:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --bg-color: #f3f4f6;
  --card-bg: #ffffff;
  --text-dark: #111827;
  --text-light: #6b7280;
  --border: #e5e7eb;
  --error: #ef4444;
  --success: #10b981;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-dark);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.auth-container {
  background: var(--card-bg);
  border-radius: 1rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 480px;
  padding: 2.5rem;
  animation: fadeIn 0.4s ease-out;
}

.auth-container.register-wide {
  max-width: 800px;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

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

.auth-header h1 {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
}

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

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

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

input[type="text"],
input[type="number"],
input[type="password"],
textarea,
select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font-size: 1rem;
  transition: all 0.2s;
  background-color: transparent;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  padding: 0.875rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
}

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

.btn:active {
  transform: scale(0.98);
}

.auth-links {
  margin-top: 1.5rem;
  text-align: center;
  font-size: 0.875rem;
}

.auth-links a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.auth-links a:hover {
  text-decoration: underline;
}

.message {
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  display: none;
  font-size: 0.875rem;
}

.message.success {
  display: block;
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 1px solid var(--success);
}

.message.error {
  display: block;
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 1px solid var(--error);
}

.spinner {
  display: none;
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid white;
  border-bottom-color: transparent;
  border-radius: 50%;
  animation: rotation 1s linear infinite;
  margin-right: 0.5rem;
}

.btn.loading .spinner {
  display: inline-block;
}

@keyframes rotation {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}