:root { --bg: #0e1a24; --fg: #e8eef4; --muted: #8fa6b8; --accent: #2a6f97; }
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--fg); font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 420px; margin: 0 auto; padding: 8vh 20px 24px; text-align: center; }
h1 { font-size: 30px; margin: 0 0 6px; }
.lead { color: var(--fg); font-size: 18px; margin: 0 0 26px; }
button { font: inherit; font-size: 22px; font-weight: 700; color: #fff; background: var(--accent); border: 0; border-radius: 14px; padding: 18px 28px; width: 100%; cursor: pointer; }
button:active { filter: brightness(1.2); }
.nota { color: var(--muted); font-size: 14px; margin-top: 26px; }
.qr img { background: #fff; border-radius: 12px; padding: 8px; max-width: 80vw; height: auto; }

.msg { min-height: 22px; margin: 14px 0 0; color: #ffd27a; font-size: 15px; }