* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  color: #1f2937;
  background: #f3f4f6;
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}

.auth-card {
  width: min(360px, 94vw);
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.auth-head h1 {
  margin: 0 0 6px;
  font-size: 1.1rem;
  font-weight: 600;
}

.auth-subtitle {
  margin: 0 0 16px;
  color: #6b7280;
  font-size: 0.88rem;
}

.auth-form {
  display: grid;
  gap: 10px;
}

.auth-form label {
  font-size: 0.82rem;
  color: #4b5563;
}

.auth-input {
  border: 1px solid #d1d5db;
  border-radius: 6px;
  background: #fff;
  padding: 0 10px;
}

.auth-input:focus-within {
  border-color: #2563eb;
}

.auth-input input {
  width: 100%;
  padding: 10px 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: #111827;
  font: inherit;
}

button[type="submit"] {
  margin-top: 4px;
  border: 1px solid #2563eb;
  border-radius: 6px;
  padding: 10px 12px;
  font: inherit;
  font-weight: 600;
  color: #ffffff;
  background: #2563eb;
  cursor: pointer;
}

button[type="submit"]:hover {
  background: #1d4ed8;
}

button[type="submit"]:disabled {
  opacity: 0.7;
  cursor: progress;
}

.auth-error {
  margin: 12px 0 0;
  color: #b91c1c;
  background: #fee2e2;
  border: 1px solid #fecaca;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 0.85rem;
}