:root {
  --airradar-blue: #0b80ff;
  --airradar-ink: #111820;
  --airradar-muted: #5d6875;
  --airradar-bg: #f4f7fb;
  --airradar-border: #d9e1ea;
  --airradar-error: #b42318;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--airradar-ink);
  background:
    radial-gradient(900px 420px at 0% -10%, rgba(11, 128, 255, 0.14), transparent 55%),
    radial-gradient(700px 360px at 100% 0%, rgba(11, 128, 255, 0.08), transparent 50%),
    var(--airradar-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}
main {
  width: min(420px, 100%);
  padding: 1.75rem 1.6rem 1.5rem;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  border: 1px solid var(--airradar-border);
  border-radius: 14px;
  box-shadow: 0 12px 32px rgba(17, 24, 32, 0.08);
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 0.35rem;
}
.brand img {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  object-fit: cover;
  border: 1px solid var(--airradar-border);
  flex: 0 0 auto;
}
h1 {
  margin: 0;
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.lede {
  margin: 0 0 1.35rem;
  color: var(--airradar-muted);
  font-size: 0.95rem;
  line-height: 1.45;
}
label {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.9rem;
  font-size: 0.88rem;
  font-weight: 650;
  color: #334155;
}
input {
  width: 100%;
  min-height: 2.5rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--airradar-border);
  border-radius: 8px;
  background: #fff;
  color: var(--airradar-ink);
  font: inherit;
}
input:focus {
  outline: 2px solid rgba(11, 128, 255, 0.35);
  border-color: rgba(11, 128, 255, 0.55);
}
button {
  width: 100%;
  min-height: 2.6rem;
  margin-top: 0.35rem;
  border: 0;
  border-radius: 8px;
  background: var(--airradar-blue);
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
button:hover { background: #0670e6; }
#error {
  display: none;
  margin: 0 0 0.9rem;
  color: var(--airradar-error);
  font-size: 0.9rem;
  font-weight: 600;
}
#error.is-visible { display: block; }