:root {
  --bg: #fafafa;
  --text-main: #111827;
  --text-muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e5e7eb;
  --card-bg: #ffffff;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text-main);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 3rem 1rem;
  min-height: 100vh;
  line-height: 1.5;
}

.container {
  background: var(--card-bg);
  width: 100%;
  max-width: 850px;
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--border);
}

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

.header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.025em;
}

.header p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

input[type="email"],
input[type="text"],
input[type="password"],
select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.15s ease-in-out;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s ease-in-out;
  text-align: center;
  text-decoration: none;
}

.btn:hover {
  background-color: var(--accent-hover);
}

.message {
  padding: 1rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  font-size: 0.875rem;
  text-align: center;
}

.message.success {
  background-color: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.message.error {
  background-color: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.method-section {
  display: none;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
}

.method-section.active {
  display: block;
}

.logout-link {
  display: block;
  text-align: center;
  margin-top: 1.5rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
}

.logout-link:hover {
  text-decoration: underline;
}