:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c1f24;
  --muted: #5d6470;
  --border: #d7dbe1;
  --primary: #2f5bea;
  --primary-hover: #2449c4;
  --danger-bg: #fdecec;
  --danger: #b42318;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --card: #1b1e24;
    --text: #e8eaee;
    --muted: #9aa1ad;
    --border: #2e333c;
    --primary: #5b7ff5;
    --primary-hover: #7894f7;
    --danger-bg: #3a1d1d;
    --danger: #f2a39b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  width: 100%;
  max-width: 400px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 28px;
}

.brand { font-weight: 700; color: var(--primary); margin-bottom: 20px; }
h1 { font-size: 22px; margin: 0 0 4px; }
.muted { color: var(--muted); margin: 0 0 20px; }
.small { font-size: 13px; }
code { font-size: 12px; word-break: break-all; }

label { display: block; font-weight: 500; margin: 14px 0 6px; }
input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: inherit;
  font: inherit;
}
input:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: transparent; }

button {
  width: 100%;
  margin-top: 20px;
  padding: 11px 14px;
  border-radius: 8px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button.primary { background: var(--primary); color: #fff; }
button.primary:hover { background: var(--primary-hover); }
button.secondary { background: transparent; border-color: var(--border); color: var(--text); margin-top: 10px; }
button.link { background: none; color: var(--muted); font-weight: 400; margin-top: 8px; padding: 4px; }
button.link:hover { color: var(--text); }

.alert {
  background: var(--danger-bg);
  color: var(--danger);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 8px;
}
.field-error { color: var(--danger); font-size: 13px; margin-top: 4px; }
.switch { text-align: center; margin: 20px 0 0; color: var(--muted); }
a { color: var(--primary); }
.scopes { padding-left: 20px; margin: 0 0 8px; }
.scopes li { margin: 6px 0; }
.hint { color: var(--muted); font-size: 13px; margin: 8px 0 0; }