:root {
  --bg: #0b1020;
  --card: #121a33;
  --muted: #9aa4c7;
  --accent: #5b7cff;
  --accent-2: #7a9dff;
  --error: #ff6b6b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(1200px 600px at 70% -10%, #1c2446 0%, transparent 60%), var(--bg);
  color: #e8ecff;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial;
}

.card {
  width: 100%;
  max-width: 420px;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border: 1px solid rgba(255,255,255,0.06);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 26px;
  box-shadow: 0 10px 35px rgba(0,0,0,0.4);
}

h1 {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .3px;
}

.sub {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13px;
}

label {
  font-size: 13px;
  color: #dfe6ff;
  display: block;
  margin: 12px 0 6px;
}

.input {
  width: 100%;
  background: #0f1630;
  color: #e8ecff;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  padding: 12px 12px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91,124,255,.15);
}

.btn {
  margin-top: 18px;
  width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border: 0;
  color: white;
  font-weight: 700;
  border-radius: 12px;
  padding: 12px 14px;
  cursor: pointer;
  transition: transform .04s ease, filter .2s ease;
}
.btn:hover { filter: brightness(1.05); }
.btn:active { transform: translateY(1px); }

.row {
  display: flex;
  gap: 10px;
}

.helper {
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.alert {
  margin: 10px 0 0;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13px;
  background: rgba(255, 107, 107, .1);
  border: 1px solid rgba(255, 107, 107, .35);
  color: #ffd8d8;
}