:root {
  --bg: #0f1115;
  --card: #181b22;
  --card2: #1f232c;
  --border: #2a2f3a;
  --text: #e8eaf0;
  --muted: #8b93a3;
  --accent: #4f7cff;
  --ok: #35c07d;
  --warn: #e5a23c;
  --err: #e5484d;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3f5f9; --card: #ffffff; --card2: #f5f7fb; --border: #dde3ee;
    --text: #1a2030; --muted: #6b7280; --accent: #3b66f0; --ok: #1d9e64; --warn: #c07f18; --err: #d13438;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.6 system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
}
#app { max-width: 520px; margin: 0 auto; padding: 18px 14px 40px; display: flex; flex-direction: column; gap: 12px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px; }
.center { text-align: center; }
h1 { font-size: 18px; margin: 0 0 4px; }
h2 { font-size: 15px; margin: 0 0 8px; }
p { margin: 6px 0; }
.muted { color: var(--muted); font-size: 13px; }
.small { font-size: 12px; }
.mono { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.ok { color: var(--ok); } .warn { color: var(--warn); } .err { color: var(--err); }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
input[type=text], input[type=password], input[type=number] {
  width: 100%; background: var(--card2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; font: inherit;
}
input:focus { outline: none; border-color: var(--accent); }
button {
  appearance: none; border: 1px solid var(--border); background: var(--card2); color: var(--text);
  border-radius: 10px; padding: 10px 16px; font: inherit; cursor: pointer; flex: 1;
}
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
button:disabled { opacity: .5; cursor: default; }
.phrase { font-size: 18px; letter-spacing: 1px; text-align: center; padding: 12px 8px; background: var(--card2); border: 1px dashed var(--border); border-radius: 10px; font-weight: 600; }
.kv { display: flex; justify-content: space-between; gap: 10px; padding: 5px 0; border-bottom: 1px dashed var(--border); }
.kv:last-child { border-bottom: none; }
.kv .k { color: var(--muted); }
.sess { padding: 9px 10px; background: var(--card2); border-radius: 10px; margin-bottom: 8px; }
.sess .t { font-weight: 600; font-size: 14px; }
.sess .m { color: var(--muted); font-size: 12px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); display: inline-block; margin-right: 6px; }
.dot.on { background: var(--ok); } .dot.off { background: var(--err); }
.spin { width: 26px; height: 26px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; margin: 10px auto; animation: r 1s linear infinite; }
@keyframes r { to { transform: rotate(360deg); } }
.banner { font-size: 13px; border-radius: 10px; padding: 8px 12px; background: var(--card2); border: 1px solid var(--border); }
.steps { display: flex; gap: 4px; margin: 6px 0; }
.steps span { flex: 1; height: 4px; border-radius: 2px; background: var(--border); }
.steps span.done { background: var(--accent); }