* { box-sizing: border-box; }
body { margin: 0; background: #f8f6f3; color: #6b5b73; font: 16px/1.6 system-ui, sans-serif; }
main { max-width: 760px; margin: 40px auto; padding: 24px; }
header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 48px; }
h1 { font-size: 30px; line-height: 1.3; }
label { display: block; margin-top: 32px; }
textarea { display: block; width: 100%; margin: 12px 0 20px; padding: 16px; border: 1px solid #e0d6d6; border-radius: 12px; background: #fff; color: #403647; font: 14px/1.5 monospace; resize: vertical; }
button, select { font: inherit; padding: 10px 18px; border-radius: 8px; border: 1px solid #6b5b73; }
button { background: #6b5b73; color: #faf6f0; cursor: pointer; }
button:disabled { opacity: .6; cursor: wait; }
output { display: block; margin-top: 24px; white-space: pre-wrap; overflow-wrap: anywhere; }
.explanation { margin-top: 40px; font-size: 14px; }