:root {
  --bg-color: #f9f9f9;
  --sidebar-color: #2a2a2a;
  --bubble-user: #6c63ff;
  --bubble-ai: #e4e6f7;
  --text-color: #333333;
  --input-bg: #fafafa;
  --header-bg: #6c63ff;
}

/* Ocean Theme */
body.theme-ocean {
  --bg-color: #2e8bc0;
  --sidebar-color: #145374;
  --bubble-user: #0c2d48;
  --bubble-ai: #69a197;
  --text-color: #e0f7fa;
  --input-bg: #428ab0;
  --header-bg: #0c4767;
}

/* Sunset Theme */
body.theme-sunset {
  --bg-color: #ffddd2;
  --sidebar-color: #fc7753;
  --bubble-user: #fc7753;
  --bubble-ai: #f6e7db;
  --text-color: #6b4226;
  --input-bg: #fde8dc;
  --header-bg: #b9552d;
}

/* Forest Theme */
body.theme-forest {
  --bg-color: #e9f0db;
  --sidebar-color: #4a7c59;
  --bubble-user: #2a4d14;
  --bubble-ai: #cee1a0;
  --text-color: #30422b;
  --input-bg: #bdd58c;
  --header-bg: #3f672e;
}

/* Lavender Theme */
body.theme-lavender {
  --bg-color: #f3e9f5;
  --sidebar-color: #735d78;
  --bubble-user: #b58da8;
  --bubble-ai: #dfcee9;
  --text-color: #4b3e53;
  --input-bg: #d2b9d3;
  --header-bg: #9678a9;
}

body.light-mode {
  background-color: var(--bg-color);
  color: var(--text-color);
}

body.dark-mode {
  --bg-color: #121212;
  --sidebar-color: #1f1f1f;
  --bubble-user: #7a6fff;
  --bubble-ai: #2a2a2a;
  --text-color: #e7e7e7;
  --input-bg: #2b2b2b;
  --header-bg: #5848c2;
  
  background-color: var(--bg-color);
  color: var(--text-color);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  -webkit-user-select: none;
  user-select: none;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

#app {
  display: flex;
  width: 100vw;
  height: 100vh;
  max-width: 1024px;
  background: var(--bg-color);
  border-radius: 12px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
  overflow: hidden;
}

/* Sidebar */

.sidebar {
  background: var(--sidebar-color);
  color: #ddd;
  width: 280px;
  display: flex;
  flex-direction: column;
  padding: 20px;
  gap: 16px;
}

.sidebar-btn {
  background: #444;
  border: none;
  color: #ddd;
  padding: 10px 16px;
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease;
}
.sidebar-btn:hover {
  background: #555;
}

.sidebar-btn.active {
  background: var(--bubble-user);
  color: white;
}

.sidebar-section {
  margin-top: 12px;
  font-size: 0.9rem;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
}
.sidebar-section input[type="checkbox"] {
  margin-right: 8px;
}

.api-status {
  margin-top: 8px;
  font-size: 0.8rem;
  padding: 6px 8px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.12);
  color: #ddd;
}

.api-status.online {
  background: rgba(39, 174, 96, 0.3);
  color: #c9ffd8;
}

/* Chat container */

.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-color);
  position: relative;
}

.chat-header {
  background: var(--header-bg);
  color: white;
  font-weight: 700;
  font-size: 1.5rem;
  padding: 1rem 1.5rem;
  text-align: center;
  user-select: none;
  box-shadow: 0 3px 6px rgba(40, 40, 40, 0.2);
}

/* Messages list */

.messages {
  flex: 1;
  padding: 1rem 1.5rem;
  list-style: none;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #aaa transparent;
}

.messages::-webkit-scrollbar {
  width: 8px;
}
.messages::-webkit-scrollbar-thumb {
  background-color: #aaa;
  border-radius: 20px;
  border: 3px solid transparent;
}

/* Message bubbles */

.message {
  max-width: 75%;
  margin-bottom: 12px;
  padding: 12px 20px;
  border-radius: 22px;
  line-height: 1.4;
  position: relative;
  font-size: 1rem;
  white-space: pre-wrap;
  word-wrap: break-word;
  animation: fadeIn 0.3s ease forwards;
  color: var(--text-color);
}

.message.user {
  background: var(--bubble-user);
  color: white;
  margin-left: auto;
  border-bottom-right-radius: 4px;
}
.message.assistant {
  background: var(--bubble-ai);
  color: var(--text-color);
  margin-right: auto;
  border-bottom-left-radius: 4px;
}

.message-actions {
  display: flex;
  gap: 6px;
  margin-top: 6px;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.message:hover .message-actions {
  opacity: 1;
}

.message-action-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: inherit;
  font-size: 0.72rem;
  border-radius: 12px;
  padding: 2px 8px;
  cursor: pointer;
}

.message-action-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.message-action-btn.danger {
  border-color: rgba(255, 87, 87, 0.8);
}

