:root {
  --bg: #f6f2ea;
  --card: #fffdf8;
  --ink: #2e1f11;
  --gold: #8f6a2a;
  --soft: #efe3ce;
  --user: #d9ead3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans Khmer", "Battambang", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top, #fff3d6 0, var(--bg) 40%);
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
}

.card {
  width: 100%;
  max-width: 760px;
  background: var(--card);
  border-radius: 18px;
  box-shadow: 0 10px 30px rgba(80, 56, 23, 0.18);
  padding: 18px;
}

.header h1 {
  margin: 0;
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  color: var(--gold);
}

.header p {
  margin: 6px 0 0;
  opacity: 0.85;
}

.chat-box {
  margin-top: 16px;
  max-height: 48vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 4px;
}

.bubble {
  padding: 12px;
  border-radius: 12px;
  line-height: 1.55;
  background: var(--soft);
}

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

.bubble.assistant {
  align-self: flex-start;
}

.chat-form {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.grid {
  display: grid;
  gap: 10px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.95rem;
}

input,
textarea,
button {
  font: inherit;
  border-radius: 10px;
}

input,
textarea {
  width: 100%;
  border: 1px solid #d8c8ab;
  padding: 10px;
  background: #fff;
}

button {
  border: 0;
  padding: 12px;
  color: #fff;
  background: linear-gradient(120deg, #8f6a2a, #ac8642);
  cursor: pointer;
}

button:hover {
  filter: brightness(1.05);
}

@media (min-width: 700px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}