:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #0f1720;
  --muted: #5d6b7a;
  --line: #e3e8ef;
  --accent: #3b8cf0;
  --accent-ink: #ffffff;
  --accent-soft: #e8f1fe;
  --danger: #c4372f;
  --radius: 14px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141b;
    --surface: #171e27;
    --text: #e8edf3;
    --muted: #93a1b0;
    --line: #26303c;
    --accent: #5aa2f7;
    --accent-ink: #0b1220;
    --accent-soft: #18283c;
    --danger: #f0716a;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
.shell { max-width: 520px; margin: 0 auto; padding: 24px 16px 48px; }
.top { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.mark { border-radius: 10px; }
h1 { font-size: 22px; margin: 0; letter-spacing: -0.01em; }
h2 { font-size: 17px; margin: 0 0 6px; }
.sub, .muted { color: var(--muted); }
.sub { margin: 0; font-size: 14px; }
.pill {
  margin-left: auto; font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 999px; white-space: nowrap; flex-shrink: 0;
  background: var(--accent-soft); color: var(--accent);
}
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; margin-bottom: 16px;
}
.card p { margin: 0 0 12px; }
.card p:last-child { margin-bottom: 0; }
.steps { margin: 0; padding-left: 20px; }
.steps li { margin: 4px 0; }
code { font: 14px ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--accent-soft); padding: 1px 5px; border-radius: 5px; }
form { display: grid; gap: 6px; margin-top: 8px; }
label { font-size: 13px; font-weight: 600; color: var(--muted); margin-top: 6px; }
input {
  font: inherit; font-size: 17px; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg); color: var(--text); width: 100%;
}
#code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 0.12em; text-transform: uppercase; font-size: 20px; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
button {
  font: inherit; font-weight: 600; border: 0; border-radius: 10px; padding: 13px 16px; cursor: pointer;
  background: var(--accent); color: var(--accent-ink); margin-top: 12px;
}
button[disabled] { opacity: 0.6; cursor: default; }
button.secondary { background: transparent; color: var(--danger); border: 1px solid var(--line); margin-top: 0; }
button.link { background: none; color: var(--accent); padding: 0; margin: 0; font-weight: 500; font-size: 14px; }
.error { color: var(--danger); font-size: 14px; margin: 6px 0 0 !important; }
.actions { display: flex; gap: 8px; }
.inbox { margin-top: 8px; }
.inbox-head { display: flex; align-items: baseline; justify-content: space-between; margin: 0 2px 8px; }
#inbox-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
#inbox-list li {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px;
}
#inbox-list a { color: inherit; text-decoration: none; display: block; }
.n-title { font-weight: 600; }
.n-body { color: var(--text); white-space: pre-wrap; overflow-wrap: anywhere; margin-top: 2px; }
.n-time { color: var(--muted); font-size: 12px; margin-top: 4px; }
.empty { margin: 4px 2px; }
[hidden] { display: none !important; }