:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #16181d;
  --muted: #5d6470;
  --border: #e2e5ea;
  --accent: #2f6fed;
  --accent-text: #ffffff;
  --danger: #c93b3b;
  --ok: #1f8a4c;
  --code-bg: #eef1f5;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --surface: #1a1d23;
    --text: #e8eaee;
    --muted: #9aa2ae;
    --border: #2c3139;
    --accent: #5b8cff;
    --accent-text: #0b0d10;
    --danger: #ef6b6b;
    --ok: #4cc083;
    --code-bg: #242830;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 64px; }
header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 24px; }
header h1 { font-size: 20px; margin: 0; letter-spacing: -0.01em; }
header h1 a { color: inherit; text-decoration: none; }
header .who { color: var(--muted); font-size: 14px; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 20px; margin-bottom: 16px; }
.card h2 { font-size: 16px; margin: 0 0 12px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
label { display: block; font-size: 13px; color: var(--muted); margin: 10px 0 4px; }
input {
  width: 100%; padding: 9px 11px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
}
input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
button {
  font: inherit; font-weight: 600; padding: 9px 16px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--accent); background: var(--accent); color: var(--accent-text);
}
button.secondary { background: transparent; color: var(--text); border-color: var(--border); font-weight: 500; }
button.danger { background: transparent; color: var(--danger); border-color: var(--border); font-weight: 500; }
button.link { background: none; border: none; color: var(--accent); padding: 0; font-weight: 500; }
button:disabled { opacity: .55; cursor: default; }
.row { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.row > .grow { flex: 1 1 200px; }
.actions { margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap; }
.tabs { display: flex; gap: 4px; margin-bottom: 8px; border-bottom: 1px solid var(--border); }
.tabs button { background: none; border: none; color: var(--muted); border-bottom: 2px solid transparent; border-radius: 0; padding: 8px 12px; font-weight: 500; }
.tabs button.active { color: var(--text); border-bottom-color: var(--accent); }
.msg { margin-top: 12px; font-size: 14px; min-height: 1em; }
.msg.error { color: var(--danger); }
.msg.ok { color: var(--ok); }
.list { list-style: none; padding: 0; margin: 0; }
.list li { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 0; border-top: 1px solid var(--border); }
.list li:first-child { border-top: none; }
.list .meta { font-size: 13px; color: var(--muted); }
.badge { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--border); color: var(--muted); margin-left: 6px; }
.badge.bad { color: var(--danger); }
code, pre { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: 13px; background: var(--code-bg); border-radius: 6px; }
code { padding: 1px 5px; }
pre { padding: 12px; overflow-x: auto; white-space: pre-wrap; word-break: break-all; }
.center { text-align: center; }
.code-big { font: 600 28px/1.2 ui-monospace, Consolas, monospace; letter-spacing: .08em; }
.qr { display: inline-block; background: #fff; padding: 12px; border-radius: 12px; }
.qr svg { display: block; width: 260px; height: 260px; }
.hidden { display: none !important; }
footer { margin-top: 32px; font-size: 13px; color: var(--muted); text-align: center; }
footer a { color: var(--muted); }