:root {
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  color-scheme: dark;
  --bg: #10161d;
  --panel: #1b242e;
  --border: #354454;
  --text: #eef4f8;
  --muted: #9cacba;
  --accent: #42a5f5;
  --danger: #ff9898;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 22px;
  background:
    radial-gradient(circle at 50% 30%, #26394a 0, #10161d 58%, #0a0f14 100%);
  color: var(--text);
}

.auth-card {
  width: min(460px, 100%);
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(27, 36, 46, .96);
  box-shadow: 0 22px 55px rgba(0,0,0,.4);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}

.logo {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, #1769aa, #42a5f5);
  font-weight: 900;
}

h1 {
  margin: 0;
  font-size: 23px;
}

.subtitle {
  margin: 5px 0 0;
  color: var(--muted);
}

form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #10171e;
  color: var(--text);
  font: inherit;
}

button {
  margin-top: 5px;
  padding: 11px 14px;
  border: 1px solid #56b4ff;
  border-radius: 8px;
  background: #1769aa;
  color: white;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

button:disabled {
  opacity: .55;
  cursor: wait;
}

.message {
  min-height: 20px;
  margin: 4px 0 0;
  color: var(--danger);
  font-size: 13px;
}

.note {
  margin-top: 18px;
  padding: 11px;
  border-left: 4px solid #69c779;
  background: #15261b;
  color: #cdebd3;
  font-size: 12px;
  line-height: 1.45;
}