* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

/* BACKGROUND WEBSITE */
body {
  background: linear-gradient(135deg, #0f172a, #020617);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* APP CONTAINER */
.app {
  width: 100%;
  max-width: 900px;        /* WEBSITE WIDTH */
  height: 90vh;
  background: #020617;
  display: flex;
  flex-direction: column;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,0.6);
}

/* HEADER */
.header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: #020617;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  color: white;
  font-weight: 600;
}

.logo {
  width: 30px;
  height: 30px;
}

/* CHAT AREA */
.chat {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
}

/* MESSAGE */
.message {
  max-width: 75%;
  padding: 12px 16px;
  border-radius: 16px;
  margin-bottom: 14px;
  font-size: 14px;
  line-height: 1.5;
}

.message.bot {
  background: #1e293b;
  color: #e5e7eb;
}

.message.user {
  background: linear-gradient(135deg, #6366f1, #3b82f6);
  color: white;
  margin-left: auto;
}

/* INPUT AREA */
.input-area {
  display: flex;
  gap: 10p