/* App Header */
.app-header {
  background: var(--color-background);
  border-bottom: none;
  padding: var(--spacing-lg) 0;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-2xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.app-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
}

.app-logo .logo-icon {
  width: 24px;
  height: 29px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

/* Action Buttons */
.signup-btn,
.modeling-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
  text-decoration: none;
  cursor: pointer;
}

.signup-btn {
  background: #1a73e8;
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: background-color var(--transition-base);
  text-decoration: none;
  margin-right: var(--spacing-md);
}

.signup-btn:hover {
  background: #3367d6;
}

.modeling-btn {
  background: var(--color-primary);
  color: var(--color-surface);
  border: none;
}

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

/* User Info */
.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.user-email {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.user-email-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.user-email-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.user-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-border);
}