:root { color-scheme: light; font-family: Arial, 'Malgun Gothic', sans-serif; background: #f7f8fb; color: #18202f; }
body { margin: 0; }
.shell { width: min(960px, calc(100% - 32px)); margin: 0 auto; padding: 40px 0; }
.hero { padding: 28px 0 20px; border-bottom: 1px solid #d8deea; }
.eyebrow { margin: 0 0 10px; color: #1d6f5f; font-weight: 700; }
h1 { margin: 0; font-size: clamp(30px, 5vw, 52px); line-height: 1.06; letter-spacing: 0; }
.notice { max-width: 760px; font-size: 17px; line-height: 1.7; }
.chat-panel { margin-top: 24px; background: #ffffff; border: 1px solid #d9e0ec; border-radius: 8px; overflow: hidden; }
.log { min-height: 280px; padding: 18px; display: grid; gap: 12px; align-content: start; }
.bubble { max-width: 78%; padding: 12px 14px; border-radius: 8px; line-height: 1.55; }
.user { justify-self: end; background: #dbeafe; }
.bot { justify-self: start; background: #eef2f7; }
.composer { display: grid; grid-template-columns: 1fr auto; gap: 10px; padding: 14px; border-top: 1px solid #d9e0ec; }
input { min-width: 0; padding: 12px; border: 1px solid #b8c2d3; border-radius: 6px; font-size: 16px; }
button { padding: 0 18px; border: 0; border-radius: 6px; background: #1f6f63; color: white; font-weight: 700; }
.guardrails { margin-top: 24px; }
.guardrails li { margin: 8px 0; }
@media (max-width: 560px) { .composer { grid-template-columns: 1fr; } .bubble { max-width: 100%; } }