/* CSS Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Variables (Telegram Web Colors - Refined) */
:root {
  --tg-bg-color: #f2f2f2; /* Slightly lighter background */
  --tg-sidebar-bg-color: #ffffff;
  --tg-chat-bg-color: #e5ddd5;
  --tg-text-color: #2a2a2a;
  --tg-link-color: #0088cc;
  --tg-sent-message-bg: #d9f0fd;
  --tg-received-message-bg: #ffffff;
  --tg-border-color: #e0e0e0;
  --tg-input-bg-color: #f9f9f9;
  --tg-input-border-color: #d9d9d9;
  --tg-input-placeholder-color: #9a9a9a;
  --tg-active-item-bg: #e8f4fd;
  --tg-hover-item-bg: #f8f8f8;

  /* Telegram Web Specific Refinements */
  --tg-message-radius: 12px; /* More rounded message corners */
  --tg-message-padding-vertical: 10px; /* Adjusted message padding */
  --tg-message-padding-horizontal: 14px;
  --tg-chat-item-avatar-size: 42px; /* Slightly larger avatars in chat list */
  --tg-chat-item-padding-vertical: 10px; /* Adjusted chat item padding */
  --tg-chat-item-padding-horizontal: 16px;
  --tg-header-height: 56px; /* Standard Telegram header height */
  --tg-input-height: 48px; /* Standard Telegram input height */
  --tg-scrollbar-width: 8px; /* Thinner scrollbar */
  --tg-scrollbar-color: rgba(0, 0, 0, 0.2); /* Scrollbar color */
  --tg-scrollbar-track-color: transparent; /* Scrollbar track color */
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: var(--tg-bg-color);
  overflow: hidden;
}

/* App Layout */
.app {
  display: flex;
  height: 100vh;
}

/* Chat List (Left Sidebar) */
.chat-list {
  width: 320px; /* Wider sidebar for better Telegram clone */
  background: var(--tg-sidebar-bg-color);
  border-right: 1px solid var(--tg-border-color);
  display: flex;
  flex-direction: column;
}

.chat-list-header {
  padding: 14px 16px;
  background: var(--tg-sidebar-bg-color);
  border-bottom: 1px solid var(--tg-border-color);
  display: flex;
  flex-direction: column;
}

.chat-list-header h2 {
  margin-bottom: 7px;
  font-size: 1.1em;
  color: var(--tg-text-color);
  font-weight: 500;
}

.chat-list-header button.connect-btn {
  width: 100%;
  padding: 8px 14px;
  border: 1px solid var(--tg-input-border-color);
  border-radius: 24px;
  outline: none;
  font-size: 0.95em;
  background-color: var(--tg-link-color);
  color: white;
  margin-bottom: 8px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.chat-list-header input {
  width: 100%;
  padding: 8px 14px;
  border: 1px solid var(--tg-input-border-color);
  border-radius: 24px;
  outline: none;
  font-size: 0.95em;
  background-color: var(--tg-input-bg-color);
  color: var(--tg-text-color);
  transition: border-color 0.2s;
}

.chat-list-header input:focus {
  border-color: var(--tg-link-color);
  box-shadow: 0 0 0 1px var(--tg-link-color);
}

.chat-items {
  list-style: none;
  overflow-y: auto;
  flex-grow: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--tg-scrollbar-color) var(--tg-scrollbar-track-color);
}
.chat-items::-webkit-scrollbar {
  width: var(--tg-scrollbar-width);
}
.chat-items::-webkit-scrollbar-track {
  background: var(--tg-scrollbar-track-color);
}
.chat-items::-webkit-scrollbar-thumb {
  background-color: var(--tg-scrollbar-color);
  border-radius: 4px;
}

.chat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--tg-chat-item-padding-vertical) var(--tg-chat-item-padding-horizontal);
  cursor: pointer;
  transition: background 0.2s;
  border-bottom: 1px solid var(--tg-border-color);
}

