:root { font-family: Arial, sans-serif; color: #202124; background: #f4f1ed; }
* { box-sizing: border-box; }
body { margin: 0; padding: 24px; }
.shell { max-width: 800px; margin: 0 auto; }
h1 { margin-bottom: 4px; color: #8c1d40; }
.subtitle { margin-top: 0; color: #555; }
.chat { min-height: 440px; max-height: 65vh; overflow-y: auto; padding: 20px; background: white; border-radius: 12px; box-shadow: 0 2px 10px #0001; }
.message { max-width: 85%; margin: 10px 0; padding: 12px 15px; border-radius: 12px; line-height: 1.5; white-space: pre-wrap; }
.assistant { background: #f0e8ec; margin-right: auto; }
.user { background: #8c1d40; color: white; margin-left: auto; }
.composer { display: flex; gap: 10px; margin-top: 14px; }
textarea { flex: 1; resize: vertical; padding: 12px; border: 1px solid #bbb; border-radius: 8px; font: inherit; }
button { align-self: end; padding: 12px 22px; border: 0; border-radius: 8px; background: #8c1d40; color: white; font-weight: bold; cursor: pointer; }
button:disabled { opacity: .6; cursor: wait; }
.hint { font-size: .9rem; color: #666; }