  height: 49px;
  border-radius: 50%;
  background-color: #dfe5e7;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 15px;
  flex-shrink: 0;
  overflow: hidden;
}

.chat-list-avatar svg {
  fill: #fff;
  width: 30px;
  height: 30px;
}

.chat-list-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}

.chat-list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3px;
}

.chat-list-name {
  color: #e9edef;
  font-size: 17px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-list-time {
  color: #8696a0;
  font-size: 12px;
}

.chat-list-message {
  display: flex;
  align-items: center;
  color: #8696a0;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-banner {
  background-color: #202c33;
  padding: 10px 15px;
  border-bottom: 1px solid #2a3942;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 10;
}

.user-banner span {
  color: #e9edef;
  font-size: 14px;
}

.user-banner select {
  background: #2a3942;
  color: #d1d7db;
  border: none;
  padding: 5px;
  border-radius: 5px;
  outline: none;
}

.word-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 12px;
  background: #111b21;
  padding: 20px;
  border-radius: 8px;
  min-height: 150px;
}
.word-cloud span {
  display: inline-block;
  font-weight: 500;
  line-height: 1.2;
}

/* Language Toggle Button */
#btn-lang:hover #langLabel {
  background-color: #018a6d !important;
  color: #ffffff !important;
}