.assistant-default {
  font-style: normal;
}

.assistant-friendly {
  font-style: italic;
  color: #4a8cff;
}

.assistant-formal {
  font-style: normal;
  font-weight: 700;
  color: #2f2f2f;
}

.assistant-casual {
  font-style: normal;
  color: #1a9e00;
}

.assistant-funny {
  font-style: italic;
  color: #d2691e;
  text-decoration: underline wavy orange;
}

/* Typing indicator */

.typing-indicator {
  padding: 10px 1.5rem;
  font-style: italic;
  color: #666;
  font-size: 0.95rem;
  -webkit-user-select: none;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--text-color);
}

.dots span {
  animation-name: blink;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-duration: 1.3s;
  font-weight: 700;
}
.dots span:nth-child(1) {
  animation-delay: 0;
}
.dots span:nth-child(2) {
  animation-delay: 0.2s;
}
.dots span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes blink {
  0%,
  100% {
    opacity: 0.2;
  }
  20%,
  80% {
    opacity: 1;
  }
}

/* Input form */

.input-form {
  display: flex;
  padding: 10px 1rem;
  border-top: 1px solid #ddd;
  background: var(--input-bg);
}

.input {
  flex: 1;
  resize: none;
  padding: 10px 14px;
  font-size: 1rem;
  border: 1.5px solid #ccc;
  border-radius: 24px;
  transition: border-color 0.3s ease;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  outline: none;
  max-height: 100px;
  background: var(--input-bg);
  color: var(--text-color);
}
.input:focus {
  border-color: var(--bubble-user);
}

.send-btn {
  background: var(--bubble-user);
  color: white;
  border: none;
  border-radius: 24px;
  padding: 0 20px;
  margin-left: 10px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.3s ease;
}
.send-btn:hover {
  background: var(--header-bg);
}

/* Search results */
.search-results {
  max-height: 200px;
  overflow-y: auto;
  margin-top: 8px;
}

.search-result-item {
  padding: 8px;
  background: #555;
  margin-bottom: 4px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
}

.search-result-item:hover {
  background: #666;
}

/* Quick replies */
.quick-replies {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 1rem;
  background: var(--input-bg);
  border-top: 1px solid #ddd;
}

.quick-reply-btn {
  background: var(--bubble-user);
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: 16px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.3s ease;
}

.quick-reply-btn:hover {
  background: var(--header-bg);
}

/* Emoji picker */
.emoji-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  margin-right: 8px;
  padding: 0;
}

.emoji-picker {
  position: absolute;
  bottom: 100%;
  left: 0;
  background: white;
  border: 1px solid #ccc;
  border-radius: 8px;
  padding: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  max-width: 300px;
  z-index: 1000;
}

.emoji-picker.hidden {
  display: none;
}

.emoji-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 4px;
}

.emoji-grid span {
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: background 0.2s;
}

.emoji-grid span:hover {
  background: #f0f0f0;
}

/* Message reactions */
.message-reactions {
  display: flex;
  gap: 4px;
  margin-top: 4px;
  opacity: 0;
  transition: opacity 0.3s;
}

.message:hover .message-reactions {
  opacity: 1;
}

.reaction-btn {
  background: transparent;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: background 0.2s;
}

.reaction-btn:hover {
  background: rgba(255,255,255,0.1);
}

.reaction-btn.active {
  background: var(--bubble-user);
  color: white;
}

/* Message timestamp */
.message-timestamp {
  font-size: 0.7rem;
  color: #888;
  margin-top: 2px;
}

/* Code highlighting */
.message code {
  background: #f4f4f4;
  padding: 2px 4px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
}

.message pre {
  background: #f4f4f4;
  padding: 8px;
  border-radius: 4px;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
}

.message pre code {
  background: none;
  padding: 0;
}

/* Settings modal */
.settings-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
}

.settings-content {
  background: var(--bg-color);
  color: var(--text-color);
  padding: 20px;
  border-radius: 8px;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
}

.settings-content h3 {
  margin-top: 0;
}

.settings-content label {
  display: block;
  margin: 10px 0 5px;
}

.settings-content input, .settings-content select {
  width: 100%;
  padding: 8px;
  margin-bottom: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  background: var(--input-bg);
  color: var(--text-color);
}

.settings-close {
  position: absolute;
  top: 10px;
  right: 10px;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-color);
}

/* Notifications */
.notification {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--bubble-user);
  color: white;
  padding: 12px 20px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  z-index: 3000;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Responsive */

@media screen and (max-width: 768px) {
  #app {
    flex-direction: column;
    max-width: 100vw;
    height: 100vh;
    border-radius: 0;
  }

  .sidebar {
    width: 100%;
    flex-direction: row;
    justify-content: space-around;
    padding: 10px 5px;
  }

  .chat-header {
    font-size: 1.2rem;
  }

  .quick-replies {
    padding: 8px;
  }

  .emoji-picker {
    max-width: 250px;
  }

  .emoji-grid {
    grid-template-columns: repeat(8, 1fr);
  }

  #theme-select {
    font-size: 0.9rem;
    padding: 6px;
  }

  .message-actions {
    opacity: 1;
  }
}