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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-card {
  background: white;
  border-radius: 16px;
  padding: 48px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  text-align: center;
}

.auth-card .logo-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
  display: block;
}

.auth-card h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #1e293b;
}

.auth-card h1 span {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.auth-card .subtitle {
  color: #64748b;
  margin-bottom: 32px;
  font-size: 14px;
}

.form-group {
  margin-bottom: 20px;
  text-align: left;
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 8px;
  font-size: 14px;
  color: #1e293b;
}

.form-input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid #e2e8f0;
  border-radius: 10px;
  font-size: 15px;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
  outline: none;
}

.form-input:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: none;
  width: 100%;
  transition: all 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.alert {
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 20px;
  display: none;
  text-align: left;
}

.alert-error {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.switch-link {
  margin-top: 24px;
  font-size: 14px;
  color: #64748b;
}

.switch-link a {
  color: #6366f1;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
}

.switch-link a:hover {
  text-decoration: underline;
}

#registerFields {
  display: none;
}

.footer-text {
  margin-top: 24px;
  color: #94a3b8;
  font-size: 12px;
}

@media (max-width: 480px) {
  .auth-card {
    padding: 32px 24px;
  }
}