.chat-item.active {
  background: var(--tg-active-item-bg);
}

.chat-item:hover {
  background-color: var(--tg-hover-item-bg);
}

.chat-item .avatar {
  margin-right: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--tg-chat-item-avatar-size);
  height: var(--tg-chat-item-avatar-size);
  background: var(--tg-border-color);
  border-radius: 50%;
  font-weight: 600;
  font-size: 18px;
  color: var(--tg-chat-bg-color);
  overflow: hidden; /* Ensure content inside avatar stays within bounds */
}

.chat-item .avatar svg {
  width: 100%;
  height: 100%;
}

.chat-item .chat-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-grow: 1;
  margin-right: 10px;
}

.chat-name {
  font-weight: 500;
  margin-bottom: 3px;
  color: var(--tg-text-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 1.05em;
}

.chat-snippet {
  font-size: 0.9em;
  color: var(--tg-input-placeholder-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-item .chat-time {
  font-size: 0.8em;
  color: var(--tg-input-placeholder-color);
  align-self: flex-start;
}

.chat-item .unread-badge {
  background-color: var(--tg-link-color);
  color: white;
  font-size: 0.75em;
  padding: 4px 8px;
  border-radius: 12px;
  font-weight: bold;
  align-self: flex-end;
}

.chat-item .unread-badge.hidden {
  display: none;
}

.chat-item .channel-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.channel-users-count {
  font-size: 0.8em;
  color: var(--tg-input-placeholder-color);
}

/* Chat Window (Right Panel) */
.chat-window {
  flex-grow: 1;
  display: grid;
  grid-template-columns: 1fr 300px;
  grid-template-rows: var(--tg-header-height) 1fr auto;
  background: var(--tg-chat-bg-color);
  position: relative;
}

.chat-header {
  grid-column: 1 / -1;
  padding: 0 16px;
  height: var(--tg-header-height);
  background: var(--tg-sidebar-bg-color);
  border-bottom: 1px solid var(--tg-border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-header-info {
  display: flex;
  align-items: center;
}

.chat-header .avatar {
  width: 40px;
  height: 40px;
  font-size: 18px;
  margin-right: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #5288c1;
  border-radius: 50%;
  font-weight: 600;
  color: white;
}

.chat-header h2 {
  font-size: 1.1em;
  color: var(--tg-text-color);
  font-weight: 500;
}

.settings-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--tg-input-placeholder-color);
  transition: transform 0.3s;
}

.settings-btn:hover {
  transform: rotate(20deg);
}

.messages {
  grid-column: 1;
  padding-right: 300px;
  flex-grow: 1;
  overflow-y: auto;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--tg-scrollbar-color) var(--tg-scrollbar-track-color);
}
.messages::-webkit-scrollbar {
  width: var(--tg-scrollbar-width);
}
.messages::-webkit-scrollbar-track {
  background: var(--tg-scrollbar-track-color);
}
.messages::-webkit-scrollbar-thumb {
  background-color: var(--tg-scrollbar-color);
  border-radius: 4px;
}

/* Message bubbles */
.message {
  display: flex;
  max-width: 78%;
  animation: fadeIn 0.3s ease-in-out;
  margin-bottom: 3px;
}
.message.sent {
  align-self: flex-end;
}
.message.received {
  align-self: flex-start;
}
.message-bubble {
  padding: var(--tg-message-padding-vertical) var(--tg-message-padding-horizontal);
  border-radius: var(--tg-message-radius) calc(var(--tg-message-radius) * 2) calc(var(--tg-message-radius) * 2) var(--tg-message-radius);
  background: var(--tg-received-message-bg);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
  font-size: 0.98em;
  line-height: 1.3;
  position: relative;
  word-wrap: break-word;
}
.message.sent .message-bubble {
  background: var(--tg-sent-message-bg);
  color: var(--tg-text-color);
  border-radius: calc(var(--tg-message-radius) * 2) var(--tg-message-radius) var(--tg-message-radius) calc(var(--tg-message-radius) * 2);
}
.message.received .message-bubble {
  background: var(--tg-received-message-bg);
  padding: var(--tg-message-padding-vertical) var(--tg-message-padding-horizontal);
  border-radius: var(--tg-message-radius);
  max-width: 85%;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.message-time {
  position: absolute;
  right: 10px;
  bottom: 6px;
  font-size: 0.7em;
  color: var(--tg-input-placeholder-color);
}
.message.sent .message-time {
  right: 10px;
  left: auto;
  text-align: right;
}

