:root {
  --bg: #0d0f14;
  --panel: #151823;
  --border: #262b3a;
  --text: #e6e8ee;
  --muted: #8a90a3;
  --accent: #5b8cff;
  --danger: #ff6b6b;
  --ok: #4cd39a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.nav {
  display: flex;
  gap: 18px;
  align-items: center;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.nav .brand { font-weight: 600; color: var(--text); }
.nav a { color: var(--muted); }
.nav a:hover { color: var(--text); text-decoration: none; }
.container { max-width: 420px; margin: 0 auto; padding: 48px 20px; }
.container-wide { max-width: 640px; margin: 0 auto; padding: 48px 20px; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
}
.card + .card { margin-top: 20px; }
h1 { font-size: 22px; margin: 0 0 8px; }
.sub { color: var(--muted); font-size: 14px; margin: 0 0 22px; }
label { display: block; font-size: 13px; color: var(--muted); margin: 14px 0 6px; }
input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0f1219;
  color: var(--text);
  font-size: 14px;
}
input:focus { outline: none; border-color: var(--accent); }
button, .btn {
  display: inline-block;
  width: 100%;
  margin-top: 18px;
  padding: 11px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  cursor: pointer;
  text-align: center;
}
button:hover, .btn:hover { filter: brightness(1.1); text-decoration: none; }
.btn-secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
.msg { margin-top: 14px; font-size: 13px; min-height: 18px; }
.msg.err { color: var(--danger); }
.msg.ok { color: var(--ok); }
.links { margin-top: 18px; font-size: 13px; display: flex; justify-content: space-between; }
.oauth { display: flex; gap: 10px; }
.oauth .btn { margin-top: 12px; }
.row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.row .k { color: var(--muted); }
.row .v { word-break: break-all; text-align: right; }
.feature { padding: 14px 0; border-bottom: 1px solid var(--border); font-size: 14px; color: var(--muted); }
.feature b { color: var(--text); display: block; margin-bottom: 4px; font-weight: 600; }