:root {
  --ink: #0f172a;
  --muted: #475569;
  --paper: #e8eef5;
  --card: #ffffff;
  --primary: #0284c7;
  --primary-deep: #0369a1;
  --bad: #ba1a1a;
  --font: "Plus Jakarta Sans", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 10% -10%, #bae6fd 0%, transparent 55%),
    radial-gradient(700px 380px at 100% 0%, #a7f3d0 0%, transparent 50%),
    linear-gradient(165deg, #f8fafc 0%, var(--paper) 100%);
}

.join-shell {
  width: min(26rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: 3.5rem 0 2rem;
}

.brand {
  display: inline-block;
  margin-bottom: 1.25rem;
}

.brand img {
  display: block;
  height: auto;
  width: min(11rem, 50vw);
}

h1 {
  margin: 0 0 0.4rem;
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0 0 1.5rem;
  color: var(--muted);
  line-height: 1.45;
  font-size: 0.98rem;
}

.join-form {
  display: grid;
  gap: 0.9rem;
  padding: 1.25rem 1.2rem 1.1rem;
  background: var(--card);
  border: 1px solid #dbe3ee;
  border-radius: 1rem;
  box-shadow: 0 10px 28px -16px rgba(15, 23, 42, 0.25);
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
}

input {
  font: inherit;
  padding: 0.7rem 0.8rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.65rem;
  background: #f8fafc;
}

input:focus {
  outline: 2px solid #7dd3fc;
  border-color: var(--primary);
  background: #fff;
}

button[type="submit"] {
  font: inherit;
  font-weight: 700;
  padding: 0.75rem 1rem;
  border: 0;
  border-radius: 0.7rem;
  color: #fff;
  background: linear-gradient(180deg, var(--primary), var(--primary-deep));
  cursor: pointer;
}

button[type="submit"]:disabled {
  opacity: 0.65;
  cursor: wait;
}

.status {
  min-height: 1.25rem;
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.status.err {
  color: var(--bad);
}

.foot {
  margin-top: 1.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.foot a {
  color: var(--primary-deep);
}