/* General resets */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #121212;
  color: #eee;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: #1f1f1f;
  padding: 40px 20px;
  text-align: center;
  border-bottom: 2px solid #e44;
}

h1 {
  font-size: 2.8rem;
  margin-bottom: 10px;
  color: #ff3b3b;
}

.slogan {
  font-size: 1.3rem;
  font-weight: 600;
  color: #bbb;
}

main {
  flex: 1;
  padding: 30px 20px;
  max-width: 700px;
  margin: 0 auto;
}

.intro p {
  margin-bottom: 16px;
  font-size: 1.15rem;
}

.final-line {
  font-weight: 700;
  color: #ff4f4f;
  margin-top: 30px;
}

.chat-demo {
  margin-top: 40px;
  background: #1e1e1e;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 0 12px #ff3b3b33;
}

.chat-demo label {
  font-weight: 600;
  margin-bottom: 8px;
  display: block;
}

#chatInput {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  border-radius: 8px;
  border: none;
  outline: none;
  margin-bottom: 10px;
  background: #2a2a2a;
  color: #eee;
}

#sendBtn {
  background: #ff3b3b;
  border: none;
  padding: 12px 20px;
  border-radius: 8px;
  color: white;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.25s ease;
}

#sendBtn:hover:not(:disabled) {
  background: #ff1a1a;
}

#sendBtn:disabled {
  opacity: 0.6;
  cursor: default;
}

#chatOutput {
  margin-top: 20px;
  max-height: 150px;
  overflow-y: auto;
  border-top: 1px solid #444;
  padding-top: 10px;
  font-size: 0.95rem;
}

.user-msg {
  color: #ff8a8a;
  margin-bottom: 6px;
}

.bot-msg {
  color: #ffa6a6;
  margin-bottom: 6px;
}

footer {
  text-align: center;
  padding: 14px 0;
  font-size: 0.85rem;
  background: #111;
  color: #777;
  border-top: 1px solid #333;
}