:root {
  --bg: var(--tg-theme-bg-color, #0f0f0f);
  --text: var(--tg-theme-text-color, #f1f1f1);
  --hint: var(--tg-theme-hint-color, #8a8a8a);
  --secondary: var(--tg-theme-secondary-bg-color, #1c1c1c);
  --button: var(--tg-theme-button-color, #2a86ff);
  --button-text: var(--tg-theme-button-text-color, #ffffff);
  --link: var(--tg-theme-link-color, #2a86ff);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.modes {
  display: flex;
  gap: 6px;
  padding: 8px;
  background: var(--secondary);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.mode {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--hint);
  font: inherit;
  cursor: pointer;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
}

.mode.active {
  background: var(--button);
  color: var(--button-text);
}

.chat {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.msg {
  max-width: 85%;
  padding: 8px 12px;
  border-radius: 14px;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.msg.user {
  align-self: flex-end;
  background: var(--button);
  color: var(--button-text);
  border-bottom-right-radius: 4px;
}

.msg.assistant {
  align-self: flex-start;
  background: var(--secondary);
  border-bottom-left-radius: 4px;
}

.msg.error {
  align-self: stretch;
  background: rgba(255, 80, 80, 0.15);
  color: #ff8080;
  font-size: 13px;
}

.msg.system {
  align-self: center;
  color: var(--hint);
  font-size: 12px;
  background: transparent;
  padding: 4px 0;
}

.composer {
  display: flex;
  gap: 6px;
  padding: 8px;
  background: var(--secondary);
  border-top: 1px solid rgba(255,255,255,0.06);
}

#input {
  flex: 1;
  resize: none;
  max-height: 120px;
  padding: 8px 12px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.1);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  outline: none;
}

#send {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: var(--button);
  color: var(--button-text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  align-self: flex-end;
}

#send:disabled {
  opacity: 0.5;
  cursor: default;
}