:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1c2333;
  --muted: #5b6478;
  --accent: #2b59c3;
  --ok: #2e9e6b;
  --err: #d64545;
  --border: #dde2ee;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151d;
    --card: #1b2030;
    --text: #e8ebf3;
    --muted: #9aa3b8;
    --border: #2c3348;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
header .brand { font-weight: 700; font-size: 1.1rem; }
header nav { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}
h1 { font-size: 1.5rem; margin: 0 0 12px; }
label { display: block; font-weight: 600; margin: 12px 0 4px; }
input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
}
button, .button {
  display: inline-block;
  margin-top: 16px;
  padding: 10px 18px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
}
button.link {
  background: none;
  color: var(--accent);
  padding: 0;
  margin: 0;
}
a { color: var(--accent); }
.muted { color: var(--muted); }
.error { color: var(--err); min-height: 1.5em; }
.success { color: var(--ok); }
.checks { list-style: none; padding: 0; margin: 0; }
.checks li { padding: 12px 0; border-top: 1px solid var(--border); }
.checks li:first-child { border-top: 0; }
.status { font-weight: 700; }
.status.ok { color: var(--ok); }
.status.ko { color: var(--err); }
.login { max-width: 400px; margin: 10vh auto 0; }