:root {
  --bg: #ffffff;
  --text: #000000;
  --card: #f3f3f3;
  --input-bg: #eaeaea;
  --bubble-user: #0078ff;
  --bubble-other: #d1d1d1;
  --button-bg: #0078ff;
  --button-text: #fff;
}

/* Karanlık tema */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --text: #ffffff;
    --card: #1e1e1e;
    --input-bg: #2b2b2b;
    --bubble-user: #0078ff;
    --bubble-other: #333;
    --button-bg: #0078ff;
    --button-text: #fff;
  }
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
}

.container {
  width: 90%;
  max-width: 600px;
  margin: 50px auto;
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
  padding: 20px;
  transition: background 0.3s ease, color 0.3s ease;
}

input, button {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  border-radius: 8px;
  border: none;
  outline: none;
  transition: background 0.3s ease, color 0.3s ease;
}

input {
  background: var(--input-bg);
  color: var(--text);
}

button {
  background: var(--button-bg);
  color: var(--button-text);
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  filter: brightness(0.9);
}

.chat-box {
  height: 400px;
  overflow-y: auto;
  background: var(--input-bg);
  padding: 10px;
  border-radius: 8px;
  margin-bottom: 10px;
}

.message {
  margin: 8px 0;
  padding: 10px;
  border-radius: 8px;
  max-width: 80%;
  word-wrap: break-word;
}

.user {
  background: var(--bubble-user);
  color: #fff;
  align-self: flex-end;
}

.other {
  background: var(--bubble-other);
}

.time {
  font-size: 0.75em;
  opacity: 0.7;
  margin-left: 5px;
}