:root {
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --text-color: #374151;
  --border-color: #e5e7eb;
  --error-color: #ef4444;
  --background-color: #f3f4f6;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  background-color: var(--background-color);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.container {
  background: white;
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  width: 100%;
  max-width: 28rem;
}

.logo {
  text-align: center;
  margin-bottom: 2rem;
}

.logo h1 {
  color: var(--primary-color);
  font-size: clamp(1.875rem, 5vw, 2.5rem);
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.logo p {
  color: var(--text-color);
  opacity: 0.8;
  font-size: clamp(0.875rem, 2vw, 1rem);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  color: var(--text-color);
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group input[type="submit"] {
  background-color: var(--primary-color);
  color: white;
  font-weight: 500;
  cursor: pointer;
  padding: 0.75rem 1.5rem;
  border: none;
  transition: background-color 0.2s;
}

.form-group input[type="submit"]:hover {
  background-color: var(--primary-hover);
}

.error {
  background-color: #fef2f2;
  color: var(--error-color);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  text-align: center;
}

.divider {
  display: flex;
  align-items: center;
  margin: 1.5rem 0;
  gap: 1rem;
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}

.divider span {
  color: var(--text-color);
  opacity: 0.5;
  font-size: 0.875rem;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--primary-hover);
}

/* Responsive adjustments */
@media (max-width: 640px) {
  .container {
    padding: 1.5rem;
    margin: 1rem;
  }

  .form-group {
    margin-bottom: 1rem;
  }

  .form-group input {
    padding: 0.625rem 0.875rem;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #1f2937;
    --text-color: #e5e7eb;
    --border-color: #374151;
  }

  .container {
    background: #111827;
  }

  .form-group input {
    background-color: #1f2937;
    color: #e5e7eb;
  }

  .error {
    background-color: #7f1d1d;
    color: #fca5a5;
  }
}