:root {
  color-scheme: dark;
  --bg: #0b1119;
  --surface: #111b27;
  --surface-strong: #172433;
  --text: #f4f8fc;
  --muted: #9eacba;
  --blue: #56a9ff;
  --blue-strong: #2f7cff;
  --border: #243548;
  --danger: #ff7a7a;
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  max-width: 48rem;
  min-height: 100vh;
  padding: 56px 22px 72px;
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 75% 0%, rgba(47, 124, 255, 0.17), transparent 34rem),
    var(--bg);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.brand img {
  width: 58px;
  height: 58px;
  object-fit: contain;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(2rem, 7vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.brand h1 { margin: 0; }
h2 { margin: 34px 0 10px; font-size: 1.2rem; }
p { margin: 0 0 15px; }
a { color: var(--blue); }
.lede { color: var(--muted); font-size: 1.15rem; }

.card {
  margin: 28px 0;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: linear-gradient(145deg, rgba(23, 36, 51, 0.98), rgba(15, 25, 36, 0.98));
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.22);
}

ul, ol { padding-left: 22px; }
li { margin-bottom: 8px; }

form { display: flex; gap: 10px; flex-wrap: wrap; }

input[type="email"] {
  flex: 1 1 240px;
  min-width: 0;
  padding: 13px 15px;
  border: 1px solid var(--border);
  border-radius: 11px;
  outline: none;
  color: var(--text);
  background: var(--bg);
  font: inherit;
}

input[type="email"]:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(86, 169, 255, 0.15);
}

button {
  padding: 13px 22px;
  border: 0;
  border-radius: 11px;
  color: #06101d;
  background: linear-gradient(135deg, #6bb8ff, var(--blue-strong));
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}

button:disabled { opacity: 0.6; cursor: default; }
#status { min-height: 1.5em; margin-top: 13px; font-size: 0.95rem; }
#status.ok { color: #79beff; }
#status.err { color: var(--danger); }
.back { display: inline-block; margin-bottom: 26px; font-size: 0.95rem; }
footer { margin-top: 44px; color: var(--muted); font-size: 0.9rem; }

@media (max-width: 520px) {
  body { padding-top: 38px; }
  button { width: 100%; }
}