/* Message input area */
.message-input {
  grid-column: 1;
  padding-right: 300px;
  display: flex;
  padding: 9px 16px;
  background: var(--tg-sidebar-bg-color);
  border-top: 1px solid var(--tg-border-color);
  height: var(--tg-input-height);
}
.message-input input {
  flex-grow: 1;
  padding: 10px 16px;
  border: 1px solid var(--tg-input-border-color);
  border-radius: 24px;
  outline: none;
  font-size: 1em;
  margin-right: 10px;
  background-color: var(--tg-input-bg-color);
  color: var(--tg-text-color);
  height: auto;
  transition: border-color 0.2s;
}

.message-input input:focus {
  border-color: var(--tg-link-color);
  box-shadow: 0 0 0 1px var(--tg-link-color);
}

.message-input input::placeholder {
  color: var(--tg-input-placeholder-color);
}
.message-input button {
  background: transparent;
  border: none;
  padding: 0;
  width: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--tg-link-color);
}

/* Bot command buttons */
.bot-commands {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0;
  padding: 0 16px;
}
.bot-command {
  background: var(--tg-sidebar-bg-color);
  border: none;
  padding: 8px 16px;
  border-radius: 18px;
  cursor: pointer;
  color: var(--tg-link-color);
  font-size: 0.95em;
  transition: background-color 0.2s;
}
.bot-command:hover {
  background: var(--tg-active-item-bg);
}

/* Bot keyboard and verification badge */
.bot-keyboard {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}
.keyboard-row {
  display: flex;
  gap: 8px;
}
.keyboard-button {
  flex: 1;
  background: var(--tg-sidebar-bg-color);
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--tg-link-color);
  font-size: 0.95em;
  transition: background-color 0.2s;
  text-align: center;
}
.keyboard-button:hover {
  background: var(--tg-active-item-bg);
}
.bot-badge {
  background: var(--tg-link-color);
  color: white;
  font-size: 0.7em;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 8px;
  text-transform: uppercase;
}

/* Fade In Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(3px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Dialog styles */
.dialog {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.dialog-content {
  background: var(--tg-sidebar-bg-color);
  padding: 24px;
  border-radius: 16px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
}
.dialog h3 {
  margin: 0 0 24px;
  color: var(--tg-text-color);
  font-size: 1.3em;
  font-weight: 500;
}
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  margin-bottom: 6px;
  color: var(--tg-text-color);
  font-size: 0.95em;
}
.form-group input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--tg-input-border-color);
  border-radius: 10px;
  font-size: 1em;
  background: var(--tg-input-bg-color);
  color: var(--tg-text-color);
  transition: border-color 0.2s;
}

.form-group input:focus {
  border-color: var(--tg-link-color);
  box-shadow: 0 0 0 1px var(--tg-link-color);
}

.buttons {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 24px;
}
.buttons button {
  padding: 10px 20px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.95em;
  transition: background-color 0.2s;
}
.buttons button[type="submit"] {
  background: var(--tg-link-color);
  color: white;
}
.buttons button.cancel {
  background: var(--tg-hover-item-bg);
  color: var(--tg-text-color);
}
.message-sender {
  display: block;
  font-weight: 500;
  margin-bottom: 4px;
  color: var(--tg-link-color);
}
.message.action {
  align-self: center;
  font-style: italic;
  color: var(--tg-input-placeholder-color);
}
.message.system {
  align-self: center;
  color: var(--tg-input-placeholder-color);
  font-size: 0.9em;
}
.message.error {
  align-self: center;
  color: #ff4444;
  font-size: 0.9em;
}
.header-actions {
  display: flex;
  gap: 10px;
}
.connect-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--tg-input-placeholder-color);
  transition: transform 0.3s;
}
.connect-btn:hover {
  transform: scale(1.1);
}

