:root {
  --bg: #f5f5f1;
  --surface: #ffffff;
  --ink: #1e1e1b;
  --muted: #5b5a54;
  --line: #d9d7cf;
  --accent: #2a5f8a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--ink);
  background: linear-gradient(160deg, #ecebe4 0%, var(--bg) 65%);
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 16px 40px;
  display: grid;
  gap: 14px;
}

header h1 {
  margin: 0;
}

header p {
  margin: 6px 0 0;
  color: var(--muted);
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
}

.chat-card {
  border-color: #9bb7cc;
  box-shadow: 0 10px 24px rgba(42, 95, 138, 0.12);
}

h2 {
  margin-top: 0;
}

.section-note {
  margin: -2px 0 10px;
  color: var(--muted);
  font-size: 0.95rem;
}

.row {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  margin-bottom: 8px;
}

.chat-row {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr auto;
  margin-bottom: 8px;
}

input,
textarea,
button {
  width: 100%;
  border: 1px solid #c9c6bd;
  border-radius: 8px;
  padding: 10px;
  font: inherit;
}

button {
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

pre {
  margin: 0;
  background: #f9f8f3;
  border: 1px solid #dddacf;
  border-radius: 8px;
  padding: 10px;
  min-height: 44px;
  max-height: 280px;
  overflow: auto;
}

#ai-output {
  min-height: 140px;
}

@media (max-width: 640px) {
  .chat-row {
    grid-template-columns: 1fr;
  }
}