:root {
  --bg: #eef1f4;
  --surface: #ffffff;
  --ink: #15212c;
  --muted: #5d6b78;
  --line: #d6dde4;
  --accent: #1d5f86;
  --accent-ink: #ffffff;
  --used: #a3402f;
  --used-soft: #f6e4df;
  --ok: #2f7a4f;
  --font-body: "Figtree", "Segoe UI", system-ui, sans-serif;
  --font-code: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f151b; --surface: #18212a; --ink: #e4eaf0; --muted: #94a3b1;
    --line: #2a3642; --accent: #5aa7d4; --accent-ink: #0b1620;
    --used: #e48a77; --used-soft: #3a2420; --ok: #6cc596; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font-family: var(--font-body); font-size: 15px; line-height: 1.5; }
[hidden] { display: none !important; }
.wrap {
  max-width: 1100px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 20px 48px;
  display: grid; gap: 20px;
}
.loading { color: var(--muted); }

/* header */
.top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 10px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 1.05rem; letter-spacing: -0.01em; }
.who { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; font-size: 0.9rem; color: var(--muted); }
.who strong { color: var(--ink); }
.role { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); border: 1px solid currentColor; border-radius: 4px; padding: 1px 6px; margin-left: 6px; }
.link { font: inherit; background: none; border: 0; padding: 0; color: var(--accent); cursor: pointer; font-weight: 600; }

/* forms */
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 20px; display: grid; gap: 14px; min-width: 0; }
.auth { max-width: 380px; width: 100%; margin: 6vh auto 0; }
.auth h1 { margin: 0; font-size: 1.5rem; text-wrap: balance; }
.auth p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.field { display: grid; gap: 4px; }
.field label { font-size: 0.82rem; font-weight: 600; }
.field .hint { font-size: 0.78rem; color: var(--muted); }
input[type="text"], input[type="password"], select, textarea {
  font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line);
  border-radius: 7px; padding: 9px 11px; width: 100%; min-width: 0;
}
textarea { font-family: var(--font-code); font-size: 0.85rem; min-height: 120px; resize: vertical; }
.msg { font-size: 0.86rem; border-radius: 7px; padding: 9px 11px; }
.msg.error { background: var(--used-soft); color: var(--used); }
.msg.ok { background: color-mix(in srgb, var(--ok) 14%, transparent); color: var(--ok); }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; }
.row > .field { flex: 1 1 160px; }

.btn {
  font: inherit; font-size: 0.86rem; font-weight: 600; border-radius: 7px; padding: 8px 12px;
  cursor: pointer; border: 1px solid var(--line); background: transparent; color: var(--ink);
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.danger { color: var(--used); }
.btn.confirm { background: var(--used); border-color: var(--used); color: var(--surface); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
:is(.btn, .link, .seg button, .qr, .tabs button, input, select, textarea):focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* tabs and summary */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); }
.tabs button { font: inherit; font-weight: 600; font-size: 0.9rem; background: none; border: 0; border-bottom: 2px solid transparent; color: var(--muted); padding: 8px 12px; cursor: pointer; margin-bottom: -1px; }
.tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); }
.summary { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 14px; }
.tally { display: flex; align-items: baseline; gap: 6px; font-variant-numeric: tabular-nums; }
.tally strong { font-size: 1.5rem; }
.tally span { color: var(--muted); font-size: 0.9rem; }
.bar { height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; width: 200px; max-width: 100%; }
.bar > i { display: block; height: 100%; background: var(--used); transition: width .3s ease; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--surface); }
.seg button { font: inherit; font-size: 0.86rem; font-weight: 600; border: 0; background: transparent; color: var(--muted); padding: 7px 14px; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
details.panel > summary { cursor: pointer; font-weight: 600; }
details.panel[open] > summary { margin-bottom: 4px; }

/* code cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 14px; display: grid; gap: 10px; position: relative; min-width: 0; }
.card-top { display: flex; justify-content: space-between; align-items: center; font-size: 0.78rem; }
.idx { color: var(--muted); font-variant-numeric: tabular-nums; letter-spacing: 0.04em; }
.status { font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.7rem; color: var(--ok); }
.qr { display: block; width: 100%; aspect-ratio: 1; max-width: 100%; padding: 8px; border: 0; background: #ffffff; border-radius: 6px; cursor: zoom-in; }
.qr svg { width: 100%; height: 100%; display: block; }
.code { font-family: var(--font-code); font-weight: 700; font-size: 0.95rem; letter-spacing: 0.06em; overflow-wrap: anywhere; text-align: center; }
.meta { font-size: 0.75rem; color: var(--muted); text-align: center; min-height: 1.1em; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; }
.actions .btn { flex: 1 1 0; }
.actions .btn.primary { flex: 1 1 100%; }
.card.is-used { background: var(--used-soft); border-color: transparent; }
.card.is-used .status { color: var(--used); }
.card.is-used .qr { opacity: 0.35; }
.card.is-used .code { text-decoration: line-through; text-decoration-thickness: 2px; color: var(--muted); }
.stamp { position: absolute; left: 50%; top: 40%; transform: translate(-50%, -50%) rotate(-12deg); border: 3px solid var(--used); color: var(--used); font-weight: 700; font-size: 1.3rem; letter-spacing: 0.18em; padding: 2px 12px; border-radius: 6px; pointer-events: none; background: var(--used-soft); }
.empty { grid-column: 1 / -1; text-align: center; color: var(--muted); padding: 32px 0; }

/* users */
.users { display: grid; gap: 0; }
.user { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 0; border-top: 1px solid var(--line); }
.user:first-child { border-top: 0; }
.user .name { font-weight: 600; display: flex; align-items: center; flex-wrap: wrap; gap: 4px; }
.user .sub { font-size: 0.78rem; color: var(--muted); }
.user .tools { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.reset { display: flex; gap: 8px; flex-wrap: wrap; width: 100%; }
.reset input { flex: 1 1 180px; }
h2 { margin: 0; font-size: 1.05rem; }

/* overlay */
.overlay { position: fixed; inset: 0; background: rgba(8, 14, 20, 0.82); display: grid; place-items: center; padding: 24px max(16px, env(safe-area-inset-right, 0px)) 24px max(16px, env(safe-area-inset-left, 0px)); z-index: 20; }
.big { background: #ffffff; border-radius: 12px; padding: 20px; width: min(420px, 100%); display: grid; gap: 12px; }
.big svg { width: 100%; height: auto; display: block; }
.big .code { color: #15212c; font-size: 1.15rem; }
.big .btn { color: #15212c; border-color: #d6dde4; }

@media (prefers-reduced-motion: reduce) { .bar > i { transition: none; } }