/* User List */
.user-list {
  grid-column: 2;
  grid-row: 2 / span 2;
  position: relative;
  width: 300px;
  background: var(--tg-sidebar-bg-color);
  border-left: 1px solid var(--tg-border-color);
  display: flex;
  flex-direction: column;
}

.user-list-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--tg-border-color);
  display: flex;
}
.user-list-header h3 {
  font-size: 1em;
  font-weight: 500;
  color: var(--tg-text-color);
}
.user-list-header input.user-search-input {
  padding: 8px 14px;
  border: 1px solid var(--tg-input-border-color);
  border-radius: 24px;
  outline: none;
  font-size: 0.95em;
  background-color: var(--tg-input-bg-color);
  color: var(--tg-text-color);
  margin-left: auto;
  width: 60%;
}

.user-list-content {
  overflow-y: auto;
  flex-grow: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--tg-scrollbar-color) var(--tg-scrollbar-track-color);
}
.user-list-content::-webkit-scrollbar {
  width: var(--tg-scrollbar-width);
}
.user-list-content::-webkit-scrollbar-track {
  background: var(--tg-scrollbar-track-color);
}
.user-list-content::-webkit-scrollbar-thumb {
  background-color: var(--tg-scrollbar-color);
  border-radius: 4px;
}

.user-item {
  display: flex;
  align-items: center;
  padding: 10px 16px;
  cursor: pointer;
  transition: background 0.2s;
}
.user-item:hover {
  background: var(--tg-hover-item-bg);
}
.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--tg-link-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 12px;
  font-weight: 500;
  font-size: 1em;
  overflow: hidden; /* Ensure content inside avatar stays within bounds */
}

.user-avatar svg {
  width: 100%;
  height: 100%;
}

.user-name {
  color: var(--tg-text-color);
  font-size: 0.95em;
}

/* Channel Topic */
.channel-topic {
  font-size: 0.8em;
  color: var(--tg-input-placeholder-color);
  margin-top: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Server Info */
.server-info {
  padding: 8px 16px;
  font-size: 0.8em;
  color: var(--tg-input-placeholder-color);
  background: var(--tg-sidebar-bg-color);
  border-bottom: 1px solid var(--tg-border-color);
}

/* Connection Status */
.connection-status {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 18px;
  background: var(--tg-link-color);
  color: white;
  border-radius: 0 0 10px 10px;
  font-size: 0.9em;
  z-index: 1000;
  transition: transform 0.3s;
}
.connection-status.hidden {
  transform: translateX(-50%) translateY(-100%);
}

/* Private Message Dialog */
.pm-dialog {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 320px;
  background: var(--tg-sidebar-bg-color);
  border-radius: 16px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  display: flex; /* Enable flexbox for PM dialog */
  flex-direction: column; /* Stack header, messages, input vertically */
  max-height: 80vh; /* Limit height to viewport height */
}
.pm-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--tg-border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0; /* Prevent header from shrinking */
}
.pm-messages {
  height: auto; /* Adjust height automatically based on content */
  overflow-y: auto;
  padding: 14px 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--tg-scrollbar-color) var(--tg-scrollbar-track-color);
  flex-grow: 1; /* Allow messages to take up available space */
  display: flex;
  flex-direction: column-reverse; /* Newest messages at bottom */
}
.pm-messages::-webkit-scrollbar {
  width: var(--tg-scrollbar-width);
}
.pm-messages::-webkit-scrollbar-track {
  background: var(--tg-scrollbar-track-color);
}
.pm-messages::-webkit-scrollbar-thumb {
  background-color: var(--tg-scrollbar-color);
  border-radius: 4px;
}
.pm-input {
  padding: 14px 16px;
  border-top: 1px solid var(--tg-border-color);
  flex-shrink: 0; /* Prevent input from shrinking */
}
.pm-input input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--tg-input-border-color);
  border-radius: 24px;
  outline: none;
  font-size: 1em;
  background-color: var(--tg-input-bg-color);
  color: var(--tg-text-color);
  transition: border-color 0.2s;
}

