:root {
  --bg: #f2f4f1; --surface: #ffffff; --line: #d4dbd5; --ink: #17211d; --muted: #5a6962;
  --primary: #1d5c48; --primary-ink: #ffffff; --primary-soft: #dcebe4; --danger: #b3261e; --accent-soft: #fbefd2;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1513; --surface: #161e1b; --line: #2b3732; --ink: #e5ece8; --muted: #9aa9a2;
    --primary: #63c3a0; --primary-ink: #08130f; --primary-soft: #1b3a30; --danger: #f2827a; --accent-soft: #3a2e12; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 "Hind Siliguri", system-ui, -apple-system, "Segoe UI", sans-serif; }
.top { display: flex; align-items: center; gap: 10px; padding: 14px 16px; max-width: 460px; margin: 0 auto; }
.mark { width: 36px; height: 36px; border-radius: 10px; background: var(--primary); color: var(--primary-ink); display: grid; place-items: center; font-size: 20px; }
.brand b { display: block; font-size: 18px; } .brand span { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
main { max-width: 460px; margin: 0 auto; padding: 8px 16px 40px; }
h1 { font-size: 26px; margin: 18px 0 6px; } h2 { font-size: 19px; margin: 26px 0 8px; }
p { margin: 6px 0 14px; color: var(--muted); }
.card { background: var(--surface); border-radius: 14px; padding: 18px; box-shadow: 0 1px 2px rgba(0,0,0,.06), 0 4px 14px rgba(0,0,0,.04); margin: 12px 0; }
.field { display: grid; gap: 4px; margin: 0 0 14px; font-weight: 600; font-size: 14px; }
.in { width: 100%; font: inherit; font-size: 17px; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); }
.in:focus { outline: 2px solid var(--primary); outline-offset: 1px; }
.btn { display: inline-block; width: 100%; font: inherit; font-weight: 700; font-size: 17px; padding: 12px; border: 0; border-radius: 12px; background: var(--primary); color: var(--primary-ink); cursor: pointer; text-align: center; text-decoration: none; }
.btn.ghost { background: var(--primary-soft); color: var(--ink); }
.btn.small { width: auto; font-size: 14px; padding: 7px 12px; border-radius: 9px; }
.note { padding: 10px 12px; border-radius: 10px; color: var(--ink); }
.note.bad { background: #fde8e6; color: #7d1a14; } .note.good { background: var(--primary-soft); }
@media (prefers-color-scheme: dark) { .note.bad { background: #3a1b18; color: #f6c1bc; } }
.mono { font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace; letter-spacing: .06em; word-break: break-all; }
.qr { display: grid; place-items: center; padding: 14px; background: #fff; border-radius: 12px; margin: 10px 0; }
.row { display: flex; gap: 10px; align-items: center; justify-content: space-between; padding: 10px 0; border-top: 1px solid var(--line); }
.row:first-child { border-top: 0; }
.row small { display: block; color: var(--muted); }
.in[name=code] { font-size: 26px; letter-spacing: .3em; text-align: center; }
a { color: var(--primary); }