:root {
  --bg: #f6f7f9;
  --fg: #1d2330;
  --muted: #6b7280;
  --card: #ffffff;
  --border: #e3e6eb;
  --accent: #2f5bea;
  --danger: #c0392b;
  --ok: #1e8e3e;
  --warn: #b7791f;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--fg);
  background: var(--bg);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b;
    --fg: #e6e8ec;
    --muted: #9aa3b2;
    --card: #1b2029;
    --border: #2b3240;
  }
}

body { margin: 0; }
main { max-width: 960px; margin: 0 auto; padding: 1.5rem; }
a { color: var(--accent); }
.muted { color: var(--muted); }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem 1.5rem; background: var(--card); border-bottom: 1px solid var(--border);
}
.topbar nav { display: flex; align-items: center; gap: 1rem; }
.topbar form { margin: 0; }
.brand { font-weight: 700; text-decoration: none; color: var(--fg); }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 1.25rem 1.5rem; }
.card.narrow { max-width: 420px; margin: 2rem auto; }
.heading-row { display: flex; align-items: center; justify-content: space-between; }

form label { display: block; margin-top: 0.75rem; font-size: 0.9rem; }
input[type=email], input[type=password], input[type=text] {
  width: 100%; box-sizing: border-box; padding: 0.55rem 0.7rem; margin-top: 0.25rem;
  border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--fg);
}
input[type=submit], button {
  margin-top: 1rem; padding: 0.5rem 1rem; border: 0; border-radius: 6px;
  background: var(--accent); color: white; cursor: pointer; font: inherit;
}
button.link { background: none; color: var(--accent); padding: 0; margin: 0; }
button.danger, .danger { color: var(--danger); }
td form, li form { margin: 0; display: inline; }
td button, li button { margin: 0; }

.flash { padding: 0.6rem 1rem; border-radius: 6px; }
.flash.alert { background: #fdecea; color: var(--danger); }
.flash.notice { background: #e8f5ec; color: var(--ok); }
.errors { color: var(--danger); }

.codes { list-style: none; padding: 0; display: grid; gap: 0.6rem; }
.code-row {
  display: grid; grid-template-columns: 1fr auto minmax(3rem, auto) auto; align-items: center; gap: 1rem;
  transition: border-color 0.2s;
  background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 0.9rem 1.2rem;
}
.code-row div { display: flex; flex-direction: column; }
.otp { font-size: 1.8rem; letter-spacing: 0.08em; font-variant-numeric: tabular-nums; user-select: all; }
.otp.masked { color: var(--muted); user-select: none; }
.code-row.revealed { border-color: var(--accent); }
.row-actions { display: flex; align-items: center; gap: 0.75rem; }
.row-actions button.reveal { margin: 0; min-width: 5rem; }

table.devices { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 10px; overflow: hidden; }
table.devices th, table.devices td { text-align: left; padding: 0.7rem 0.9rem; border-bottom: 1px solid var(--border); }
td.actions { display: flex; gap: 0.75rem; align-items: center; }

.badge { padding: 0.15rem 0.5rem; border-radius: 999px; font-size: 0.8rem; }
.badge.active { background: #e8f5ec; color: var(--ok); }
.badge.pending { background: #fdf3e1; color: var(--warn); }
.badge.revoked { background: #fdecea; color: var(--danger); }

.enrollment { text-align: center; }
.qr { background: white; padding: 0.5rem; border-radius: 8px; image-rendering: pixelated; }