.pm-input input:focus {
  border-color: var(--tg-link-color);
  box-shadow: 0 0 0 1px var(--tg-link-color);
}
.pm-message {
  margin-bottom: 8px; /* Spacing between PM messages */
}

/* Settings Panel */
.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 320px;
  background: var(--tg-sidebar-bg-color);
  border-left: 1px solid var(--tg-border-color);
  transform: translateX(100%);
  transition: transform 0.3s;
  z-index: 1000;
}
.settings-panel.open {
  transform: translateX(0);
}
.settings-header {
  padding: 16px;
  border-bottom: 1px solid var(--tg-border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.settings-content {
  padding: 16px;
}
.settings-group {
  margin-bottom: 20px;
}
.settings-group h3 {
  margin-bottom: 12px;
  font-size: 1em;
  font-weight: 500;
}

/* Utility class to hide elements */
.hidden {
  display: none;
}

/* Channel search improvements */
.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--tg-sidebar-bg-color);
  border: 1px solid var(--tg-border-color);
  border-radius: 0 0 12px 12px;
  max-height: 320px;
  overflow-y: auto;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.search-result-item {
  padding: 12px 16px;
  border-bottom: 1px solid var(--tg-border-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.search-result-item:hover {
  background: var(--tg-hover-item-bg);
}

.join-button {
  padding: 8px 16px;
  background: var(--tg-link-color);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.join-button:hover {
  opacity: 0.9;
}

/* Section headers */
.section-header {
  padding: 10px 16px;
  font-weight: 500;
  color: var(--tg-input-placeholder-color);
  background: var(--tg-hover-item-bg);
  font-size: 0.9em;
}

/* Channel categories */
.channel-category {
  margin-bottom: 10px;
}

/* Loading indicator */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--tg-border-color);
  border-radius: 50%;
  border-top-color: var(--tg-link-color);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Theme switcher */
.theme-switcher {
  padding: 12px 16px;
  background: var(--tg-sidebar-bg-color);
  border-top: 1px solid var(--tg-border-color);
}

.theme-option {
  display: flex;
  align-items: center;
  padding: 8px 0;
  cursor: pointer;
}

.theme-option label {
  font-size: 0.95em;
}

.theme-option input[type="radio"] {
  margin-right: 8px;
}

/* Channel Info Styles */
.channel-info {
  display: flex;
  flex-direction: column;
  position: relative;
  background: var(--tg-sidebar-bg-color);
  border-top: 1px solid var(--tg-border-color);
  height: 100%;
}

.channel-info.hidden {
  display: none;
}

.channel-info-header {
  display: flex;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--tg-border-color);
}

.channel-info-header h3 {
  font-size: 1em;
  font-weight: 500;
  color: var(--tg-text-color);
}

.back-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--tg-input-placeholder-color);
  transition: transform 0.3s;
}

.back-btn:hover {
  transform: scale(1.1);
}

.channel-info-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  padding: 14px;
  height: calc(100% - 72px); /* Adjust height based on header height */
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--tg-scrollbar-color) var(--tg-scrollbar-track-color);
}
.channel-info-content::-webkit-scrollbar {
  width: var(--tg-scrollbar-width);
}
.channel-info-content::-webkit-scrollbar-track {
  background: var(--tg-scrollbar-track-color);
}
.channel-info-content::-webkit-scrollbar-thumb {
  background-color: var(--tg-scrollbar-color);
  border-radius: 4px;
}

.channel-topic {
  margin-bottom: 10px;
  font-size: 0.8em;
  color: var(--tg-input-placeholder-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* User Search Input in Channel Info */
.user-search-input {
  padding: 8px 14px;
  border: 1px solid var(--tg-input-border-color);
  border-radius: 24px;
  outline: none;
  font-size: 0.95em;
  background-color: var(--tg-input-bg-color);
  color: var(--tg-text-color);
  margin-bottom: 10px;
  width: 100%;
}