:root {
  color-scheme: dark;
  --bg: #0b0e14;
  --panel: #12161e;
  --stroke: #2a3140;
  --text: #e8ecf4;
  --muted: #8b95a8;
  --accent: #6cb6ff;
  --danger: #f07178;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at top, #151b28 0%, var(--bg) 55%);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

.login-card {
  width: min(420px, calc(100vw - 2rem));
  padding: 1.5rem 1.35rem 1.35rem;
  background: var(--panel);
  border: 1px solid var(--stroke);
  border-radius: 12px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

h1 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
}

.sub {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.88rem;
}

form {
  display: grid;
  gap: 0.85rem;
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.78rem;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--stroke);
  background: #0c1018;
  color: var(--text);
  font-size: 0.95rem;
}

input:focus {
  outline: 2px solid rgba(108, 182, 255, 0.35);
  border-color: var(--accent);
}

button {
  margin-top: 0.25rem;
  padding: 0.7rem 1rem;
  border: none;
  border-radius: 8px;
  background: linear-gradient(135deg, #4f8fd9, #6cb6ff);
  color: #081018;
  font-weight: 700;
  cursor: pointer;
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.error {
  margin: 0;
  color: var(--danger);
  font-size: 0.82rem;
}

.error.hidden { display: none; }