:root {
  --bg-main: #0f1727;
  --bg-card: rgba(24, 38, 59, 0.96);
  --line: #2f4666;
  --text: #e6eef8;
  --muted: #98acc7;
  --accent: #2797ff;
  --danger: #ff8b8b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 0%, #223b59 0%, transparent 40%),
    radial-gradient(circle at 85% 5%, #1d3552 0%, transparent 45%),
    linear-gradient(160deg, #0f1727, #0b1422 55%, #101c2d);
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.login-card {
  width: min(100%, 420px);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--bg-card);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.3);
  padding: 1.4rem;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0.45rem 0 0;
  font-size: 1.7rem;
}

.sub {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.alert {
  margin: 1rem 0 0;
  border: 1px solid rgba(255, 139, 139, 0.32);
  border-radius: 12px;
  background: rgba(209, 109, 109, 0.14);
  color: var(--danger);
  padding: 0.8rem 0.9rem;
  font-size: 0.92rem;
}

.login-form {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field span {
  color: var(--muted);
  font-size: 0.84rem;
}

.field input {
  border: 1px solid #476486;
  border-radius: 12px;
  background: #101d2f;
  color: var(--text);
  font-size: 0.98rem;
  padding: 0.8rem 0.9rem;
  outline: none;
}

.field input:focus {
  border-color: #5a84b0;
  box-shadow: 0 0 0 3px rgba(39, 151, 255, 0.14);
}

.submit-btn {
  border: 1px solid #2797ff;
  border-radius: 12px;
  background: linear-gradient(180deg, #2a9fff, #187fda);
  color: #fff;
  cursor: pointer;
  font-size: 0.98rem;
  font-weight: 700;
  padding: 0.85rem 1rem;
}