:root {
  --bg: #0f1115;
  --card: #171a21;
  --border: #2a2f3a;
  --text: #e8eaed;
  --muted: #9aa3af;
  --accent: #4f7cff;
  --danger: #ff6b6b;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

.card {
  width: 100%;
  max-width: 380px;
  padding: 2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

h1 {
  margin: 0 0 1.5rem;
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.8125rem;
  color: var(--muted);
}

input {
  width: 100%;
  margin-bottom: 1.1rem;
  padding: 0.7rem 0.8rem;
  background: #0f1218;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
}

input:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  width: 100%;
  padding: 0.75rem;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

button:hover { filter: brightness(1.08); }

.error {
  margin: 1rem 0 0;
  color: var(--danger);
  font-size: 0.875rem;
  line-height: 1.4;
}