* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; color: #1f2937; background: #f4f6f8; }
main { max-width: 720px; margin: 0 auto; padding: 24px 16px 48px; }
header h1 { margin: 0; font-size: 24px; color: #2e4a61; }
.sub { margin: 4px 0 24px; color: #5b6b79; }
.tarjeta { background: #fff; border-radius: 12px; padding: 18px; margin-bottom: 16px; box-shadow: 0 2px 10px rgba(33, 60, 84, .07); }
.tarjeta h2 { margin: 0 0 12px; font-size: 17px; }
.botones { display: flex; flex-wrap: wrap; gap: 8px; }
button { min-height: 42px; padding: 0 14px; border: none; border-radius: 9px; background: #405f79; color: #fff; font-weight: 700; cursor: pointer; }
button.secundario { margin-top: 10px; background: #fff; color: #405f79; border: 1px solid #405f79; }
button:disabled { opacity: .6; cursor: wait; }
pre { background: #f3f4f6; padding: 12px; border-radius: 8px; white-space: pre-wrap; word-break: break-word; font-size: 13px; }
.nota { font-size: 13px; color: #5b6b79; }